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if(setsockopt(TUdpRec_sUDP,SOL_SOCKET,SO_RCVBUF,(const char*)&nRecvBuf,sizeof(int)) == 0)
printf( "set senbufsize = %d\n", nRecvBuf);
if(getsockopt(TUdpRec_sUDP, SOL_SOCKET, SO_RCVBUF, (char *)&nRecvBuf, &nBufSize) == 0)
printf( "get senbufsize = %d\n", nRecvBuf);
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