Windows API Pixel Retrieval

quote:

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I want to get a pixel from the current screen being displayed.

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Do you want a pixel from the current screen or the active window? I'll assume you stated it correctly and are trying to get a pixel from the current screen.

Use GetPixel() like you were, but instead of using GetDesktopWindow() to retriece a HDC, use GetDC() and pass NULL/zero to retrieve the DC of the screen.

HDC hdcScreen = GetDC(0);
COLORREF rgbValue = GetPixel(hdcScreen, x, y);    

In answer to the first question, GetDesktopWindow() gets the DC for the Desktop (which is technically a window by all respects).

quote:

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I don't want to end up using GetPixel though, what I really want to know is a super fast way to get a pixel from the currently display screen.

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"super fast" just won't happen with Windows GDI.

Edited by - Steel on October 15, 2000 2:19:22 PM

If you want super-fast use DirectDraw.

If I use DirectDraw, I''ll have to first copy the screen to a surface and then get the pixel? I''m pretty sure that''d be slower. Even with assembly there''s no fast way? It doesn''t have to use the Windows API, it just has to be able to read from the screen displayed by Windows.

In DDraw, you''d just lock the primary surface and read the pixel from it. Locking takes a while though, so if you''re not doing anything else to the surface after you get the pixel, it wouldn''t be much faster.

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