如何修复此错误：未定义对`u imp_InternetOpenA'； #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 我想让C++程序把发送的.txt文件带到我的PC机上。我在网上搜索这么多，但找不到方法。当我使用DEV C++时，会给我这样的错误： …：未定义对的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：未定义对\u imp\u InternetConnectA'的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对的未定义引用\uuu imp\u FtpPutFileA' #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对\uu imp\u HttpOpenRequestA'的未定义引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 下面是我找到的三个示例，但都返回了这个错误 <pre> #include <windows.h> #include <wininet.h> #include <iostream> #include <stdio.h> #include <tchar.h> #pragma comment(lib,"wininet.lib") #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables char filename[] = "file"; //Filename to be loaded char filepath[] = "d:\\a.jpg"; //Filename to be loaded char type[] = "image/jpeg"; char boundary[] = "--BOUNDARY---"; //Header boundary char nameForm[] = "formname"; //Input form name char iaddr[] = "localhost"; //IP address char url[] = "/http/file.php"; //URL char hdrs[512]={'-'}; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filepath , "rb" ); if (pFile==NULL) { printf("ERROR_OPEN_FILE"); getchar(); return ERROR_OPEN_FILE; } printf("OPEN_FILE\n"); // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) { printf("ERROR_MEMORY"); getchar(); return ERROR_OPEN_FILE; } printf("MEMORY_ALLOCATED\t \"%d\" \n",&lSize); // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) { printf("ERROR_SIZE"); getchar(); return ERROR_OPEN_FILE; } printf("SIZE_OK\n"); // terminate fclose (pFile); printf("FILE_CLOSE\n"); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"% ---------- s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n",buffer,type); sprintf(buffer,"%s%s",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WINDOWS",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) { printf("ERROR_INTERNET_OPEN"); getchar(); return ERROR_OPEN_FILE; } printf("INTERNET_OPENED\n"); HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) { printf("ERROR_INTERNET_CONN"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_CONNECTED\n"); HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",_T(url),NULL, NULL, NULL,INTERNET_FLAG_RELOAD, 1); if(hRequest==NULL) { printf("ERROR_INTERNET_REQ"); getchar(); } printf("INTERNET_REQ_OPEN\n"); BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) { printf("ERROR_INTERNET_SEND"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_SEND_OK\n"); //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); getchar(); return 0; } #包括 #包括 #包括 #包括 #包括 #pragma注释（lib，“wininet.lib”） #定义错误\u打开\u文件10 #定义错误\u存储器11 #定义错误\u大小12 #定义错误\u互联网\u打开13 #定义错误\u互联网\u连接14 #定义错误\u互联网\u请求15 #定义错误\u INTERNET\u发送16 使用名称空间std； int main（） { //局部变量 char filename[]=“file”；//要加载的文件名 char filepath[]=“d:\\a.jpg”；//要加载的文件名字符类型[]=“图像/jpeg”；字符边界[]=“--boundary----”；//头边界 char nameForm[]=“formname”；//输入表单名称 char iaddr[]=“localhost”；//IP地址字符url[]=“/http/file.php”；//url char hdrs[512]={'-'}；//头 char*buffer；//包含文件+头的缓冲区 char*content；//包含文件的缓冲区 FILE*pFile；//文件指针 long lSize；//文件大小结果的大小； //打开文件 pFile=fopen（文件路径，“rb”）； if（pFile==NULL） { printf（“错误打开文件”）； getchar（）；返回错误\u打开\u文件； } printf（“打开文件”）； //获取文件大小： fseek（pFile，0，SEEK_END）； lSize=ftell（pFile）；倒带（pFile）； //分配内存以包含整个文件：内容=（char*）malloc（sizeof（char）*lSize）； if（content==NULL） { printf（“错误存储”）； getchar（）；返回错误\u打开\u文件； } printf（“内存分配\t\%d\”\n“，&lSize）； //将文件复制到缓冲区：结果=fread（内容，1，lSize，pFile）；如果（结果！