C++基于TCP/IP简单的客户端、服务器通信程序实例

ゞ浴缸里的玫瑰 2022-05-11 05:33 217阅读 0赞

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();
    }