C++ Can';t使用winsock2.lib向客户端发送数据
我们有tcp/ip应用程序项目,在源代码中使用winsock2.lib,服务器和客户端功能如下: 服务器:C++ Can';t使用winsock2.lib向客户端发送数据,c++,sockets,C++,Sockets,我们有tcp/ip应用程序项目,在源代码中使用winsock2.lib,服务器和客户端功能如下: 服务器: #undef UNICODE #define WIN32_LEAN_AND_MEAN #include <iostream> #include<string> #include <windows.h> #include <winsock2.h> #include <ws2tcpip.h> #include <stdlib.h
#undef UNICODE
#define WIN32_LEAN_AND_MEAN
#include <iostream>
#include<string>
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
#pragma comment (lib, "Ws2_32.lib")
using namespace::std;
int server()
{
string SERVER_ADDRESS= "172.17.11.138";
int PORT_NUMBER = 27015;
sockaddr_in server;
server.sin_family=AF_INET;
server.sin_port=htons(PORT_NUMBER);
server.sin_addr.S_un.S_addr=inet_addr(&SERVER_ADDRESS[0]);
WSADATA wsaData;
int iResult;
SOCKET ListenSocket = INVALID_SOCKET;
SOCKET ClientSocket = INVALID_SOCKET;
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
int iSendResult;
char recvbuf[256];
int recvbuflen = 256;
// Create a SOCKET for connecting to server
ListenSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if (ListenSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
// Setup the TCP listening socket
iResult = bind( ListenSocket, (struct sockaddr*)&server,sizeof(server));
if (iResult == SOCKET_ERROR) {
printf("bind failed with error: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
iResult = listen(ListenSocket, SOMAXCONN);
if (iResult == SOCKET_ERROR) {
printf("listen failed with error: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
// Accept a client socket
ClientSocket = accept(ListenSocket, NULL, NULL);
if (ClientSocket == INVALID_SOCKET) {
printf("accept failed with error: %d\n", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
}
// No longer need server socket
closesocket(ListenSocket);
// Echo the buffer back to the sender
iSendResult = send( ClientSocket, recvbuf, iResult, 0 );
if (iSendResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ClientSocket);
WSACleanup();
return 1;
}
}
#未定义UNICODE
#定义WIN32_精益_和_平均值
#包括
#包括
#包括
#包括
#包括
#包括
#包括
#pragma注释(lib,“Ws2_32.lib”)
使用namespace::std;
int服务器()
{
字符串服务器地址=“172.17.11.138”;
int端口号=27015;
服务器中的sockaddr_;
server.sinu family=AF\u INET;
server.sinu port=htons(端口号);
server.sin_addr.S_un.S_addr=inet_addr(&server_addr[0]);
WSADATA WSADATA;
国际结果;
套接字ListenSocket=无效的\u套接字;
套接字ClientSocket=无效的\u套接字;
//初始化Winsock
iResult=WSAStartup(MAKEWORD(2,2)和wsaData);
如果(iResult!=0){
printf(“WSAStartup失败,错误:%d\n”,iResult);
返回1;
}
int iSendResult;
char recvbuf[256];
int recvbuflen=256;
//创建用于连接到服务器的套接字
ListenSocket=socket(AF_INET、SOCK流、IPPROTO_TCP);
if(ListenSocket==无效的_套接字){
printf(“套接字失败,错误:%ld\n”,WSAGetLastError());
WSACleanup();
返回1;
}
//设置TCP侦听套接字
iResult=bind(ListenSocket,(struct sockaddr*)&server,sizeof(server));
if(iResult==SOCKET\u错误){
printf(“绑定失败,错误:%d\n”,WSAGetLastError());
闭合插座(ListenSocket);
WSACleanup();
返回1;
}
iResult=侦听(ListenSocket,SOMAXCONN);
