控制台下实现多线程socket通信，服务端为每个请求的客户端创建一个线程，进行通信。其实这些MSDN里都有。

一.基本流程如下：
定义变量->获得winsock版本->加载winsock库->初始化->创建套接字->设置套接字选项->关闭套接字->卸载winsock库->释放资源

二.客户端 建立过程(上篇是客户端)

服务器                        

1   初始化WSA                      
2   建立一个SOCKET               
3   绑定SOCKET                     
4   在指定的端口监听               
5   接受一个连接                   
6   发送和接受数据 
7   断开连接 

三.注意winsock下编程有用到两个库
Winsock2.h

ws2_32.lib 

#include <Winsock2.h>
#include <stdio.h>
#include <process.h>#pragma comment(lib,"ws2_32.lib")unsigned __stdcall ExecuteThread(void* lparam) 
{ SOCKET ClientSocket=(SOCKET)(void*)lparam; char sendText[]="make a connection!\r\n"; send(ClientSocket, sendText, strlen(sendText)+1, 0 );char recvText[100] = {0};if (recv(ClientSocket, recvText, 100, 0) != SOCKET_ERROR){printf("receive text: %s\n", recvText);}	_endthreadex(0);return 0; 
} int main(int argc, char* argv[])
{// (1)加载套接字库WORD wVersionRequested;			//WinSock库的版本号WSADATA wsaData;int iResult = 0;wVersionRequested = MAKEWORD(1, 1);iResult = WSAStartup(wVersionRequested, &wsaData);if( iResult != NO_ERROR){printf("WSAStartup() failed with error: %d\n", iResult);return -1 ;}if( LOBYTE( wsaData.wVersion) != 1 || HIBYTE( wsaData.wVersion) !=1 ){WSACleanup();return -1;}// (2)创建用于监听的套接字SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);if (sockSrv == INVALID_SOCKET) {printf("socket function failed with error: %ld\n", WSAGetLastError());WSACleanup();return -1;}SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(51555);// (3)绑定套接字iResult = bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));if (iResult == SOCKET_ERROR) {printf("bind function failed with error %d\n", WSAGetLastError());iResult = closesocket(sockSrv);if (iResult == SOCKET_ERROR){printf("closesocket function failed with error %d\n", WSAGetLastError());}WSACleanup();return -1;}// (4)将套接字设为监听模式，准备接受客户请求iResult = listen(sockSrv, SOMAXCONN);if (iResult == SOCKET_ERROR){printf("listen function failed with error: %d\n", WSAGetLastError());}printf("Listening on socket...\n");// (5)创建线程等待客户请求SOCKADDR_IN addrClient;int len = sizeof(SOCKADDR);SOCKET sockConn;unsigned dwThreadId; HANDLE hThread; while(1){//等待客户请求sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);if (sockConn == INVALID_SOCKET ){printf("accept function failed with error: %d\n", WSAGetLastError());}// _beginthreadx比createthread更安全hThread = (HANDLE)_beginthreadex(NULL, 0, &ExecuteThread, (void*)sockConn, 0, &dwThreadId );WaitForSingleObject(hThread, INFINITE );}// (6)结束处理CloseHandle(hThread);iResult = closesocket(sockConn);if (iResult == SOCKET_ERROR) {printf("closesocket function failed with error %d\n", WSAGetLastError());WSACleanup();return -1;}WSACleanup();return 0;
}