C++ 简单的 Tcp 实现[socket] 客户端与客户端通信

开发环境 Vs 2008 新建一个 win32 console project

// 服务器端代码

// Server.cpp : Defines the entry point for the console application. // #include “stdafx.h” #include “winsock2.h” #pragma comment(lib, “ws2_32.lib”) #include <iostream> using namespace std; int _tmain(int argc, char* argv[]) { const int BUF_SIZE = 64; WSADATA wsd; //WSADATA变量 SOCKET sServer; //服务器套接字 SOCKET sClient; //客户端套接字 SOCKADDR_IN addrServ;; //服务器地址 char buf[BUF_SIZE]; //接收数据缓冲区 char sendBuf[BUF_SIZE];//返回给客户端得数据 int retVal; //返回值 //初始化套结字动态库 if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) { cout << “WSAStartup failed!” << endl; return 1; } //创建套接字 sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(INVALID_SOCKET == sServer) { cout << “socket failed!” << endl; WSACleanup();//释放套接字资源; return -1; } //服务器套接字地址 addrServ.sin_family = AF_INET; addrServ.sin_port = htons(4999); addrServ.sin_addr.s_addr = INADDR_ANY; //绑定套接字 retVal = bind(sServer, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN)); if(SOCKET_ERROR == retVal) { cout << “bind failed!” << endl; closesocket(sServer); //关闭套接字 WSACleanup(); //释放套接字资源; return -1; } //开始监听 retVal = listen(sServer, 1); if(SOCKET_ERROR == retVal) { cout << “listen failed!” << endl; closesocket(sServer); //关闭套接字 WSACleanup(); //释放套接字资源; return -1; } //接受客户端请求 sockaddr_in addrClient; int addrClientlen = sizeof(addrClient); sClient = accept(sServer,(sockaddr FAR*)&addrClient, &addrClientlen); if(INVALID_SOCKET == sClient) { cout << “accept failed!” << endl; closesocket(sServer); //关闭套接字 WSACleanup(); //释放套接字资源; return -1; } while(true){ //接收客户端数据 ZeroMemory(buf, BUF_SIZE); retVal = recv(sClient, buf, BUF_SIZE, 0); if (SOCKET_ERROR == retVal) { cout << “recv failed!” << endl; closesocket(sServer); //关闭套接字 closesocket(sClient); //关闭套接字 WSACleanup(); //释放套接字资源; return -1; } if(buf[0] == ‘0’) break; cout << “客户端发送的数据: ” << buf <<endl; cout << “向客户端发送数据: ” ; cin >> sendBuf; send(sClient, sendBuf, strlen(sendBuf), 0); } //退出 closesocket(sServer); //关闭套接字 closesocket(sClient); //关闭套接字 WSACleanup(); //释放套接字资源; return 0; }

// 客户端代码

// Client.cpp : Defines the entry point for the console application. // #include “stdafx.h” #include “winsock2.h” #include <iostream> #pragma comment(lib, “ws2_32.lib”) using namespace std; BOOL RecvLine(SOCKET s, char* buf); //读取一行数据 int main(int argc, char* argv[]) { const int BUF_SIZE = 64; WSADATA wsd; //WSADATA变量 SOCKET sHost; //服务器套接字 SOCKADDR_IN servAddr; //服务器地址 char buf[BUF_SIZE]; //接收数据缓冲区 char bufRecv[BUF_SIZE]; int retVal; //返回值 //初始化套结字动态库 if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) { cout << “WSAStartup failed!” << endl; return -1; } //创建套接字 sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(INVALID_SOCKET == sHost) { cout << “socket failed!” << endl; WSACleanup();//释放套接字资源 return -1; } //设置服务器地址 servAddr.sin_family =AF_INET; servAddr.sin_addr.s_addr = inet_addr(“127.0.0.1”); servAddr.sin_port = htons((short)4999); int nServAddlen = sizeof(servAddr); //连接服务器 retVal=connect(sHost,(LPSOCKADDR)&servAddr, sizeof(servAddr)); if(SOCKET_ERROR == retVal) { cout << “connect failed!” << endl; closesocket(sHost); //关闭套接字 WSACleanup(); //释放套接字资源 return -1; } while(true){ //向服务器发送数据 ZeroMemory(buf, BUF_SIZE); cout << ” 向服务器发送数据: “; cin >> buf; retVal = send(sHost, buf, strlen(buf), 0); if (SOCKET_ERROR == retVal) { cout << “send failed!” << endl; closesocket(sHost); //关闭套接字 WSACleanup(); //释放套接字资源 return -1; } //RecvLine(sHost, bufRecv); recv(sHost, bufRecv,5 , 0); // 接收服务器端的数据，只接收5个字符 cout << endl <<“从服务器接收数据：” << bufRecv; } //退出 closesocket(sHost); //关闭套接字 WSACleanup(); //释放套接字资源 return 0; }

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