Hidden window problem on Linux

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Scaremonger

(Posted 2012) [#1]

Please see discussion here:
http://www.blitzbasic.com/Community/posts.php?topic=98100

I've found a bug that affects Linux (I'm using Ubuntu) but not Windows.

The following piece of code produces a "Segmentation Fault" when you execute it caused by the attribute WINDOW_HIDDEN.

Strict
Import MaxGui.Drivers

Local window:TGadget = CreateWindow( "", 100, 100, 225, 400, Null, WINDOW_TITLEBAR | WINDOW_CENTER | WINDOW_CLIENTCOORDS | WINDOW_HIDDEN )
Local canvas:TGadget = CreateCanvas(1, 1, ClientWidth(window), ClientHeight(window), window)

Attempting to work around this using Hidegadget() produces a different error.

Take a look at this working code and then run it again after uncommenting the HIDEGADGET()/SHOWGADGET() lines:

Strict
Import MaxGui.Drivers

Local window:TGadget = CreateWindow( "", 100, 100, 225, 200, Null, WINDOW_TITLEBAR | WINDOW_CENTER | WINDOW_CLIENTCOORDS )
Local canvas:TGadget = CreateCanvas(1, 1, ClientWidth(window), ClientHeight(window), window)

'HideGadget( window)
'ShowGadget( window)
Repeat
	WaitEvent()
	Select EventID()
		Case EVENT_WINDOWCLOSE
			End
		Case EVENT_GADGETPAINT
	  		SetGraphics CanvasGraphics (canvas)
    			DrawRect  20,20,50,80
        	Flip
	End Select
Forever
End

It produces the following error:

X Error of failed request:  BadDrawable (invalid Pixmap or Window parameter)
  Major opcode of failed request:  14 (X_GetGeometry)
  Resource id in failed request:  0x2e00007
  Serial number of failed request:  110
  Current serial number in output stream:  110

BLITZMAX: 1.45 and 1.48
UBUNTU: 11.10

Grisu

(Posted 2012) [#2]

Confirmed under Ubuntu 12.04 LTS (32-Bit). :(