EasyServer.cpp

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS

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

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

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服务器端
    // 1建立一个Socket
    SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    // 2 bind 绑定用于接收客户端连接的网络端口
    sockaddr_in _sin = {};
    _sin.sin_family = AF_INET;
    _sin.sin_port = htons(4567);
    _sin.sin_addr.S_un.S_addr = INADDR_ANY;//inet_addr("127.0.0.1");
    if (bind(sock, (sockaddr*)&_sin, sizeof(_sin)) == SOCKET_ERROR) {
        printf("Bind Port Error\n");
    }
    else {
        printf("Bind Port Success\n");
    }
    // 3 listen 监听网络端口
    if (listen(sock, 5) == SOCKET_ERROR) {
        printf("listen failed\n");
    }
    else {
        printf("listen success\n");
    }
    // 4 accept 等待客户端连接
    sockaddr_in clientAddr = {};
    int cAddrlen = sizeof(sockaddr_in);
    SOCKET csock = INVALID_SOCKET;
    csock = accept(sock, (sockaddr*)&clientAddr, &cAddrlen);
    if (csock == INVALID_SOCKET) {
        printf("failed , recieve a invalid client socket\n");
    }
    printf("new client join:socket = %d , IP = %s \n", csock , inet_ntoa(clientAddr.sin_addr));

char recvbuf[128] = {};
    while (true) {
        // 接收客户端的请求数据
        int len = recv(csock, recvbuf, 128, 0);
        if (len <= 0) {
            printf("client exit\n");
            break;
        }
        printf("收到命令:%s\n", recvbuf);
        // 处理请求
        if (0 == strcmp(recvbuf, "getName")) {
            char buf[] = "JianFeng";
            send(csock, buf, strlen(buf) + 1 , 0);
        }
        else if (0 == strcmp(recvbuf, "getAge")) {
            char buf[] = "24";
            send(csock, buf, strlen(buf) + 1, 0);
        }
        else {
            char buf[] = "???";
            send(csock, buf, strlen(buf) + 1, 0);
        }
    }
    // 6 关闭套接字
    closesocket(sock);
    WSACleanup();
    return 0;
}

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EasyServer.cpp

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