udpsrv.cpp

基于UDP协议的服务器端程序

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

void main()
{
	/////////加载动态链接库
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; 
}
   /////////加载动态链接库

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(6001);

bind(socksrv,(SOCKADDR*)&addrsrv,sizeof(SOCKADDR));


SOCKADDR_IN addrClient;
int len=sizeof(SOCKADDR);
char recvbuf[100];

recvfrom(socksrv,recvbuf,100,0,(SOCKADDR*)&addrClient,&len);
printf("%s\n",recvbuf);
closesocket(socksrv);
WSACleanup();
}