简单的 Socket 实例-优快云博客

本文提供了一个简单的TCP服务器和客户端的C++实现示例。该示例使用WinSock库进行网络通信，展示了如何创建服务器来接收连接并发送消息给客户端，同时客户端能够连接到服务器并接收返回的消息。

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SocketServer.cpp

// SocketServer1.cpp : Defines the entry point for the console application. // #include "stdafx.h" // *******************************************************************// server.cpp : Defines the entry point for the console application. ******************************************************************* #include "stdafx.h" #include <winsock2.h> #include <iostream> #define PORT_SERVER 6656 #define NUM_CLIENTS 10 int main(int argc, char* argv[]) { std::cout << "Start up tcp server." << std::endl; WSADATA wsaData; WORD sockVersion = MAKEWORD(2, 0); if (0 != WSAStartup(sockVersion, &wsaData)) { std::cout << "Failed to retrive socket version." << std::endl; return 0; } SOCKET sock_sev; sock_sev = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == sock_sev) { std::cout << "Invalid socket." << std::endl; WSACleanup(); return 0; } sockaddr_in addr_sev; addr_sev.sin_family = AF_INET; addr_sev.sin_port = htons(PORT_SERVER); addr_sev.sin_addr.s_addr = INADDR_ANY; if (SOCKET_ERROR == bind(sock_sev, (sockaddr *)&addr_sev, sizeof(addr_sev))) { std::cout << "Failed to bind." << std::endl; WSACleanup(); return 0; } if (SOCKET_ERROR == listen(sock_sev, NUM_CLIENTS)) { std::cout << "Failed to listen." << std::endl; WSACleanup(); return 0; } // 多路复用,暂时还未实现.后期会对此给出示例. //fd_set reads; //fd_set writes; //fd_set accepts; //FD_ZERO(&reads); //FD_ZERO(&writes); //FD_ZERO(&accepts); SOCKET sock_client; sockaddr_in addr_client; int nAddrLen = sizeof(addr_client); while (true) { char tmp[512]; sock_client = accept(sock_sev, (sockaddr *)&addr_client, &nAddrLen); if (INVALID_SOCKET == sock_client) { std::cout << "Failed to accept." << std::endl; continue; } sprintf(tmp, "Your IP is %s/n", inet_ntoa(addr_client.sin_addr)); send(sock_client, tmp, strlen(tmp), 0); std::cout << "Connection from " << inet_ntoa(addr_client.sin_addr) << std::endl; closesocket(sock_client); } return 0; }

SocketClient.cpp

// SocketClient1.cpp : Defines the entry point for the console application. // #include "stdafx.h" // *******************************************************************// client.cpp : Defines the entry point for the console application. // author: hnynes// e-mail: hnynes1015@163.com// QQ: 61737489// MSN: hnynes@msn.com// *******************************************************************#include "stdafx.h" #include <winsock2.h> #include <iostream> #define PORT_SERVER 6656 int main(int argc, char* argv[]) { std::cout << "Start up tcp client." << std::endl; WSADATA wsaData; WORD sockVersion = MAKEWORD(2, 0); if (0 != WSAStartup(sockVersion, &wsaData)) { std::cout << "Failed to retrive socket version." << std::endl; return 0; } SOCKET sock_client; sock_client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == sock_client) { std::cout << "Invalid socket." << std::endl; WSACleanup(); return 0; } sockaddr_in addr_sev; addr_sev.sin_family = AF_INET; addr_sev.sin_port = htons(PORT_SERVER); addr_sev.sin_addr.s_addr = inet_addr("127.0.0.1"); if (SOCKET_ERROR == connect(sock_client, (sockaddr *)&addr_sev, sizeof(addr_sev))) { std::cout << "Failed to connect." << std::endl; WSACleanup(); return 0; }char buf[512]; int recv_size = 0; recv_size = recv(sock_client, buf, 512, 0); if (512 > recv_size) { buf[recv_size] = '/0'; std::cout << "receive data is :" << buf << std::endl; memset(buf, 0, sizeof(buf)); } else { std::cout << "receive data is overflow" << std::endl; } closesocket(sock_client); WSACleanup(); system("PAUSE"); return 0; }

Addtional Dependencies: ws2_32.lib