C++ 为什么在c++；？

我有下面的代码，但nginx给我500。我不知道为什么，请帮助我

标题在这里

我找不到任何错误。有人遇到过吗

POST http://sss.com/ HTTP/1.1
Host: sss.com
Connection: keep-alive
Content-Length: 241047
Cache-Control: max-age=0
Origin: http://sss.com
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/15.0.849.0 Safari/535.1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarybZRmyZBq9p09AotO
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Referer: http://sss.com/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: zh-CN,zh;q=0.8
Cookie: PHPSESSID=krje6jlnls57ejc0p4jqhkd2k7

------WebKitFormBoundarybZRmyZBq9p09AotO
Content-Disposition: form-data; name="type"


4
------WebKitFormBoundarybZRmyZBq9p09AotO
Content-Disposition: form-data; name="upfile"; filename="/home/heida/test/1152_648.png"
Content-Type: application/octet-stream



------WebKitFormBoundarybZRmyZBq9p09AotO--

nginx给我的结果如下：

代码如下：

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <iostream>
#include <string.h>
#include <netdb.h>
#include <cerrno>

using namespace std;

std::string get_file_contents(const char *filename)
{
  std::FILE *fp = std::fopen(filename, "rb");
  if (fp)
  {
    std::string contents;
    std::fseek(fp, 0, SEEK_END);
    contents.resize(std::ftell(fp));
    std::rewind(fp);
    std::fread(&contents[0], 1, contents.size(), fp);
    std::fclose(fp);
    return(contents);
  }
  throw(errno);
}

int request(char* hostname, char* api,string & content)
{

    //socket
    struct hostent* host_addr = gethostbyname(hostname);
    if (host_addr == NULL)
    {
        cout<<"Unable to locate host"<<endl;
        return -103;
    }


    sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons((unsigned short)80);
    sin.sin_addr=  *((struct in_addr *)host_addr->h_addr);
    bzero(&(sin.sin_zero),8);

    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == -1)
    {
        return -100;
    }


    if (connect(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr) ) == -1)
    {
        cout<<"connect failed"<<endl;
        return -101;
    }



    char send_str[2048] = {0};



    strcat(send_str, "POST ");
    strcat(send_str, api);
    strcat(send_str, " HTTP/1.1\r\n");
    strcat(send_str, "Host: ");
    strcat(send_str, hostname);
    strcat(send_str, "\r\n");
    strcat(send_str, "Connection: keep-alive\r\n");


    char content_header[100];
    sprintf(content_header,"Content-Length: %d\r\n", content.size());


    strcat(send_str, content_header);
    strcat(send_str, "Cache-Control: max-age=0\r\n");
    strcat(send_str, "Origin: http://yyfs.yy.com\r\n");
    strcat(send_str, "Upgrade-Insecure-Requests: 1\r\n");
    strcat(send_str, "User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/15.0.849.0 Safari/535.1\r\n");
    strcat(send_str, "Content-Type: multipart/form-data; boundary=----WebKitFormBoundarybZRmyZBq9p09AotO\r\n");
    strcat(send_str, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n");
    strcat(send_str, "Referer: http://yyfs.yy.com/\r\n");
    strcat(send_str, "Accept-Encoding: gzip,deflate,sdch\r\n");
    strcat(send_str, "Accept-Language: zh-CN,zh;q=0.8\r\n");
    strcat(send_str,"Cookie: PHPSESSID=krje6jlnls57ejc0p4jqhkd2k7\r\n");    


    strcat(send_str, "\r\n");
    strcat(send_str,"------WebKitFormBoundarybZRmyZBq9p09AotO\r\n");
    strcat(send_str,"Content-Disposition: form-data; name=\"type\"\r\n\r\n");
    strcat(send_str, "\r\n");
    strcat(send_str, "4\r\n");
    strcat(send_str,"------WebKitFormBoundarybZRmyZBq9p09AotO\r\n");
    strcat(send_str,"Content-Disposition: form-data; name=\"upfile\"; filename=\"/home/heida/test/1152_648.png\"\r\n");
    strcat(send_str,"Content-Type: application/octet-stream\r\n\r\n");

    cout<<send_str<<endl;
    if (send(sock, send_str, strlen(send_str),0) == -1)
    {
        cout<<"send failed"<<endl;
        return -101;
    }

    if (send(sock, content.c_str(), content.size(),0) == -1)
    {

       cout<<"send failed"<<endl;
       return -1;
    }
    char ends[190] = {0};
    strcat(ends, "\r\n------WebKitFormBoundarybZRmyZBq9p09AotO--\r\n");
    cout<<ends<<endl;
    if (send(sock, ends, strlen(ends),0) == -1)
    {
      cout<<"send failed"<<endl;
      return -1;

    }



    char recv_str[4096] = {0};
    if (recv(sock, recv_str, sizeof(recv_str), 0) == -1)
    {
        cout<<"recv failed"<<endl;
        return -101;
    }


    cout<<recv_str<<endl;

    return 0;
}

int main()
{
    std::string files =  get_file_contents("1152_648.png");
    cout<<files.size()<<endl;
    request("sss.com","http://ssy.com/",files);



    return 0;
}

#包括
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#包括
使用名称空间std；
字符串获取文件内容（常量字符*文件名）
{
std:：FILE*fp=std:：fopen（文件名，“rb”）；
if（fp）
{
std：：字符串内容；
std：：fseek（fp，0，SEEK_END）；
调整大小（std：：ftell（fp））；
标准：倒带（fp）；
std:：fread（&contents[0]，1，contents.size（），fp）；
std：：fclose（fp）；
返回（内容）；
}
投掷（errno）；
}
int请求（字符*主机名、字符*api、字符串和内容）
{
//插座
结构hostent*host\u addr=gethostbyname（主机名）；
if（主机地址==NULL）
{
我找错地方了，是内容长度。
内容长度包括文件大小和小于文件大小

------WebKitFormBoundarybZRmyZBq9p09AotO
内容配置：表单数据；name=“file”；filename=“/home/heida/test/1152_648.png”
内容类型：应用程序/八位字节流

塒NG

------WebKitFormBoundarybZRmyZBq9p09AotO--

右代码：

char endsss[190] = {0};
    strcat(endsss,"------WebKitFormBoundarybZRmyZBq9p09AotO\r\n");
    strcat(endsss,"Content-Disposition: form-data; name=\"file\"; filename=\"/home/heida/test/1152_648.png\"\r\n");
    strcat(endsss,"Content-Type: application/octet-stream\r\n\r\n");

    char ends[190] = {0};
    strcat(ends, "\r\n------WebKitFormBoundarybZRmyZBq9p09AotO--\r\n");

    char content_header[100];
    sprintf(content_header,"Content-Length: %d\r\n",content.size()+strlen(endsss)+strlen(ends));

你检查过服务器日志了吗？那里发生了什么？你试过使用CURL或其他命令行程序发布吗？@Joachim Pileborg我使用其他工具，它工作正常。但我没有发现我的代码有任何错误。
char endsss[190] = {0};
    strcat(endsss,"------WebKitFormBoundarybZRmyZBq9p09AotO\r\n");
    strcat(endsss,"Content-Disposition: form-data; name=\"file\"; filename=\"/home/heida/test/1152_648.png\"\r\n");
    strcat(endsss,"Content-Type: application/octet-stream\r\n\r\n");

    char ends[190] = {0};
    strcat(ends, "\r\n------WebKitFormBoundarybZRmyZBq9p09AotO--\r\n");

    char content_header[100];
    sprintf(content_header,"Content-Length: %d\r\n",content.size()+strlen(endsss)+strlen(ends));