VC.NET: "import" some pixels from underneath a window

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Wolfgang - 23 Jan 2005 23:28 GMT

In VC or VC++, suppose I have a simple window (a form). Is it
possible from that window to "see" what's underneath a particular
pixel?

Basically, I want to "import" some pixels underneath my window,
depending on color (or some other, similar properties).
For example, say I want to incorporate and display all green pixels
that may be underneath my window.

Can this be done? Thanks for any links or other information about
this.

Wolfgang
Goleta, CA

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Tim Robinson - 23 Jan 2005 23:49 GMT

> In VC or VC++, suppose I have a simple window (a form). Is it
> possible from that window to "see" what's underneath a particular
> pixel?

[...]

Not directly. The pixels that make up a window cease to exist they are
obscured.

However, you may have some luck with the WM_PRINT message, assuming
you're using Windows XP. Sending this message asks a window to draw
itself into a DC that you provide.

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Tim Robinson (MVP, Windows SDK)
http://mobius.sourceforge.net/

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