How to receive continous UDP data packet from the server?

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Hallo evryone i am new in network programming.
Can anyone please help me to find a solution for this problem.
I would like to get continuous data packets form the server side, but i am always stuck with assert functions in the program.
So at a time i receive only one data packet,
I have done this with multithreading process.
I am not able to distinguish the error

Cheers!

What I have tried:

iLen = m_clientSocket.Receive(pBuf, 1024); //Receieve Data packet
	if (iLen == SOCKET_ERROR)
	{
		AfxMessageBox(L"Could not Recieve");
		return;
			}
			else
			{
				
				/*if (iLen == sizeof(struct udp_tackpacket_t))
				{
					struct udp_tackpacket_t* pstrFrame;
					pstrFrame = (struct udp_tackpacket_t*)pBuf;

					m_sharedData.szCounter.Format(_T("%d"), pstrFrame->header.counter);

				}*/

				pBuf[iLen] = NULL;
				strData = pBuf;
		m_data.Insert(m_data.GetLength(), strData);   //display in server
		UpdateData(FALSE);
		//int strdatalength = iLen;;
		//m_clientSocket.Send(strData, iLen);
		//UpdateData(FALSE)

Posted 2-Jul-19 22:36pm

Member 14499788

Updated 3-Jul-19 3:56am

v2

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Richard MacCutchan 3-Jul-19 5:34am

You cannot guarantee receipt of UDP messages as they are like broadcasts. They are sent by the server but no checks are made to ensure either successful delivery or sending in the correct order.

If you Google for "socket sample" you will find lots of examples of how to do it correctly.

Member 14499788 3-Jul-19 7:00am

Yeah , thanks for the suggestion!
I tried doing it many ways form internet.The main problem is I am not able to receive a continuosus udp packet. The programm stops after reciving one data packet

Richard MacCutchan 3-Jul-19 7:57am

As each message is received you add the data to your current receive buffer and examine it to see where a server message starts and ends. The only problem is that UDP packets are not guaranteed, and may even arrive in the wrong order, so it becomes quite difficult to manage.

Member 14499788 3-Jul-19 8:02am

Thanks!!

CPallini 3-Jul-19 8:44am

Why it stops? What assertion fails? Please give more details.

Member 14499788 3-Jul-19 9:00am

m_clientSocket.Create(7000, SOCK_DGRAM, FD_READ, NULL);
if (m_clientSocket.Connect(L"172.16.2.91", m_UDP_Port))
{
AfxMessageBox(L"Connection Successfull");
return;
}
else
{
AfxMessageBox(L"Connection Failed");
}
DWORD error = GetLastError();
This is the code before that,
Assert fucntion shows a error near the create and send fucntions in the program

CPallini 3-Jul-19 9:36am

Why do you create a socket for each datagram?

Member 14499788 3-Jul-19 9:44am

i have created just a single socket objec

CPallini 3-Jul-19 9:47am

The code you posted calls the Create method. You're complaining it fails
when executing the second time...

Member 14499788 3-Jul-19 9:49am

Yes thats the issue But i am not able to figure it out

Member 14499788 3-Jul-19 7:02am

In my project, I would like to measure the continuous data form the UDP packet

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CPallini · Accepted Answer · 2019-07-03T03:57:00

Solution 1

Have a look at this code samples: MFC Sockets[^].
Have also a look at this CodePrject article: Sending & Receiving UDP Datagrams with MFC's CAsyncSocket C++ Class[^].

Posted 3-Jul-19 3:57am

CPallini

Comments

Member 14499788 5-Jul-19 2:09am

Hai CPallini
Thankyou for the suggestion.
my program works perfectly:):)

CPallini 5-Jul-19 2:45am

You are welcome.