update problem in WS_EX_TRANPARENT

Posted on 2005-04-16
Medium Priority
Last Modified: 2012-06-21

I am trying to create a tranparent window on top of other windows so I can draw and annotate on it. I used WS_EX_TRANSPARENT in creating the window. It works fine except when the window underneath changes (moved or repainted), the transparent window does not update itself. I have seen numerous people posting on the net saying that they have the same problem, but never got a satisfying answer. Is the answer that WS_EX_TRANSPARENT just does not work? If so, what's my other choice? Using layered window and set the alpha to 1% does not work since anything I draw on it will also show as transparent. I can also draw a transparent bitmap and the alpha value of the pixels individually, but I will still need a transparent background. Please help.

Question by:eschuang
  • 2
LVL 55

Expert Comment

by:Jaime Olivares
ID: 13799457
WS_EX_TRANSPARENT is most used in child windows to avoid them to paint inside other childs area. Not for frame windows.

Author Comment

ID: 13802731
ok. so what do you recommand using?
LVL 55

Accepted Solution

Jaime Olivares earned 500 total points
ID: 13819445

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