VC++编写的Socket udp通信程序

 

UDP的服务器端:(UdpSrv.cpp)

 

＃i nclude "Winsock2.h"

＃i nclude "stdio.h"

 

void main()

{

//初始化socket库

WORD wVersionRequested;

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(4000) ;

 

bind( sockSrv , (SOCKADDR*)&addrSrv , sizeof(SOCKADDR) ) ;

 

char sendBuf[100] ;

char recvBuf[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] )

   {

    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) ;

   printf( "%s/n" , tempBuf ) ;

   printf( "Please input data:/n" ) ;

   gets( sendBuf ) ;

   sendto(sockSrv,sendBuf,strlen(sendBuf)+1,0,(SOCKADDR*)&addrClient,len) ;

}

 

closesocket( sockSrv ) ;

WSACleanup() ;

}

UDP的客户端:(UdpClient.cpp)

 

＃i nclude "Winsock2.h"

＃i nclude "stdio.h"

 

void main()

{

//³õʼ»¯socket¿â

WORD wVersionRequested;

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(4000) ;

 

char sendBuf[100] ;

char recvBuf[100] ;

char tempBuf[200] ;

 

int len = sizeof(SOCKADDR) ;

 

while (1)

{

   printf("Please input data:/n");

   gets( sendBuf ) ;

   sendto( sockClient , sendBuf , strlen(sendBuf) , 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/n" , inet_ntoa(addrSrv.sin_addr) , recvBuf ) ;

   printf( tempBuf ) ;

}

 

closesocket(sockClient) ;

WSACleanup() ;

}