最简单的Windows套接字(Socket)例子（源码，实例） 佟强(http://blog.csdn.net/microtong) 2008年11月21日
Server.exe PortNumber，例如Server 8000
Client.exe IPAddress PortNumber，例如Client 127.0.0.1 8000
然后在客户端的命令行输入字符串并回车，客户端将会把消息发送到服务器，服务器再把消息传回客户端。
服务器端，Server.cpp
- //Server.cpp
- #include <winsock2.h>
- #include <stdio.h>
- #include <windows.h>
- #pragma comment(lib,"ws2_32.lib")
- int main(int argc, char* argv[]){
- //判断是否输入了端口号
- if(argc!=2){
- printf("Usage: %s PortNumber/n",argv[0]);
- exit(-1);
- }
- //把端口号转化成整数
- short port;
- if((port = atoi(argv[1]))==0){
- printf("端口号有误！");
- exit(-1);
- }
- WSADATA wsa;
- //初始化套接字DLL
- if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){
- printf("套接字初始化失败!");
- exit(-1);
- }
- //创建套接字
- SOCKET serverSocket;
- if((serverSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){
- printf("创建套接字失败！");
- exit(-1);
- }
- struct sockaddr_in serverAddress;
- memset(&serverAddress,0,sizeof(sockaddr_in));
- serverAddress.sin_family=AF_INET;
- serverAddress.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
- serverAddress.sin_port = htons(port);
- //绑定
- if(bind(serverSocket,(sockaddr*)&serverAddress,sizeof(serverAddress))==SOCKET_ERROR){
- printf("套接字绑定到端口失败！端口: %d/n",port);
- exit(-1);
- }
- //进入侦听状态
- if(listen(serverSocket,SOMAXCONN)==SOCKET_ERROR){
- printf("侦听失败！");
- exit(-1);
- }
- printf("Server %d is listening....../n",port);
- SOCKET clientSocket;//用来和客户端通信的套接字
- struct sockaddr_in clientAddress;//用来和客户端通信的套接字地址
- memset(&clientAddress,0,sizeof(clientAddress));
- int addrlen = sizeof(clientAddress);
- //接受连接
- if((clientSocket=accept(serverSocket,(sockaddr*)&clientAddress,&addrlen))==INVALID_SOCKET){
- printf("接受客户端连接失败！");
- exit(-1);
- }
- printf("Accept connection from %s/n",inet_ntoa(clientAddress.sin_addr));
- char buf[4096];
- while(1){
- //接收数据
- int bytes;
- if((bytes=recv(clientSocket,buf,sizeof(buf),0))==SOCKET_ERROR){
- printf("接收数据失败!/n");
- exit(-1);
- }
- buf[bytes]='/0';
- printf("Message from %s: %s/n",inet_ntoa(clientAddress.sin_addr),buf);
- if(send(clientSocket,buf,bytes,0)==SOCKET_ERROR){
- printf("发送数据失败！");
- exit(-1);
- }
- }
- //清理套接字占用的资源
- WSACleanup();
- return 0;
- }
客户端，Client.cpp
- //Client.cpp
- #include <winsock2.h>
- #include <stdio.h>
- #include <windows.h>
- #pragma comment(lib,"ws2_32.lib")
- int main(int argc, char* argv[]){
- //判断是否输入了IP地址和端口号
- if(argc!=3){
- printf("Usage: %s IPAddress PortNumber/n",argv[0]);
- exit(-1);
- }
- //把字符串的IP地址转化为u_long
- unsigned long ip;
- if((ip=inet_addr(argv[1]))==INADDR_NONE){
- printf("不合法的IP地址：%s",argv[1]);
- exit(-1);
- }
- //把端口号转化成整数
- short port;
- if((port = atoi(argv[2]))==0){
- printf("端口号有误！");
- exit(-1);
- }
- printf("Connecting to %s:%d....../n",inet_ntoa(*(in_addr*)&ip),port);
- WSADATA wsa;
- //初始化套接字DLL
- if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){
- printf("套接字初始化失败!");
- exit(-1);
- }
- //创建套接字
- SOCKET sock;
- if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==INVALID_SOCKET){
- printf("创建套接字失败！");
- exit(-1);
- }
- struct sockaddr_in serverAddress;
- memset(&serverAddress,0,sizeof(sockaddr_in));
- serverAddress.sin_family=AF_INET;
- serverAddress.sin_addr.S_un.S_addr = ip;
- serverAddress.sin_port = htons(port);
- //建立和服务器的连接
- if(connect(sock,(sockaddr*)&serverAddress,sizeof(serverAddress))==SOCKET_ERROR){
- printf("建立连接失败！");
- exit(-1);
- }
- char buf[4096];
- while(1){
- printf(">");
- //从控制台读取一行数据
- gets(buf);
- //发送给服务器
- if(send(sock,buf,strlen(buf),0)==SOCKET_ERROR){
- printf("发送数据失败！");
- exit(-1);
- }
- int bytes;
- if((bytes=recv(sock,buf,sizeof(buf),0))==SOCKET_ERROR){
- printf("接收数据失败!/n");
- exit(-1);
- }
- buf[bytes]='/0';
- printf("Message from %s: %s/n",inet_ntoa(serverAddress.sin_addr),buf);
- }
- //清理套接字占用的资源
- WSACleanup();
- return 0;
- }