canvas exists ?
BlitzPlus Forums/BlitzPlus Programming/canvas exists ?
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| Is there a way to determine whether or not a previously created canvas is still present. I have an application with several canvases open at once. Depending on the actions of the user, some may be freed at any time. I know I can check for various gadget events to keep track of windows/gadgets, but is there a way to see if a canvas is still in memory before I use a command like 'mousex(canvas)' - which will generate an error if that canvas no longer exists. Thanks. |
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| Well, if you create a canvas, then free it, you should make sure the handle is null (or 0), then you can do something like:- hCanvas = CreateCanvas(blah blah) FreeGadget hCanvas hCanvas = 0 If hCanvas <> 0 DoSomething() ;The canvas is alive and well Else MaybeDoSomethingElse() ;Bugger, its gone! End If That should do the trick! :) Dabz |
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