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：
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#include <WinSock2.h>
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#include <stdio.h>
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#include <stdlib.h>
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#pragma comment(lib, "ws2_32.lib")
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void main()
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{
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WSADATA wsaData;
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int port =
5099;
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char buf[] =
"Server: hello, I am a server.....";
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if(WSAStartup(MAKEWORD(
2,
2), &wsaData) !=
0)
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{
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printf(
"Failed to load Winsock");
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return;
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}
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//创建用于监听的套接字
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SOCKET sockSrv = socket(AF_INET, SOCK_STREAM,
0);
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SOCKADDR_IN addrSrv;
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addrSrv.sin_family = AF_INET;
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addrSrv.sin_port = htons(port);
//1024以上的端口号
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addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
-
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int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv,
sizeof(SOCKADDR_IN));
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if(retVal == SOCKET_ERROR){
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printf(
"Failed bind:%d\n", WSAGetLastError());
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return;
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}
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if(listen(sockSrv,
10) ==SOCKET_ERROR){
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printf(
"Listen failed:%d", WSAGetLastError());
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return;
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}
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SOCKADDR_IN addrClient;
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int len =
sizeof(SOCKADDR);
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while(
1)
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{
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//等待客户请求到来
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SOCKET sockConn = accept(sockSrv, (SOCKADDR *) &addrClient, &len);
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if(sockConn == SOCKET_ERROR){
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printf(
"Accept failed:%d", WSAGetLastError());
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break;
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}
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printf(
"Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr));
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//发送数据
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int iSend = send(sockConn, buf,
sizeof(buf) ,
0);
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if(iSend == SOCKET_ERROR){
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printf(
"send failed");
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break;
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}
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char recvBuf[
100];
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memset(recvBuf,
0,
sizeof(recvBuf));
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// //接收数据
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recv(sockConn, recvBuf,
sizeof(recvBuf),
0);
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printf(
"%s\n", recvBuf);
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closesocket(sockConn);
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}
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closesocket(sockSrv);
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WSACleanup();
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system(
"pause");
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}
接下来是客户端代码：
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#include <WinSock2.h>
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#include <stdio.h>
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#pragma comment(lib, "ws2_32.lib")
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void main()
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{
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//加载套接字
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WSADATA wsaData;
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char buff[
1024];
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memset(buff,
0,
sizeof(buff));
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if(WSAStartup(MAKEWORD(
2,
2), &wsaData) !=
0)
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{
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printf(
"Failed to load Winsock");
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return;
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}
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SOCKADDR_IN addrSrv;
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addrSrv.sin_family = AF_INET;
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addrSrv.sin_port = htons(
5099);
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addrSrv.sin_addr.S_un.S_addr = inet_addr(
"127.0.0.1");
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//创建套接字
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SOCKET sockClient = socket(AF_INET, SOCK_STREAM,
0);
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if(SOCKET_ERROR == sockClient){
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printf(
"Socket() error:%d", WSAGetLastError());
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return;
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}
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//向服务器发出连接请求
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if(connect(sockClient, (struct sockaddr*)&addrSrv,
sizeof(addrSrv)) == INVALID_SOCKET){
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printf(
"Connect failed:%d", WSAGetLastError());
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return;
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}
else
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{
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//接收数据
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recv(sockClient, buff,
sizeof(buff),
0);
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printf(
"%s\n", buff);
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}
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//发送数据
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char buff =
"hello, this is a Client....";
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send(sockClient, buff,
sizeof(buff),
0);
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//关闭套接字
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closesocket(sockClient);
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WSACleanup();
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}
运行结果：
转载：https://blog.csdn.net/shenjie12345678/article/details/28321969
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