=lSize） { printf（“错误大小”）； getchar（）；返回错误\u打开\u文件； } printf（“大小\u正常\n”）； //终止 fclose（pFile）； printf（“文件关闭”）； //分配内存以包含整个文件+头缓冲区=（char*）malloc（sizeof（char）*lSize+2048）； //打印页眉 sprintf（hdrs，“内容类型：多部分/表单数据；边界=%s”，边界）； sprintf（缓冲区，“%s\r\n内容处置：表单数据；名称=\%s\”文件名=\”% ---------- s \“\r\n”，边界，名称形式，文件名）； sprintf（缓冲区，“%s内容类型：%s\r\n”，缓冲区，类型）； sprintf（缓冲区，“%s%s”，缓冲区，内容）； sprintf（缓冲区，“%s-->s-->\r\n”，缓冲区，边界）； //开放互联网连接 HINTERNET hSession=InternetOpen（“WINDOWS”，INTERNET\u OPEN\u TYPE\u Prefig，NULL，NULL，0）； if（hsSession==NULL） { printf（“错误互联网开放”）； getchar（）；返回错误\u打开\u文件； } printf（“互联网已打开”）； HINTERNET hConnect=InternetConnect（会话、iaddr、INTERNET\u默认\u HTTP\u端口、NULL、NULL、INTERNET\u服务\u HTTP、0、1）；如果（hConnect==NULL） { printf（“网络连接错误”）； getchar（）；返回错误\u互联网\u连接； } printf（“已连接互联网”）； HINTERNET hRequest=HttpOpenRequest（hConnect，（const char*）“POST”、_T（url）、NULL、NULL、NULL、INTERNET_标志_重载，1）；如果（hRequest==NULL） { printf（“错误互联网请求”）； getchar（）； } printf（“互联网请求打开”）； BOOL sent=HttpSendRequest（hRequest、hdrs、strlen（hdrs）、buffer、strlen（buffer））；如果（！已发送） { printf（“错误互联网发送”）； getchar（）；返回错误\u互联网\u连接； } printf（“互联网发送”确认\n）； //关闭所有有效的internet句柄 InternetCloseHandle（hsSession）； InternetCloseHandle（hConnect）； InternetCloseHandle（hRequest）； getchar（）；返回0； }_C++_Ftp_Send_Transfer_Wininet

cplusplus/
如何修复此错误：未定义对`u imp_InternetOpenA'； #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 我想让C++程序把发送的.txt文件带到我的PC机上。我在网上搜索这么多，但找不到方法。当我使用DEV C++时，会给我这样的错误： …：未定义对的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：未定义对\u imp\u InternetConnectA'的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对的未定义引用\uuu imp\u FtpPutFileA' #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对\uu imp\u HttpOpenRequestA'的未定义引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 下面是我找到的三个示例，但都返回了这个错误 <pre> #include <windows.h> #include <wininet.h> #include <iostream> #include <stdio.h> #include <tchar.h> #pragma comment(lib,"wininet.lib") #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables char filename[] = "file"; //Filename to be loaded char filepath[] = "d:\\a.jpg"; //Filename to be loaded char type[] = "image/jpeg"; char boundary[] = "--BOUNDARY---"; //Header boundary char nameForm[] = "formname"; //Input form name char iaddr[] = "localhost"; //IP address char url[] = "/http/file.php"; //URL char hdrs[512]={'-'}; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filepath , "rb" ); if (pFile==NULL) { printf("ERROR_OPEN_FILE"); getchar(); return ERROR_OPEN_FILE; } printf("OPEN_FILE\n"); // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) { printf("ERROR_MEMORY"); getchar(); return ERROR_OPEN_FILE; } printf("MEMORY_ALLOCATED\t \"%d\" \n",&lSize); // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) { printf("ERROR_SIZE"); getchar(); return ERROR_OPEN_FILE; } printf("SIZE_OK\n"); // terminate fclose (pFile); printf("FILE_CLOSE\n"); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"% ---------- s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n",buffer,type); sprintf(buffer,"%s%s",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WINDOWS",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) { printf("ERROR_INTERNET_OPEN"); getchar(); return ERROR_OPEN_FILE; } printf("INTERNET_OPENED\n"); HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) { printf("ERROR_INTERNET_CONN"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_CONNECTED\n"); HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",_T(url),NULL, NULL, NULL,INTERNET_FLAG_RELOAD, 1); if(hRequest==NULL) { printf("ERROR_INTERNET_REQ"); getchar(); } printf("INTERNET_REQ_OPEN\n"); BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) { printf("ERROR_INTERNET_SEND"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_SEND_OK\n"); //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); getchar(); return 0; } #包括 #包括 #包括 #包括 #包括 #pragma注释（lib，“wininet.lib”） #定义错误\u打开\u文件10 #定义错误\u存储器11 #定义错误\u大小12 #定义错误\u互联网\u打开13 #定义错误\u互联网\u连接14 #定义错误\u互联网\u请求15 #定义错误\u INTERNET\u发送16 使用名称空间std； int main（） { //局部变量 char filename[]=“file”；//要加载的文件名 char filepath[]=“d:\\a.jpg”；//要加载的文件名字符类型[]=“图像/jpeg”；字符边界[]=“--boundary----”；//头边界 char nameForm[]=“formname”；//输入表单名称 char iaddr[]=“localhost”；//IP地址字符url[]=“/http/file.php”；//url char hdrs[512]={'-'}；//头 char*buffer；//包含文件+头的缓冲区 char*content；//包含文件的缓冲区 FILE*pFile；//文件指针 long lSize；//文件大小结果的大小； //打开文件 pFile=fopen（文件路径，“rb”）； if（pFile==NULL） { printf（“错误打开文件”）； getchar（）；返回错误\u打开\u文件； } printf（“打开文件”）； //获取文件大小： fseek（pFile，0，SEEK_END）； lSize=ftell（pFile）；倒带（pFile）； //分配内存以包含整个文件：内容=（char*）malloc（sizeof（char）*lSize）； if（content==NULL） { printf（“错误存储”）； getchar（）；返回错误\u打开\u文件； } printf（“内存分配\t\%d\”\n“，&lSize）； //将文件复制到缓冲区：结果=fread（内容，1，lSize，pFile）；如果（结果！=lSize） { printf（“错误大小”）； getchar（）；返回错误\u打开\u文件； } printf（“大小\u正常\n”）； //终止 fclose（pFile）； printf（“文件关闭”）； //分配内存以包含整个文件+头缓冲区=（char*）malloc（sizeof（char）*lSize+2048）； //打印页眉 sprintf（hdrs，“内容类型：多部分/表单数据；边界=%s”，边界）； sprintf（缓冲区，“%s\r\n内容处置：表单数据；名称=\%s\”文件名=\”% ---------- s \“\r\n”，边界，名称形式，文件名）； sprintf（缓冲区，“%s内容类型：%s\r\n”，缓冲区，类型）； sprintf（缓冲区，“%s%s”，缓冲区，内容）； sprintf（缓冲区，“%s-->s-->\r\n”，缓冲区，边界）； //开放互联网连接 HINTERNET hSession=InternetOpen（“WINDOWS”，INTERNET\u OPEN\u TYPE\u Prefig，NULL，NULL，0）； if（hsSession==NULL） { printf（“错误互联网开放”）； getchar（）；返回错误\u打开\u文件； } printf（“互联网已打开”）； HINTERNET hConnect=InternetConnect（会话、iaddr、INTERNET\u默认\u HTTP\u端口、NULL、NULL、INTERNET\u服务\u HTTP、0、1）；如果（hConnect==NULL） { printf（“网络连接错误”）； getchar（）；返回错误\u互联网\u连接； } printf（“已连接互联网”）； HINTERNET hRequest=HttpOpenRequest（hConnect，（const char*）“POST”、_T（url）、NULL、NULL、NULL、INTERNET_标志_重载，1）；如果（hRequest==NULL） { printf（“错误互联网请求”）； getchar（）； } printf（“互联网请求打开”）； BOOL sent=HttpSendRequest（hRequest、hdrs、strlen（hdrs）、buffer、strlen（buffer））；如果（！已发送） { printf（“错误互联网发送”）； getchar（）；返回错误\u互联网\u连接； } printf（“互联网发送”确认\n）； //关闭所有有效的internet句柄 InternetCloseHandle（hsSession）； InternetCloseHandle（hConnect）； InternetCloseHandle（hRequest）； getchar（）；返回0； }

