How do you make sense of the Xlib error reports?

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2 total messages Started by Stephen Riehm Fri, 24 Jul 1992 15:05

#43

Author: Stephen Riehm
Date: Fri, 24 Jul 1992 15:05

26 lines
1497 bytes

Hi,
	I am trying to write a program entirely in Xlib ( for
	performance reasons ), I am borrowing some code from a program
	that I wrote last year ( which I am pretty sure worked ), but
	when I run the program, I get the following error from Xlib:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  62 (X_CopyArea)
  Serial number of failed request:  73
  Current serial number in output stream:  150
Exit 1

	How do I track down EXACTLY what is going wrong, it seems that
	when XCopyArea is called, it returns with an OK status, and
	its only when the event requests are processed that the
	message is printed. Any advice would be gladly appreciated!

thanks in advance

-----------------------------------------------------------------
Stephen Riehm				   smr@pki-nbg.philips.de
not in any way talking on behalf of:
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8500 Nuremberg, Germany			    Fax: +49 911 526 2095
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PS: I know my From: line is wrong, but I don't know WHY!

Re: How do you make sense of the Xlib error reports?

#50

Author: Paul Davey
Date: Tue, 28 Jul 1992 13:31

23 lines
1489 bytes

>>>>> On 24 Jul 92 15:05:53 GMT, smr@iti.org (Stephen Riehm) said:

Stephen> 	How do I track down EXACTLY what is going wrong, it seems that
Stephen> 	when XCopyArea is called, it returns with an OK status, and
Stephen> 	its only when the event requests are processed that the
Stephen> 	message is printed. Any advice would be gladly appreciated!

Remember that Xlib is asynchronous. The error can only be detected on the
server and is returned like an event.

When debugging in X run in synchronous mode by calling
	XSynchronize(display, True) 
so that your errors will be reported immediately after the program issues
the request to XCopyArea.

NB. Your question would have been answered quicker in comp.windows.x, hence
    the Followup-To.

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	Paul Davey		  pd@ixi.uucp          62-74 Burleigh St.
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