[ROOT] How to test 'openess' of a Window?

From: Thomas Gotz (Thomas.Gotz@cern.ch)
Date: Mon Jul 03 2000 - 12:59:19 MEST


Hi ROOT'ers 

I'm working on a GUI for a DAQ, and I have some trouble with the 
window managers (X11) "Close" and/or "Delete" button. The question is, 
how do I know of the user has closed, say a canvas, or some TGMainFrame,
by using the "Close" and/or "Delete" button. The point is that I need to
make sure that I don't reference any window which isn't there! 

Thanks, 

Thomas



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