#include "stdafx.h"#include <Winsock2.h>#include <iostream>#pragma  comment(lib,"ws2_32.lib")using namespace std;void main(){    int err;    WORD versionRequired;    WSADATA wsaData;    versionRequired=MAKEWORD(1,1);    err=WSAStartup(versionRequired,&wsaData);//协议库的版本信息    if (!err)    {        printf("客户端嵌套字已经打开!\n");    }    else    {        printf("客户端的嵌套字打开失败!\n");        return;//结束    }    SOCKET clientSocket=socket(AF_INET,SOCK_STREAM,0);    SOCKADDR_IN clientsock_in;    clientsock_in.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");    clientsock_in.sin_family=AF_INET;    clientsock_in.sin_port=htons(8001);    //bind(clientSocket,(SOCKADDR*)&clientsock_in,strlen(SOCKADDR));//注意第三个参数    //listen(clientSocket,5);    connect(clientSocket,(SOCKADDR*)&clientsock_in,sizeof(SOCKADDR));//开始连接    char receiveBuf[100];    recv(clientSocket,receiveBuf,101,0);    printf("%s\n",receiveBuf);    //send(clientSocket,"hello,this is client",strlen("hello,this is client")+1,0);    send(clientSocket,"123",strlen("123")+1,0);    char receiveBuff[100];    recv(clientSocket,receiveBuff,101,0);    printf("%s\n",receiveBuff);    closesocket(clientSocket);    WSACleanup();}