C++基于TCP/IP简单的客户端、服务器通信程序实例

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本篇文章实现了一个基于TCP 的一个非常简单的客户/服务器通信程序实例。该程序中通讯协议使用的是面向连接的TCP协议SOCK_STREAM, 服务器的ip地址为本地地址即：

127.0.0.1，端口号为自定义的5099（大于1024即可），服务端的功能只要有客户端连接请求，服务端就接受连接，在连接成功后向客户端发送数据，并且接受客户端发送的

数据。客户端在向服务端发出请求后接受并显示服务端的数据，并且给服务端也发送数据。

以下代码是服务端程序代码：

#include <WinSock2.h>#include <stdio.h>#include <stdlib.h>#pragma comment(lib, "ws2_32.lib")void main(){WSADATA wsaData;int port = 5099;char buf[] = "Server: hello, I am a server....."; if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0){printf("Failed to load Winsock");return;}//创建用于监听的套接字SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);SOCKADDR_IN addrSrv;addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(port); //1024以上的端口号addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN));if(retVal == SOCKET_ERROR){printf("Failed bind:%d\n", WSAGetLastError());return;}if(listen(sockSrv,10) ==SOCKET_ERROR){printf("Listen failed:%d", WSAGetLastError());return;}SOCKADDR_IN addrClient;int len = sizeof(SOCKADDR);while(1){//等待客户请求到来SOCKET sockConn = accept(sockSrv, (SOCKADDR *) &addrClient, &len);if(sockConn == SOCKET_ERROR){printf("Accept failed:%d", WSAGetLastError());break;}printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr));//发送数据int iSend = send(sockConn, buf, sizeof(buf) , 0);if(iSend == SOCKET_ERROR){printf("send failed");break;} char recvBuf[100]; memset(recvBuf, 0, sizeof(recvBuf));// //接收数据 recv(sockConn, recvBuf, sizeof(recvBuf), 0); printf("%s\n", recvBuf);closesocket(sockConn);}closesocket(sockSrv);WSACleanup();system("pause");}

接下来是客户端代码：

#include <WinSock2.h>#include <stdio.h>#pragma comment(lib, "ws2_32.lib")void main(){//加载套接字WSADATA wsaData;char buff[1024];memset(buff, 0, sizeof(buff));if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0){printf("Failed to load Winsock");return;}SOCKADDR_IN addrSrv;addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(5099);addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//创建套接字SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);if(SOCKET_ERROR == sockClient){printf("Socket() error:%d", WSAGetLastError());return;}//向服务器发出连接请求if(connect(sockClient, (struct  sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET){printf("Connect failed:%d", WSAGetLastError());return;}else{//接收数据recv(sockClient, buff, sizeof(buff), 0);printf("%s\n", buff);}//发送数据char buff = "hello, this is a Client....";send(sockClient, buff, sizeof(buff), 0);//关闭套接字closesocket(sockClient);WSACleanup();}

运行结果：

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