如何修复此错误：未定义对`u imp_InternetOpenA'； #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 我想让C++程序把发送的.txt文件带到我的PC机上。我在网上搜索这么多，但找不到方法。当我使用DEV C++时，会给我这样的错误： …：未定义对的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：未定义对\u imp\u InternetConnectA'的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对的未定义引用\uuu imp\u FtpPutFileA' #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对\uu imp\u HttpOpenRequestA'的未定义引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 下面是我找到的三个示例，但都返回了这个错误 <pre> #include <windows.h> #include <wininet.h> #include <iostream> #include <stdio.h> #include <tchar.h> #pragma comment(lib,"wininet.lib") #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables char filename[] = "file"; //Filename to be loaded char filepath[] = "d:\\a.jpg"; //Filename to be loaded char type[] = "image/jpeg"; char boundary[] = "--BOUNDARY---"; //Header boundary char nameForm[] = "formname"; //Input form name char iaddr[] = "localhost"; //IP address char url[] = "/http/file.php"; //URL char hdrs[512]={'-'}; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filepath , "rb" ); if (pFile==NULL) { printf("ERROR_OPEN_FILE"); getchar(); return ERROR_OPEN_FILE; } printf("OPEN_FILE\n"); // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) { printf("ERROR_MEMORY"); getchar(); return ERROR_OPEN_FILE; } printf("MEMORY_ALLOCATED\t \"%d\" \n",&lSize); // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) { printf("ERROR_SIZE"); getchar(); return ERROR_OPEN_FILE; } printf("SIZE_OK\n"); // terminate fclose (pFile); printf("FILE_CLOSE\n"); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"% ---------- s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n",buffer,type); sprintf(buffer,"%s%s",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WINDOWS",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) { printf("ERROR_INTERNET_OPEN"); getchar(); return ERROR_OPEN_FILE; } printf("INTERNET_OPENED\n"); HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) { printf("ERROR_INTERNET_CONN"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_CONNECTED\n"); HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",_T(url),NULL, NULL, NULL,INTERNET_FLAG_RELOAD, 1); if(hRequest==NULL) { printf("ERROR_INTERNET_REQ"); getchar(); } printf("INTERNET_REQ_OPEN\n"); BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) { printf("ERROR_INTERNET_SEND"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_SEND_OK\n"); //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); getchar(); return 0; } #包括 #包括 #包括 #包括 #包括 #pragma注释（lib，“wininet.lib”） #定义错误\u打开\u文件10 #定义错误\u存储器11 #定义错误\u大小12 #定义错误\u互联网\u打开13 #定义错误\u互联网\u连接14 #定义错误\u互联网\u请求15 #定义错误\u INTERNET\u发送16 使用名称空间std； int main（） { //局部变量 char filename[]=“file”；//要加载的文件名 char filepath[]=“d:\\a.jpg”；//要加载的文件名字符类型[]=“图像/jpeg”；字符边界[]=“--boundary----”；//头边界 char nameForm[]=“formname”；//输入表单名称 char iaddr[]=“localhost”；//IP地址字符url[]=“/http/file.php”；//url char hdrs[512]={'-'}；//头 char*buffer；//包含文件+头的缓冲区 char*content；//包含文件的缓冲区 FILE*pFile；//文件指针 long lSize；//文件大小结果的大小； //打开文件 pFile=fopen（文件路径，“rb”）； if（pFile==NULL） { printf（“错误打开文件”）； getchar（）；返回错误\u打开\u文件； } printf（“打开文件”）； //获取文件大小： fseek（pFile，0，SEEK_END）； lSize=ftell（pFile）；倒带（pFile）； //分配内存以包含整个文件：内容=（char*）malloc（sizeof（char）*lSize）； if（content==NULL） { printf（“错误存储”）； getchar（）；返回错误\u打开\u文件； } printf（“内存分配\t\%d\”\n“，&lSize）； //将文件复制到缓冲区：结果=fread（内容，1，lSize，pFile）；如果（结果！