Erasing The Background

Hi EveryBody.


I'm writing a code to capture the stylus motion on the screen of the PDA, I'm drawing a window using a null brush because I want this window transparent window, this window has a rounded rectangle, the problem appears when I move the window the boundaries in the old position still appear, I want to erase these boundaries in the old position.


Can you help me in this problem?

Thank you.
MAnkeerAsked:
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jhshuklaCommented:
i think you will have to send redraw message to all visible windows other than yours.
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MAnkeerAuthor Commented:
How can I do that?
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jhshuklaCommented:
here is how you get window handles: http://msdn.microsoft.com/msdnmag/issues/02/07/CQA/
then you send a WM_PAINT message to all those windows using either SendMessage or PostMessage. note that SendMessage and PostMessage are part of unmanaged API and can't be called as easily from managed code. read http://msdn2.microsoft.com/en-us/library/26thfadc.aspx on how to call funcs in unmanaged DLLs from managed code.
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jhshuklaCommented:
btw you only need to send messages to visible windows but it would take a lot of effort to detemine which windows need to be redrawn. just redraw all of them and if you don't have a picture that took forever to render the difference would be pretty much unnoticeable.
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