服务端：

//vc的第一套socket，第二套socket，可能存在冲突

#define WIN32_LEAN_AND_MEAN
#define  _WINSOCK_DEPRECATED_NO_WARNINGS //也可以放到工程属性，预处理中

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

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

struct DataPackage
{
    int age;
    char name[32];
};

int main()
{
    //启动Windows socket 2.x环境
    WORD ver = MAKEWORD(2, 2);
    WSADATA dat;
    WSAStartup(ver, &dat);

    //--用Socket API建立简易TCP服务端
    //1.建立一个socket
    SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    //2 bind绑定用于接受客户端连接的网络端口
    sockaddr_in _sin = {};
    _sin.sin_family = AF_INET;
    _sin.sin_port = htons(4567);//host to net unsigned
    _sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    //使用127.0.0.1可以防止外网访问
    //启用本机全部的ip地址可以使用，INADDR_ANY
    if (SOCKET_ERROR == bind(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in)))
    {
        printf("错误，绑定网络端口失败...\n");
    }
    else
    {
        printf("绑定网络端口成功...\n");
    }
    //3 listen 监听网络端口
    if (SOCKET_ERROR == listen(_sock, 5))
    {
        printf("错误，监听网络端口失败...\n");
    }
    else
    {
        printf("监听网络端口成功...\n");
    }
    //4 accept等待接受客户端连接
    sockaddr_in clientAddr = {};
    int nAddrLen = sizeof(clientAddr);
    SOCKET _cSock = INVALID_SOCKET;
    

    _cSock = accept(_sock, (sockaddr*)&clientAddr, &nAddrLen);
    if (INVALID_SOCKET == _cSock)
    {
        printf("错误，接受到无效客户端socket...\n");
    }
    printf("新客户端加入:IP=%s\n", inet_ntoa(clientAddr.sin_addr));
    char _recvBuf[128] = {};

    while (true)
    {
        //5 接收客户端数据
        int nLen = recv(_cSock, _recvBuf, 128, 0);
        if (nLen < 0)
        {
            printf("客户端已退出，任务结束。");
            break;
        }

        printf("收到客户端请求:%s\n", _recvBuf);

        //6 处理客户端请求
        if (0 == strcmp(_recvBuf, "getInfo"))
        {
            DataPackage dp = {80, "xiaoqiang"};
            //7 send向客户端发送一条数据
            send(_cSock, (const char*)&dp, sizeof(DataPackage), 0);
        }
        else if (0 == strcmp(_recvBuf, "getAge"))
        {
            char msgBuf[] = "80.";
            //7 send向客户端发送一条数据
            send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
        }
        else
        {
            char msgBuf[] = "???.";
            //7 send向客户端发送一条数据
            send(_cSock, msgBuf, strlen(msgBuf) + 1, 0);
        }


    }

    //6 关闭套接字closesocket
    closesocket(_sock);


    //清除Windows socket环境
    WSACleanup();
    printf("已退出。");
    getchar();
    return 0;
}

 

 

客户端：

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS //也可以放到工程属性，预处理中
//#define _CRT_SECURE_NO_WARNINGS

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


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

struct DataPackage {
    int age;
    char name[32];
};

int main()
{

    //启动Windows socket 2.x环境
    WORD ver = MAKEWORD(2, 2);
    WSADATA dat;
    WSAStartup(ver, &dat);
    //---------------------------
    //--用Socket API建立简易TCP客户端
    //1 建立一个socket
    SOCKET _sock = INVALID_SOCKET;
    _sock = socket(AF_INET, SOCK_STREAM, 0);
    if (INVALID_SOCKET == _sock)
    {
        printf("错误，建立Socket失败...\n");
    }
    else
    {
        printf("建立Socket成功...\n");
    }
    //2 连接服务器connect
    sockaddr_in _sin = {};
    _sin.sin_family = AF_INET;
    _sin.sin_port = htons(4567);//host to net unsigned
    _sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    int ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
    if (SOCKET_ERROR == ret)
    {
        printf("错误，连接服务端失败...\n");
    }
    else
    {
        printf("连接服务端成功...\n");
    }

    
    while (true)
    {
        //3输入请求命令
        char cmdBuf[128] = {};
        scanf_s("%s", cmdBuf, 128);
        //4处理请求
        if (0 == strcmp(cmdBuf, "exit"))
        {
            printf("收到exit命令，任务结束。");
            break;
        }
        else
        {
            //5向服务器发送请求命令
            send(_sock, cmdBuf, strlen(cmdBuf) + 1, 0);
        }

        //6 接受服务器信息recv
        char recvBuf[256] = {};
        int nlen = recv(_sock, recvBuf, 256, 0);
        if (nlen > 0)
        {
            DataPackage* dp = (DataPackage*)recvBuf;
            printf("接收到数据:age=%d,name=%s\n", dp->age, dp->name);
        }

    }



    //7 关闭套接字closesocket
    closesocket(_sock);

    //清除Windows socket环境
    WSACleanup();
    printf("已退出。");
    getchar();
    return 0;
}