How to send a picture with ClientTCPWrite

Hello

I would like to send a large picture (in fact a photo) to another computer via a TCP server.

I already use the library to Support TCP to send data to a software that is running on another computer and it works well.

So I did the same thing with an array of integers, and it does not work. I used the sample of Labwindows to send this table, and that the first part of the table is received aid.

I don't understand.

int SendImage(BYTE *lDataToWrite)

{

   	DWORD 	dwWaitResult;

	int bytesToWrite;

	int bytesWritten;

	int messageSize;
If (giTCPConnected1 is TRUE)

	{

		bytesToWrite = messageSize = sizeof (BYTE) * WIDTH * HEIGHT;

		While (bytesToWrite > 0)

		{

			bytesWritten = ClientTCPWrite (giTcpConnection1 & lDataToWrite [messageSize - bytesToWrite], bytesToWrite, 0);

			bytesToWrite = bytesWritten;

		}

	}
Return (ERROR_NO_ERROR);

}

	Tab WORD [WIDTH * HEIGHT];
...

	...

int CVICALLBACK ReceiveTcpMsg(unsigned hdl, int event, int error, void *callbackData) {}

	int		iDataSize;

	int 	i, j;
DWORD 	dwWaitResult;

	int bytesToRead;

	int bytesRead;
switch (event)

	{

		case TCP_CONNECT:

			giTcpConnection = hdl;

			giLineConnected = TRUE;

			break;
case TCP_DATAREADY:

			Reading data tcp/ip
bytesToRead = messageSize = sizeof (WORD) * WIDTH * HEIGHT;

			While (bytesToRead > 0)

			{

				bytesRead = ClientTCPRead (giTcpConnection, & Tab2 [messageSize - bytesToRead], bytesToRead, 0);

				bytesToRead = bytesRead;

			}
break;
case TCP_DISCONNECT:

		  	giLineConnected = FALSE;

			break;

	}

	Return (0);

}

Is that someone has already used these functions to a large size?

Or you know other ways to send a picture to another software?

Thank you for your help.

Benjamin

When I had to do something similar to your task, I found more comfortable to split the expedition into smaller pieces (more or less 3-4 k bytes of each for example).

It also gave me the ability to monitor the process of ethe and finally to interrupt.

Tags: NI Software

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