from: http://blog.csdn.net/ccf19881030/article/details/16991215
采用的是VC2008,控制台应用程序，使用UDP编写。
1、服务端代码
//UDPServer.cpp
[cpp] view plain copy #include <WinSock2.h> #include <stdio.h> #define SERVERPORT 6000 //服务端口号 #pragma comment(lib, "WS2_32.lib"); int main(int argc, char *argv[]) { //加载套接字库 WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ return -1; } /* Confirm that the WinSock DLL supports 2.2.*/ /* Note that if the DLL supports versions greater */ /* than 2.2 in addition to 2.2, it will still return */ /* 2.2 in wVersion since that is the version we */ /* requested. */ if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ WSACleanup( ); return -1; } /* The WinSock DLL is acceptable. Proceed. */ //创建套接字 SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, 0); if (INVALID_SOCKET == sockServer) { printf("socket() called failed! The error code is: %d\n", WSAGetLastError()); return -1; } else { printf("socket() called succesful!\n"); } //服务器端 SOCKADDR_IN addrServer; addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addrServer.sin_family = AF_INET; addrServer.sin_port = htons(SERVERPORT); //绑定套接字 err = bind(sockServer, (SOCKADDR*)&addrServer, sizeof(SOCKADDR)); if (SOCKET_ERROR == err) { printf("bind() called failed! The error code is: %d\n", WSAGetLastError()); return -1; } else { printf("bind() called successful!\n"); } //等待并接收数据 SOCKADDR_IN addrClient;//用于接收发送端的地址信息 int len = sizeof(SOCKADDR); char recvBuf[100]; recvfrom(sockServer, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len); //打印接收到的数据 printf("receive data:%s from client [%s,%d]", recvBuf, inet_ntoa(addrClient.sin_addr), addrClient.sin_port); //关闭套接字 closesocket(sockServer); //终止套接字库的使用 WSACleanup(); return 0; }
2、客户端代码
//UDPClient.cpp
[cpp] view plain copy #include <WinSock2.h> #include <stdio.h> #define SERVERPORT 6000 //服务端口号 #pragma comment(lib, "WS2_32.lib"); int main(int argc, char *argv[]) { //加载套接字库 WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ return -1; } /* Confirm that the WinSock DLL supports 2.2.*/ /* Note that if the DLL supports versions greater */ /* than 2.2 in addition to 2.2, it will still return */ /* 2.2 in wVersion since that is the version we */ /* requested. */ if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ WSACleanup( ); return -1; } //创建套接字 SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0); if (INVALID_SOCKET == sockClient) { printf("socket() called failed! The error code is: %d\n", WSAGetLastError()); return -1; } else { printf("socket() called succesful!\n"); } SOCKADDR_IN addrServer; addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); addrServer.sin_family = AF_INET; addrServer.sin_port = htons(SERVERPORT); //发送数据 err = sendto(sockClient, "Hello", strlen("Hello")+1, 0, (SOCKADDR*)&addrServer, sizeof(SOCKADDR)); if (SOCKET_ERROR == err) { printf("sendto() called failed! The error code is: %s\n", WSAGetLastError()); return -1; } else { printf("sendto() called successful!\n"); } //关闭套接字 closesocket(sockClient); //终止套接字库的使用 WSACleanup(); return 0; } 先启动服务端UDPServer程序，再启动客户端UDPClient程序，运行结果如下：
服务端UDPServer
客户端UDPClient
此时服务端UDPServer的结果会发生变化，会受到客户端发送过来的数据，如下图所示：
参考资料：
1、《VC++深入详解》 第14章网络编程 ，孙鑫主编
2、MSDN帮助文档