=lSize） { printf（“错误大小”）； getchar（）；返回错误\u打开\u文件； } printf（“大小\u正常\n”）； //终止 fclose（pFile）； printf（“文件关闭”）； //分配内存以包含整个文件+头缓冲区=（char*）malloc（sizeof（char）*lSize+2048）； //打印页眉 sprintf（hdrs，“内容类型：多部分/表单数据；边界=%s”，边界）； sprintf（缓冲区，“%s\r\n内容处置：表单数据；名称=\%s\”文件名=\”% ---------- s \“\r\n”，边界，名称形式，文件名）； sprintf（缓冲区，“%s内容类型：%s\r\n”，缓冲区，类型）； sprintf（缓冲区，“%s%s”，缓冲区，内容）； sprintf（缓冲区，“%s-->s-->\r\n”，缓冲区，边界）； //开放互联网连接 HINTERNET hSession=InternetOpen（“WINDOWS”，INTERNET\u OPEN\u TYPE\u Prefig，NULL，NULL，0）； if（hsSession==NULL） { printf（“错误互联网开放”）； getchar（）；返回错误\u打开\u文件； } printf（“互联网已打开”）； HINTERNET hConnect=InternetConnect（会话、iaddr、INTERNET\u默认\u HTTP\u端口、NULL、NULL、INTERNET\u服务\u HTTP、0、1）；如果（hConnect==NULL） { printf（“网络连接错误”）； getchar（）；返回错误\u互联网\u连接； } printf（“已连接互联网”）； HINTERNET hRequest=HttpOpenRequest（hConnect，（const char*）“POST”、_T（url）、NULL、NULL、NULL、INTERNET_标志_重载，1）；如果（hRequest==NULL） { printf（“错误互联网请求”）； getchar（）； } printf（“互联网请求打开”）； BOOL sent=HttpSendRequest（hRequest、hdrs、strlen（hdrs）、buffer、strlen（buffer））；如果（！已发送） { printf（“错误互联网发送”）； getchar（）；返回错误\u互联网\u连接； } printf（“互联网发送”确认\n）； //关闭所有有效的internet句柄 InternetCloseHandle（hsSession）； InternetCloseHandle（hConnect）； InternetCloseHandle（hRequest）； getchar（）；返回0； }

c++ ftp

如何修复此错误：未定义对`u imp_InternetOpenA'； #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 我想让C++程序把发送的.txt文件带到我的PC机上。我在网上搜索这么多，但找不到方法。当我使用DEV C++时，会给我这样的错误： …：未定义对的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：未定义对\u imp\u InternetConnectA'的引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对的未定义引用\uuu imp\u FtpPutFileA' #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> …：对\uu imp\u HttpOpenRequestA'的未定义引用 #include <windows.h> #include <wininet.h> #include <stdio.h> #include <iostream> #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables static char filename[] = "test.txt"; //Filename to be loaded static char type[] = "image/jpg"; static char boundary[] = "pippo"; //Header boundary static char nameForm[] = "uploadedfile"; //Input form name static char iaddr[] = "localhost"; //IP address static char url[] = "test.php"; //URL char hdrs[255]; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filename , "rb" ); if (pFile==NULL) return ERROR_OPEN_FILE; // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) return ERROR_MEMORY; // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) return ERROR_SIZE; // terminate fclose (pFile); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n\r\n",buffer,type); sprintf(buffer,"%s%s\r\n",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WinSock",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) return ERROR_INTERNET_OPEN; HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) return ERROR_INTERNET_CONN; HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",url, NULL, NULL, (const char**)"*/*\0", 0, 1); if(hRequest==NULL) return ERROR_INTERNET_REQ; BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) return