i'm new programmer, plz help me in DATAGRAM

[zagaa]

i make client server application in DATAGRAM. but if server waiting data to recieve cannot send data. it cannot work like thread. i know "recvfrom" is waiting data comming. but i cannot check data is coming or not. i dont know how i check it. i readed in "CAsyncSocket" it have "onRecieve" function can be used. but in here how i can?. plz help me. thanks

zagaa

int CUDPServer::Run() 
{
	SOCKET		sockfd;
	int		n;
	SOCKADDR_IN	servaddr, cliaddr;
    char			mesg[100];
    int sin_size = sizeof(struct sockaddr_in);
	int mBind;
	DWORD mRet = 0x01L;

	if (ConInitialize() == FALSE)
		return 0;

	sockfd = socket(AF_INET, SOCK_DGRAM, 0);

	servaddr.sin_family      = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port        = htons(SERVER_PORT);
	memset(&(servaddr.sin_zero), 0, 8);

	mBind =  bind(sockfd, (LPSOCKADDR) &servaddr, sizeof(servaddr));

	while(1)
	{
		if (mSendBool == FALSE && mRecvBool == FALSE)
			Sleep(1);

		// transiver
		if (mSendBool == TRUE)
		{
			strcpy(mesg, mSendStr);
			sendto(sockfd, mesg, strlen(mesg), 0, (LPSOCKADDR) &cliaddr,  sin_size);
			mSendBool = FALSE;
		}
		// reciever
		//mRet = WaitForMultipleObjects(sockfd, 50);
		if (mRecv == TRUE)
		{
			n = recvfrom(sockfd, mesg, 100, 0,(LPSOCKADDR) &cliaddr,  &sin_size);
			if (n > 0)
			{
				mesg[n] = '\0';
				mRecvStr.Format("%s", mesg);
				mRecvBool = FALSE;
			}
		}
	}
	return CWinThread::Run();
}

[Richard.J]

inside your while-loop, use select() with a timeout. That way, you can also get rid of the Sleep().

if select() returns, either there is some data to be received or the timeout occurred.

HTH,
Richard

[zagaa]

Thank you i used select. it works good. Thank you agian.

sincerely
zagaa