How do I get the parameters I need when I request a file from the clipboard?

[kimcoldwater]

hello,

In a file clipboard request, you want to obtain a FILEDESCRIPTOW* structure from ServerFormatDataResponse and use the value to create a CLIPRDR_FILE_CONTENTS_REQUEST structure to send a ClientFileContentsRequest.

I would like to know the formula for obtaining nPositionLow and nPositionHigh, cbRequested according to dwFlags of CLIPRDR_FILE_CONTENTS_REQUEST.

The dwFlags are usually 1 (FILECONTENTS_SIZE),
How can I calculate the file data from ServerFileContentsResponse?

	CLIPRDR_FILE_CONTENTS_REQUEST fileContentsRequest;

	fileContentsRequest.streamId = 
	fileContentsRequest.listIndex = 
	fileContentsRequest.dwFlags = 
	fileContentsRequest.nPositionLow = 
	fileContentsRequest.nPositionHigh = 
	fileContentsRequest.cbRequested = 
	fileContentsRequest.clipDataId = 
	fileContentsRequest.msgFlags = 

I want to fill this structure.

[akallabeth]

• File stream to use streamId
• File to request data from: listIndex (the index in the FILEDESCRIPTORW list you got)
• offset in file to read: nPositionLow and nPositionHigh
• size to read from file: cbRequested
• (optional) if clipboard is locked, set clipDataId to the ID of the lock

the rest is not to be touched on send, it will contain data if received. (success/failure/...)

check cliprdr_write_file_contents_request for a use of that.

[kimcoldwater]

Thank you. Thanks to your advice, I got the file.

Is this the right method to send the ClientFileContentsRequest as many as the number of divisions when requesting a split request?

[akallabeth]

sorry, what are you trying to ask?
you send a request for anything you´d like to get, it is up to you to divide the sizes each request returns. (with one exception, if the file is >4GB then you need to split as one request has limits)

[kimcoldwater]

For example, when I want to receive a file of 1GB and want to request a split of 100MB, I wonder if it is the right way to send 10 requests of 100MB each using nPositionLow, nPositioHigh, and cbRequested in ClientFileContentsRequest.

[akallabeth]

@kimcoldwater you´ll need to try out where your sweetspot between overhead and latency is. (e.g. if you request 100MB on your slow connection the transfer might not abort before the data is transferred even if you cancel the copy), but other than that, yes, that is the way.

[kimcoldwater]

OK, now the contents of the 'Server->Client' file are successfully imported and printed.
thank you.