socket 客户端长连接（C++）

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#include "stdafx.h"#include <stdio.h>#include <Winsock2.h>#include <iostream>  #pragma comment(lib, "ws2_32.lib")using namespace std;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[]="123456\n"; //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("192.168.45.136");servAddr.sin_port = htons(666);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;}fd_setwfds, rfds, efds;timeval tv;tv.tv_sec = 10;tv.tv_usec = 500;int count =-1;while(true){FD_ZERO(&wfds);FD_ZERO(&rfds);FD_ZERO(&efds);FD_SET(sHost,&wfds);FD_SET(sHost,&rfds);FD_SET(sHost,&efds);int Rtn = select(FD_SETSIZE,&rfds,&wfds,&efds,&tv);if (Rtn>0){if(FD_ISSET(sHost,&rfds)>0)//表示有读的{count = recv(sHost, bufRecv,BUF_SIZE , 0);}if (FD_ISSET(sHost,&wfds)>0)//表示可以写{if (count>0){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;}count = -1;}}if (FD_ISSET(sHost,&efds)>0)//表示有异常{}}else{cout << "error1";}}//退出closesocket(sHost); //关闭套接字WSACleanup(); //释放套接字资源printf("Hello World!\n");return 0;}
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