graphics disappear during serial port access in seperate thread, only under WinXP

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#15186

From: Bruce Larrabee
Date: Fri, 18 Jul 2003 06:37

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	I'm using draw methods like MoveTo and LineTo to draw on a Canvas.
	
	I'm recieving data through a serial port from a digitizer. The port is 
in a seperate thread.

	Under WindowsXP, after the first byte comes in from the serial port all 
the graphics drawn on the Canvas disapear and it is no longer possible 
to draw to the Canvas. (you can draw but nothing ever appears again)

	No other part of the program seems to be affected. For example the data 
from the serial port still appears in the status bar, in real time.

	There has never been any problem using Win98 or Win95.

	Can anyone help?


	Bruce Larrabee

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