基于UDP的网络应用程序的编写

 

// UdpSrv.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;
    }

    //创建套接字
    SOCKET sockSrv = socket(AF_INET, SOCK_DGRAM, 0);

    //绑定套接字
    SOCKADDR_IN addrSrc;
    addrSrc.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    addrSrc.sin_family = AF_INET;
    addrSrc.sin_port = htons(6000);
    bind(sockSrv, (SOCKADDR *)&addrSrc, sizeof(SOCKADDR));

    //等待并接收数据
    SOCKADDR_IN addrClient;
    int len = sizeof(SOCKADDR);
    char recvBuf[100];
    recvfrom(sockSrv, recvBuf, 100, 0, (SOCKADDR *)&addrClient, &len);
    printf("%s", recvBuf);
    
    //关闭套接字
    closesocket(sockSrv);
    WSACleanup();
    getchar();
}

 

 

// UdpClient.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;
    }

    //创建套接字
    SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0);

    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    addrSrv.sin_family = AF_INET;
    addrSrv.sin_port = htons(6000);

    //发送数据
    sendto(sockClient, "I am Deng!", sizeof("I am Deng!") + 1, 0, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR));

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