1、C++基於TCP_IP簡單的客戶端、服務器通信程序實例 - happy_xiahuixiax的博客 - CSDN博客.html（https://blog.csdn.net/happy_xiahuixiax/article/details/72627426）

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3、代碼：（VC6 編譯通過，未測試...）

#include <WinSock2.h>  
#include <stdio.h>  
#include <stdlib.h>  

#pragma comment(lib, "ws2_32.lib")  

void main()  
{  
    WSADATA wsaData;  
    
 
int port = 8000;  

    char buf[] = "Server: hello, I am a server.....";   

    if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)  
    {  
        printf("Failed to load Winsock");  
        return;  
    }  

    //創建用於監聽的套接字  
    SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);  

    SOCKADDR_IN addrSrv;  
    addrSrv.sin_family 
 
= AF_INET;  
    addrSrv.sin_port = htons(port); //1024以上的端口號  
    addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);  

    int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN));  
    if(retVal == SOCKET_ERROR){  
        printf("Failed bind:%d\n", WSAGetLastError());  
        return
 
;  
    }  

    if(listen(sockSrv,10) ==SOCKET_ERROR){  
        printf("Listen failed:%d", WSAGetLastError());  
        return;  
    }  

    SOCKADDR_IN addrClient;  
    int len = sizeof(SOCKADDR);  

    while(1)  
    {  
        //等待客戶請求到來    
        SOCKET sockConn = accept(sockSrv, (SOCKADDR *) &addrClient, &len);  
        if(sockConn == SOCKET_ERROR){  
            printf("Accept failed:%d", WSAGetLastError());  
            break;  
        }  

        printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr));  

        //發送數據  
        int iSend = send(sockConn, buf, sizeof(buf) , 0);  
        if(iSend == SOCKET_ERROR){  
            printf("send failed");  
            break;  
        }  

        char recvBuf[100];  
        memset(recvBuf, 0, sizeof(recvBuf));  
//      //接收數據  
        recv(sockConn, recvBuf, sizeof(recvBuf), 0);  
        printf("%s\n", recvBuf);  

        closesocket(sockConn);  
    }  

    closesocket(sockSrv);  
    WSACleanup();  
    system("pause");  
}

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VC小工具.最簡單TCP服務器