c++ TCP通信

#include <Winsock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")

void main()
{
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;

    wVersionRequested = MAKEWORD( 1, 1 );

    err = WSAStartup( wVersionRequested, &wsaData );
    if ( err != 0 ) {

        return;
    }

    if ( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1) {
            WSACleanup( );
            return;
    }
    SOCKET socksrv=socket(AF_INET,SOCK_STREAM,0);

    SOCKADDR_IN addrsrv;
    addrsrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
    addrsrv.sin_family=AF_INET;
    addrsrv.sin_port=htons(4444);

    bind(socksrv,(sockaddr*)&addrsrv,sizeof(SOCKADDR));

    listen(socksrv,5);

    SOCKADDR_IN addrclient;
    int len=sizeof(SOCKADDR);

    while(1)
    {
        SOCKET sockconn=accept(socksrv,(SOCKADDR*)&addrclient,&len);
        char sendbuf[100];
        sprintf(sendbuf,"welcome %s to TCP server",inet_ntoa(addrclient.sin_addr));
        send(sockconn,sendbuf,strlen(sendbuf)+1,0);
        char recvbuf[100];
        recv(sockconn,recvbuf,100,0);
        printf("%s\n",recvbuf);
        closesocket(sockconn);

    }

}