windows下socket编程，多线程

sercer端

#include <stdio.h>#include <process.h>#include <Winsock2.h>#pragma comment(lib,"ws2_32.lib")void send(void *a);void showIP();SOCKET sockConn;SOCKADDR_IN addrClient;//连接上的客户端IP地址void main() {printf("server's information\n");showIP();WORD wVersionRequested;   WSADATA wsaData;   int err;wVersionRequested = MAKEWORD(1,1);err = WSAStartup(wVersionRequested,&wsaData);if ( err != 0 )  {return; }if (LOBYTE( wsaData.wVersion ) != 1 || HIBYTE( wsaData.wVersion ) != 1 )  {      WSACleanup();return;   }//构造监听SOCKET,流式SOCKETSOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0); //配置监听地址和端口:SOCKADDR_IN addrSrv;   addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);  addrSrv.sin_family=AF_INET;  addrSrv.sin_port=htons(6003); bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));//绑定端口  listen(sockSrv,5);  int len=sizeof(SOCKADDR); sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len); //接受客户端连接,获取客户端的IP地址   _beginthread(send,0,NULL);char recvBuf[50];while(1){    //char sendBuf[50];//char sendMes[50];//scanf("%s",sendMes);//printf("-->:%s\n",sendMes);//sprintf(sendBuf,sendMes,inet_ntoa(addrClient.sin_addr));//组合消息发送出去   //send(sockConn,sendBuf,strlen(sendBuf)+1,0);//发送消息到客户端   //recv(sockConn,recvBuf,50,0);//接受客户端消息   printf("<--:%s\n",recvBuf);}closesocket(sockConn);//断开连接  } void send(void *a){char sendBuf[50];char sendMes[50];while (1){gets(sendMes);printf("-->:%s\n",sendMes);sprintf(sendBuf,sendMes,inet_ntoa(addrClient.sin_addr));//组合消息发送出去   send(sockConn,sendBuf,strlen(sendBuf)+1,0);//发送消息到客户端  }_endthread();}void showIP() //定义CheckIP（）函数，用于获取本机IP地址 {WSADATA wsaData;char name[20];//定义用于存放获得的主机名的变量 char *ip;//定义IP地址变量 PHOSTENT hostinfo; //调用MAKEWORD（）获得Winsock版本的正确值，用于加载Winsock库 if ( WSAStartup( MAKEWORD(2,0), &wsaData ) == 0 ) { //现在是加载Winsock库，如果WSAStartup（）函数返回值为0，说明加载成功，程序可以继续 if( gethostname ( name, sizeof(name)) == 0) { //如果成功地将本地主机名存放入由name参数指定的缓冲区中 if((hostinfo = gethostbyname(name)) != NULL) { //这是获取主机名，如果获得主机名成功的话，将返回一个指针，指向hostinfo，hostinfo //为PHOSTENT型的变量，下面即将用到这个结构体 ip = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list); //调用inet_ntoa（）函数，将hostinfo结构变量中的h_addr_list转化为标准的点分表示的IP //地址（如192.168.0.1） printf("%s\n",ip);//输出IP地址printf("%s\n",name);} } WSACleanup();//卸载Winsock库，并释放所有资源 }} 

client端

#include <stdio.h> #include <Winsock2.h>#include <process.h>#pragma comment(lib, "ws2_32.lib")  SOCKET sockClient;void send(void *p);void main(){      WORD wVersionRequested;      WSADATA wsaData;//WSAata用来存储系统传回的关于WinSocket的信息     int err;      wVersionRequested = MAKEWORD(1,1);      err = WSAStartup( wVersionRequested, &wsaData);  if ( err != 0 )  {return;     }if ( LOBYTE( wsaData.wVersion ) != 1 ||HIBYTE( wsaData.wVersion ) != 1 )      {          WSACleanup();return;     }      sockClient=socket(AF_INET,SOCK_STREAM,0);//AF_INET表示TCP连接     //初始化连接与端口号     SOCKADDR_IN addrSrv;  char IP[20];printf("Please input server's IP:  ");scanf("%s",IP);addrSrv.sin_addr.S_un.S_addr=inet_addr(IP);//本机地址,服务器在本机开启     addrSrv.sin_family=AF_INET;      addrSrv.sin_port=htons(6003);//设置端口号connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));//连接服务器int hand = _beginthread(send,0,NULL);char recvBuf[50];while (1){//char sendMes[50];//scanf("%s",sendMes);recv(sockClient,recvBuf,50,0);//接受数据printf("<--:%s\n",recvBuf);//printf("-->:%s\n",sendMes);//send(sockClient,sendMes,strlen(sendMes)+1,0);//发送数据 }closesocket(sockClient);//关闭连接      WSACleanup();system("pause");}void send(void *p){char sendMes[50];while (1){gets(sendMes);printf("-->:%s\n",sendMes);send(sockClient,sendMes,strlen(sendMes)+1,0);//发送数据 }_endthread();}