if(iResult==SOCKET\u错误){
printf(“侦听失败,错误为:%d\n”,WSAGetLastError());
闭合插座(ListenSocket);
WSACleanup();
返回1;
}
//接受客户端套接字
ClientSocket=accept(ListenSocket,NULL,NULL);
if(ClientSocket==无效的_SOCKET){
printf(“接受失败,错误:%d\n”,WSAGetLastError());
闭合插座(ListenSocket);
WSACleanup();
返回1;
}
//不再需要服务器套接字
闭合插座(ListenSocket);
//将缓冲区回显给发送方
iSendResult=send(ClientSocket,recvbuf,iResult,0);
if(iSendResult==套接字错误){
printf(“发送失败,错误:%d\n”,WSAGetLastError());
闭合插座(ClientSocket);
WSACleanup();
返回1;
}
}
客户:
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
int client()
{
WSADATA wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
string SERVER_ADDRESS= "172.17.11.138";
char *sendbuf = "this is a test";
char recvbuf[256];
int PORT_NUMBER = 27015;
int iResult;
sockaddr_in server;
server.sin_family=AF_INET;
server.sin_port=htons(PORT_NUMBER);
server.sin_addr.S_un.S_addr=inet_addr(&SERVER_ADDRESS[0]);
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
// Create a SOCKET for connecting to server
ConnectSocket = socket(AF_INET,SOCK_STREAM, IPPROTO_TCP);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
iResult = connect( ConnectSocket,(struct sockaddr*)&server,sizeof(server));
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
iResult = recv(ConnectSocket, recvbuf, 256, 0);
if ( iResult > 0 )
printf("Bytes received: %d\n", iResult);
else if ( iResult == 0 )
printf("Connection closed\n");
else
printf("recv failed with error: %d\n", WSAGetLastError());
}
#定义WIN32_LEAN_和_MEAN
#包括
#包括
#包括
#包括
#包括
#pragma注释(lib,“Ws2_32.lib”)
#pragma注释(lib,“Mswsock.lib”)
#pragma注释(lib,“AdvApi32.lib”)
int客户机()
{
WSADATA WSADATA;
SOCKET ConnectSocket=无效的_套接字;
字符串服务器地址=“172.17.11.138”;
char*sendbuf=“这是一个测试”;
char recvbuf[256];
int端口号=27015;
国际结果;
服务器中的sockaddr_;
server.sinu family=AF\u INET;
server.sinu port=htons(端口号);
server.sin_addr.S_un.S_addr=inet_addr(&server_addr[0]);
//初始化Winsock
iResult=WSAStartup(MAKEWORD(2,2)和wsaData);
如果(iResult!=0){
printf(“WSAStartup失败,错误:%d\n”,iResult);
返回1;
}
//创建用于连接到服务器的套接字
ConnectSocket=socket(AF\u INET、SOCK\u STREAM、IPPROTO\u TCP);
if(ConnectSocket==无效的_套接字){
printf(“套接字失败,错误:%ld\n”,WSAGetLastError());
WSACleanup();
返回1;
}
iResult=connect(ConnectSocket,(struct sockaddr*)&server,sizeof(server));
if(iResult==SOCKET\u错误){
闭合插座(连接插座);
printf(“套接字失败,错误:%ld\n”,WSAGetLastError());
WSACleanup();
返回1;
}
if(ConnectSocket==无效的_套接字){
printf(“无法连接到服务器!\n”);
WSACleanup();
返回1;
}
iResult=recv(ConnectSocket,recvbuf,256,0);
如果(iResult>0)
printf(“收到的字节数:%d\n”,iResult);
else if(iResult==0)
printf(“连接关闭\n”);
其他的
printf(“recv失败,错误:%d\n”,WSAGetLastError());
}
我们编译了上面的代码,服务器和客户端可以相互连接(使用tcpview应用程序检查),但是,我们希望将数据从服务器发送到客户端,winsock2返回错误10057(如果关闭侦听套接字,错误将为10038),发送函数返回-1 一个问题是,您从服务器发送什么?此代码:
iSendResult = send( ClientSocket, recvbuf, iResult, 0 );
似乎正在发送未初始化缓冲区的
iResult
字节(这是上次listen
调用的0)。客户端似乎有一个未在任何地方使用的sendbuf
。似乎有一些bug需要清理,您将能够正常工作…首先,您应该避免在WSAStartup()
之前调用任何winsock函数,这包括htons()
和inet\u addr()
。其次,错误10057是WSAENOTCONN