https://blog.csdn.net/xiaoquantouer/article/details/58001960
看计算机网络,跟着敲了一下这篇代码,感觉c++写起来真费劲。。
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TCP服务器端代码如下
#include <stdio.h> #include <winsock2.h> #pragma comment(lib,"ws2_32.lib")//链接这个库 //TCP服务器端 int main(int argc,char* argv[]){ //调用winsock WORD sockVersion = MAKEWORD(2,2);//请求使用的winsock版本 WSADATA wsaData; // 实际返回的winsock版本 if(WSAStartup(sockVersion,&wsaData)!=0){ return 0; } //创建socket SOCKET slisten = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);//参数分别为协议族,类型,协议号 AF_INET代表TCP/IP if(slisten == INVALID_SOCKET){//异常处理 printf("scoket error!"); return 0; } //bind sockaddr_in sin; //服务器端点地址 sin.sin_family = AF_INET; //协议族 sin.sin_port = htons(8888); //端口号, htons函数将本地字节顺序变为网络字节顺序(16位) sin.sin_addr.S_un.S_addr = INADDR_ANY;//服务器bind时需要使用地址通配 if(bind(slisten,(LPSOCKADDR)&sin,sizeof(sin)) == SOCKET_ERROR){ //LPSOCKADDR是类型强制转换 printf("bind error !"); } //listen if(listen(slisten,5)==SOCKET_ERROR){ //5为queuesize,缓存区大小 printf("listen error !"); return 0; } //由于使用的是TCP ,socket stream,要循环接收数据 SOCKET sClient;//声明变量 sockaddr_in remoteAddr; int nAddrlen = sizeof(remoteAddr); char revData[255];//buffer while(true) { printf("等待连接...\n"); sClient = accept(slisten,(SOCKADDR *)&remoteAddr,&nAddrlen);//accept会新建一个socket if(sClient==INVALID_SOCKET){ printf("accept error !"); continue;//重新开始循环 } printf("接收到一个连接: %s \r\n",inet_ntoa(remoteAddr.sin_addr)); //inet将ip地址结构转成字符串 , \r是回车 //接收数据 int ret = recv(sClient,revData,255,0); if(ret>0){ revData[ret] = 0x00; printf(revData); } //发送数据 const char* sendData = "你好,TCP客户端!\n"; send(sClient,sendData,strlen(sendData),0); closesocket(sClient); } closesocket(slisten); WSACleanup(); return 0; }
TCP客户端
#include<WINSOCK2.H> #include<STDIO.H> #include<iostream> #include<cstring> using namespace std; #pragma comment(lib,"ws2_32.lib")//链接这个库 //TCP客户端 int main(){ WORD sockVersion = MAKEWORD(2,2); WSADATA data; if(WSAStartup(sockVersion,&data)!=0){ return 0; } while(true){ SOCKET sclient = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP); if(sclient == INVALID_SOCKET){ printf("invalid socket!"); return 0; } sockaddr_in serAddr; //要连接的服务器端 的 端点地址 serAddr.sin_family = AF_INET; serAddr.sin_port = htons(8888); serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //将ip变为地址结构 //客户端程序不需要bind本机端点地址,系统会自动完成 if(connect(sclient,(sockaddr*)&serAddr,sizeof(serAddr))==SOCKET_ERROR){ printf("connect error !"); closesocket(sclient); return 0; } string data; cin>>data;//键盘读入数据 const char* sendData; sendData = data.c_str(); //string变为const char* send(sclient,sendData,strlen(sendData),0); //本程序中,客户端不管发什么给服务器,服务器都只发回一句 "你好,TCP客户端!\n" char recData[255]; int ret = recv(sclient,recData,255,0); if(ret>0){ recData[ret] = 0x00; printf(recData); } closesocket(sclient); } WSACleanup(); return 0; }