ERROR_INTERNET_SEND; //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); return 0; } </pre> 下面是我找到的三个示例，但都返回了这个错误 <pre> #include <windows.h> #include <wininet.h> #include <iostream> #include <stdio.h> #include <tchar.h> #pragma comment(lib,"wininet.lib") #define ERROR_OPEN_FILE 10 #define ERROR_MEMORY 11 #define ERROR_SIZE 12 #define ERROR_INTERNET_OPEN 13 #define ERROR_INTERNET_CONN 14 #define ERROR_INTERNET_REQ 15 #define ERROR_INTERNET_SEND 16 using namespace std; int main() { // Local variables char filename[] = "file"; //Filename to be loaded char filepath[] = "d:\\a.jpg"; //Filename to be loaded char type[] = "image/jpeg"; char boundary[] = "--BOUNDARY---"; //Header boundary char nameForm[] = "formname"; //Input form name char iaddr[] = "localhost"; //IP address char url[] = "/http/file.php"; //URL char hdrs[512]={'-'}; //Headers char * buffer; //Buffer containing file + headers char * content; //Buffer containing file FILE * pFile; //File pointer long lSize; //File size size_t result; // Open file pFile = fopen ( filepath , "rb" ); if (pFile==NULL) { printf("ERROR_OPEN_FILE"); getchar(); return ERROR_OPEN_FILE; } printf("OPEN_FILE\n"); // obtain file size: fseek (pFile , 0 , SEEK_END); lSize = ftell (pFile); rewind (pFile); // allocate memory to contain the whole file: content = (char*) malloc (sizeof(char)*lSize); if (content == NULL) { printf("ERROR_MEMORY"); getchar(); return ERROR_OPEN_FILE; } printf("MEMORY_ALLOCATED\t \"%d\" \n",&lSize); // copy the file into the buffer: result = fread (content,1,lSize,pFile); if (result != lSize) { printf("ERROR_SIZE"); getchar(); return ERROR_OPEN_FILE; } printf("SIZE_OK\n"); // terminate fclose (pFile); printf("FILE_CLOSE\n"); //allocate memory to contain the whole file + HEADER buffer = (char*) malloc (sizeof(char)*lSize + 2048); //print header sprintf(hdrs,"Content-Type: multipart/form-data; boundary=%s",boundary); sprintf(buffer,"%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"% ---------- s\"\r\n",boundary,nameForm,filename); sprintf(buffer,"%sContent-Type: %s\r\n",buffer,type); sprintf(buffer,"%s%s",buffer,content); sprintf(buffer,"%s--%s--\r\n",buffer,boundary); //Open internet connection HINTERNET hSession = InternetOpen("WINDOWS",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0); if(hSession==NULL) { printf("ERROR_INTERNET_OPEN"); getchar(); return ERROR_OPEN_FILE; } printf("INTERNET_OPENED\n"); HINTERNET hConnect = InternetConnect(hSession, iaddr,INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1); if(hConnect==NULL) { printf("ERROR_INTERNET_CONN"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_CONNECTED\n"); HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST",_T(url),NULL, NULL, NULL,INTERNET_FLAG_RELOAD, 1); if(hRequest==NULL) { printf("ERROR_INTERNET_REQ"); getchar(); } printf("INTERNET_REQ_OPEN\n"); BOOL sent= HttpSendRequest(hRequest, hdrs, strlen(hdrs), buffer, strlen(buffer)); if(!sent) { printf("ERROR_INTERNET_SEND"); getchar(); return ERROR_INTERNET_CONN; } printf("INTERNET_SEND_OK\n"); //close any valid internet-handles