基于TCP的网络应用程序的编写

// TcpSrv.cpp
// dxh1688@gmail.com 

#include <Winsock2.h>
#include <stdio.h>

void main()
{
    //加载套接字库(该部分代码可重用，直接复制即可。)
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;

    wVersionRequested = MAKEWORD(1, 1);
    err = WSAStartup(wVersionRequested, &wsaData);
    if (0 != err) {
        return;
    }
    if (1 != LOBYTE(wsaData.wVersion) ||
        1 != HIBYTE(wsaData.wVersion)) {
        WSACleanup();
        return;
    }

    //创建用于监听的套接字
    SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);

    //绑定套接字
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);            //将主机字节顺序转换为网络字节顺序后再赋值
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(6000);                                            //将主机字节顺序转换为网络字节顺序后再赋值
    bind(sockSrv, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));

    //将套接字设为监听模式，准备接收客户请求
    listen(sockSrv, 5);

    SOCKADDR_IN addrClient;            //用来接收客户端的地址信息
    int len = sizeof(SOCKADDR);
    while (1) {
        //等待客户请求的到来
        SOCKET sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len);            //sockConn保存当前客户端与服务器的连接
        char sendBuf[100];
        sprintf(sendBuf, "Welcome %s to http://www.sunxin.org",
            inet_ntoa(addrClient.sin_addr));            //将in_addr结构体类型地址转换为点分十进制的IP地址

        //发送数据
        send(sockConn, sendBuf, strlen(sendBuf) +1, 0);
        
        //接收数据
        char recvBuf[100];
        recv(sockConn, recvBuf, 100, 0);

        //打印接收的数据
        printf("%s\n", recvBuf);

        //关闭套接字
        closesocket(sockConn);
    }
}

// TcpClient.cpp
// dxh1688@gmail.com 

#include <Winsock2.h>
#include <stdio.h>

void main()
{
    //加载套接字
    WORD wVersionRequestSted;
    WSADATA wsaData;
    int err;

    wVersionRequestSted = MAKEWORD(1, 1);
    err = WSAStartup(wVersionRequestSted, &wsaData);
    if (0 != err) {
        return;
    }
    if (1 != LOBYTE(wsaData.wVersion) ||
        1 != HIBYTE(wsaData.wVersion)) {
        WSACleanup();
        return;
    }

    //创建套接字
    SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
    
    //向服务器发出连接请求
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.01");            //将点分十进制表示的IP地址转换为u_long类型后再赋值
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(6000);
    connect(sockClient, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));

    //接收数据
    char recvBuf[100];
    recv(sockClient, recvBuf, 100, 0);
    printf("%s\n", recvBuf);

    //发送数据
    send(sockClient, "This is Li Si !", strlen("This is Li Si !") + 1, 0);

    //关闭套接字
    closesocket(sockClient);
    WSACleanup();
    getchar();
}