socket 编程练习--UDP聊天程序

服务器端：

// UdpSrv.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Winsock2.h>   //必须加载套接字的头文件，还必须在工程的链接处添加 Ws2_32.lib
#include <stdio.h>

int main(int argc, char* argv[])
{
    //加载套接字库
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    
    wVersionRequested =MAKEWORD(1,1);
    
    err =WSAStartup(wVersionRequested,&wsaData );
    if(err!=0)
    {
        return 0;
    }
    
    if(LOBYTE(wsaData.wVersion)!=1 ||
        HIBYTE(wsaData.wVersion)!=1 )
    {
        WSACleanup ();
        return 0;
    }
    
    //创建套接字
    SOCKET sockSrv =socket(AF_INET,SOCK_DGRAM,0);
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr =htonl(INADDR_ANY);
    addrSrv.sin_family =AF_INET;
    addrSrv.sin_port =htons(6000);
    
    //绑定套接字
    bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
    
    //等待并接受数据
    char recvBuf[100];
    char sendBuf[100];
    char tempBuf[100];
    
    
    SOCKADDR_IN addrClient ;
    int len =sizeof(SOCKADDR);
    while(1)
    {
        recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR *) &addrClient,&len);
        if('q'==recvBuf[0])
        {
            sendto(sockSrv,"q",strlen("q")+1,0,(SOCKADDR *)&addrClient,len);
            printf("chat end!
");
            break;
        }
        sprintf(tempBuf,"%s say : %s",inet_ntoa(addrClient.sin_addr),recvBuf);
        printf("%s
",tempBuf);
        //send data
        printf("please input data: 
");
        gets(sendBuf);
        sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR *)&addrClient,len);
    }
    //关闭套接字
    WSACleanup();
    return 0;
}

客户端：

// UdpClient.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Winsock2.h>   //必须加载套接字的头文件，还必须在工程的链接处添加 Ws2_32.lib
#include <stdio.h>


int main(int argc, char* argv[])
{
    //加载套接字库
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;
    
    wVersionRequested =MAKEWORD(1,1);
    
    err =WSAStartup(wVersionRequested,&wsaData );
    if(err!=0)
    {
        return 0;
    }
    
    if(LOBYTE(wsaData.wVersion)!=1 ||
        HIBYTE(wsaData.wVersion)!=1 )
    {
        WSACleanup ();
        return 0;
    }
    
    //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("219.244.93.95");
    addrSrv.sin_family =AF_INET;
    addrSrv.sin_port =htons(6000);

    char recvBuf[100];
    char sendBuf[100];
    char tempBuf[100];
    
    
    
    int len =sizeof(SOCKADDR);
    while(1)
    {
        //send data
        printf("please input data: 
");
        gets(sendBuf);
        sendto(sockClient,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR *)&addrSrv,len);

        recvfrom(sockClient,recvBuf,100,0,(SOCKADDR *) &addrSrv,&len);
        if('q'==recvBuf[0])
        {
            sendto(sockClient,"q",strlen("q")+1,0,(SOCKADDR *)&addrSrv,len);
            printf("chat end!
");
            break;
        }
        sprintf(tempBuf,"%s say : %s",inet_ntoa(addrSrv.sin_addr),recvBuf);
        printf("%s
",tempBuf);
    
    }    

    //关闭套接字
    closesocket (sockClient);
    WSACleanup();
    return 0;
}

基于tcp的多一个链接过程。