InternetCloseHandle(hSession); InternetCloseHandle(hConnect); InternetCloseHandle(hRequest); getchar(); return 0; } #包括 #包括 #包括 #包括 #包括 #pragma注释（lib，“wininet.lib”） #定义错误\u打开\u文件10 #定义错误\u存储器11 #定义错误\u大小12 #定义错误\u互联网\u打开13 #定义错误\u互联网\u连接14 #定义错误\u互联网\u请求15 #定义错误\u INTERNET\u发送16 使用名称空间std； int main（） { //局部变量 char filename[]=“file”；//要加载的文件名 char filepath[]=“d:\\a.jpg”；//要加载的文件名字符类型[]=“图像/jpeg”；字符边界[]=“--boundary----”；//头边界 char nameForm[]=“formname”；//输入表单名称 char iaddr[]=“localhost”；//IP地址字符url[]=“/http/file.php”；//url char hdrs[512]={'-'}；//头 char*buffer；//包含文件+头的缓冲区 char*content；//包含文件的缓冲区 FILE*pFile；//文件指针 long lSize；//文件大小结果的大小； //打开文件 pFile=fopen（文件路径，“rb”）； if（pFile==NULL） { printf（“错误打开文件”）； getchar（）；返回错误\u打开\u文件； } printf（“打开文件”）； //获取文件大小： fseek（pFile，0，SEEK_END）； lSize=ftell（pFile）；倒带（pFile）； //分配内存以包含整个文件：内容=（char*）malloc（sizeof（char）*lSize）； if（content==NULL） { printf（“错误存储”）； getchar（）；返回错误\u打开\u文件； } printf（“内存分配\t\%d\”\n“，&lSize）； //将文件复制到缓冲区：结果=fread（内容，1，lSize，pFile）；如果（结果！=lSize） { printf（“错误大小”）； getchar（）；返回错误\u打开\u文件； } printf（“大小\u正常\n”）； //终止 fclose（pFile）； printf（“文件关闭”）； //分配内存以包含整个文件+头缓冲区=（char*）malloc（sizeof（char）*lSize+2048）； //打印页眉 sprintf（hdrs，“内容类型：多部分/表单数据；边界=%s”，边界）； sprintf（缓冲区，“%s\r\n内容处置：表单数据；名称=\%s\”文件名=\”% ---------- s \“\r\n”，边界，名称形式，文件名）； sprintf（缓冲区，“%s内容类型：%s\r\n”，缓冲区，类型）； sprintf（缓冲区，“%s%s”，缓冲区，内容）； sprintf（缓冲区，“%s-->s-->\r\n”，缓冲区，边界）； //开放互联网连接 HINTERNET hSession=InternetOpen（“WINDOWS”，INTERNET\u OPEN\u TYPE\u Prefig，NULL，NULL，0）； if（hsSession==NULL） { printf（“错误互联网开放”）； getchar（）；返回错误\u打开\u文件； } printf（“互联网已打开”）； HINTERNET hConnect=InternetConnect（会话、iaddr、INTERNET\u默认\u HTTP\u端口、NULL、NULL、INTERNET\u服务\u HTTP、0、1）；如果（hConnect==NULL） { printf（“网络连接错误”）； getchar（）；返回错误\u互联网\u连接； } printf（“已连接互联网”）； HINTERNET hRequest=HttpOpenRequest（hConnect，（const char*）“POST”、_T（url）、NULL、NULL、NULL、INTERNET_标志_重载，1）；如果（hRequest==NULL） { printf（“错误互联网请求”）； getchar（）； } printf（“互联网请求打开”）； BOOL sent=HttpSendRequest（hRequest、hdrs、strlen（hdrs）、buffer、strlen（buffer））；如果（！已发送） { printf（“错误互联网发送”）； getchar（）；返回错误\u互联网\u连接； } printf（“互联网发送”确认\n）； //关闭所有有效的internet句柄 InternetCloseHandle（hsSession）； InternetCloseHandle（hConnect）； InternetCloseHandle（hRequest）； getchar（）；返回0； },c++,ftp,send,transfer,wininet,C++,Ftp,Send,Transfer,Wininet,#包括 #包括 #包括 #包括 #包括 #包括 //#pragma注释（lib，“wininet.lib”）使用名称空间std； int main（） { 静态TCHAR frmdata[]=“-------------------------------------7d82751e2bc0858\n内容处理：表单数据；名称=\“uploadedfile\”；文件名=\“C:\test.txt\”\n内容类型：text/plain\n\n此处文件内容\n--------------------


#包括
#包括
#包括
#包括
#包括
#包括
//#pragma注释（lib，“wininet.lib”）
使用名称空间std；
int main（）
{
静态TCHAR frmdata[]=“-------------------------------------7d82751e2bc0858\n内容处理：表单数据；名称=\“uploadedfile\”；文件名=\“C:\test.txt\”\n内容类型：text/plain\n\n此处文件内容\n----------------------------7d82751e2bc0858-”；
静态TCHAR hdrs[]=“内容类型：多部分/表单数据；边界=------------------------------------7d82751e2bc0858”；
HINTERNET hSession=互联网开放（“MyAgent”，互联网开放类型，空，空，0）；
if（hsSession==NULL）
{
CUT我在第一个C++程序中有很多这样的错误。这是一个与WiNeNET库链接的问题。如果你使用的是明文添加“-LWInIt”（没有引号）如果使用VC++，我不知道该怎么办。另外，请确保WinINet库的位置位于链接器的搜索路径中。
使用CMake，您只需要

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