windows 网络编程(四)UDP对话的实现

次程序只能实现一问一答的模式聊天，要实现随机性聊天貌似要用到线程

参考资料http://www.cnblogs.com/qxhcpp/archive/2012/04/27/2473756.html

服务端：

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

void main()
{
    WORD wVersionRequested;//定义一个word类型的变量
    WSADATA wsaData;
    int err;
    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if ( err != 0 ) {
        return;
    }
                                         
    if ( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1 ) {
        WSACleanup( );
        return; 
    }


    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);

    bind(socksrv,(SOCKADDR*)&addrsrv,sizeof(SOCKADDR));
    
    char recvBuf[100];
    char sendBuf[100];
    char tempBuf[200];


    SOCKADDR_IN addrClient;

    int len=sizeof(SOCKADDR);
    while(1)
    {
        recvfrom(socksrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);
        if('q'==recvBuf[0])//判断如果第一个字符是Q则退出
        {
            sendto(socksrv,"q",strlen("q")+1,0,(SOCKADDR*)&addrClient,len);
            printf("chat end !\n");
            break;
        }
        sprintf(tempBuf,"%s say:%s",inet_ntoa(addrClient.sin_addr),recvBuf);
        //如果不是Q则将客户端的IP地址和发送的数据格式化完放到tempBUf中
        printf("%s\n",tempBuf);
        printf("please input data:\n");
        //等待用户输入
        gets(sendBuf);//从标准输入流中获取一行数据
        sendto(socksrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len);
        //将用户输入的数据发送到客户端
    }
     closesocket(socksrv);
     WSACleanup();


}

客户端：

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

void main()
{
    WORD wVersionRequested;//定义一个word类型的变量
    WSADATA wsaData;
    int err;
    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if ( err != 0 ) {
        return;
    }
                                         
    if ( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1 ) {
        WSACleanup( );
        return; 
    }
    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);


    char recvBuf[100];
    char sendBuf[100];
    char tempBuf[200];


    int len=sizeof(SOCKADDR);
	sendto(sockClient,"start",strlen("start")+1,0,
                (SOCKADDR*)&addrsrv,len);
    while(1)
    {
        
        //等待服务器端的回应
        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!\n");
            break;
        
        
        
        }
        sprintf(tempBuf,"%s say :%s",inet_ntoa(addrsrv.sin_addr),recvBuf);
        printf("%s\n",tempBuf);
		
		printf("please input data:\n");
        gets(sendBuf);
        sendto(sockClient,sendBuf,strlen(sendBuf)+1,0,
            (SOCKADDR*)&addrsrv,len);
    
    
    }
     closesocket(sockClient);
     WSACleanup();
}