C++ SOCKET编程求指教

#include <cstdio>  //<stdio.h>
#include <cstdlib>  //<stdlib>
#include <WinSock2.h>
#pragma comment(lib,"win2_32.lib")//加载 ws2_32.dll

void main(void)
{
    //1：初始化windows套间字
    WSAData wsaData;
    int ret;
    if ((ret = WSAStartup(MAKEWORD(2, 2), &wsaData)) != 0)
    {
        printf("WSAStartup failed with error %d\n", ret);
        return;
    }
    //2：创建监听套件字
    SOCKET listeningSocket;
    if ((listeningSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)
    {
        printf("socket failed with error %d\n", WSAGetLastError());
        WSACleanup();
        return;
    }
    //3:把套件字和服务端地址绑定
    SOCKADDR_IN serverAddr;
    int port = 5150;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(port);
    serverAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    if (bind(listeningSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR)
    {
        printf("bind failed with error %d\n", WSAGetLastError());
        closesocket(listeningSocket);
        WSACleanup();
        return;
    }
    //4:开启监听
    if (listen(listeningSocket, 5) == SOCKET_ERROR)
    {
        printf("listen failed with error %d\n", WSAGetLastError());
        closesocket(listeningSocket);
        WSACleanup();
        return;
    }
    printf("We are waiting a connection  on port %d\n", port);
    printf("Listening(我正在监听......)\n");  // NOLINT(clang-diagnostic-invalid-source-encoding)
    //5:接收客户端的连接请求
    SOCKADDR_IN clientAddr;
    int clientAddrLen;
    SOCKET clientNewConnection;
    clientAddrLen = sizeof(SOCKADDR);
    if ((clientNewConnection = accept(listeningSocket, (sockaddr*)&clientAddr, &clientAddrLen)) == INVALID_SOCKET)
    {
        printf("accept failed with error %d\n", WSAGetLastError());
        closesocket(listeningSocket);
        WSACleanup();
        return;
    }
    //6:打印客户端套件字
    //printf("we successfully got a connection from %s:%d\n", inet_ntoa(clientAddr.sin_addr),ntohs(clientAddr.sin_port));
    closesocket(listeningSocket);
    //7：服务器接受客户端套件字
    printf("we are waiting to receive data \n");
    char dataBuffer[1024];
    if ((ret = recv(clientNewConnection, dataBuffer, sizeof(dataBuffer), 0)) == SOCKET_ERROR)
    {
        printf("receive failed with error %d\n", WSAGetLastError());
        closesocket(clientNewConnection);
        WSACleanup();
        return;
    }
    printf("we successfully received %d bytes. \n", ret);
    dataBuffer[ret] = '\0';
    printf("%s\n", dataBuffer);
    //8：关闭连接
    printf("we are now going to close the client connection.\n");
    closesocket(clientNewConnection);
    WSACleanup();
    system("pause");
}