Read pixel color data from screen?

Hey all, I'm looking for a way to be able to read the color data at say pixel (0,5) on the screen and check it's color. Is there a way to do this that isn't window dependent? and if not, how do you do it? Thanks, John

GetPixel() on the DC.

Not the best idea.

Ok, I tried that, however I need to access the color of a pixel in a separate thread than the one that calls the function. Should I pass in HWND_TOPMOST for the hwnd parameter?

Give this a try with the code from your other post.

Code:

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__declspec(dllexport) LRESULT CALLBACK KeyboardEvent (int nCode, WPARAM wParam, LPARAM lParam)
{
    MOUSEHOOKSTRUCT * pMouseStruct = (MOUSEHOOKSTRUCT *)lParam;
    if (pMouseStruct != NULL)
        printf("Mouse position X = %d  Mouse Position Y = %d\n", pMouseStruct->pt.x,pMouseStruct->pt.y);

    HWND window = GetForegroundWindow();
    HDC hDC = GetDC(window);
    COLORREF rgb = GetPixel(hDC, pMouseStruct->pt.x, pMouseStruct->pt.y);
    COLORREF red = GetRValue(rgb);
    COLORREF green = GetGValue(rgb);
    COLORREF blue = GetBValue(rgb);
    printf("%02X %02X %02X\n",red,green,blue);
    return CallNextHookEx(hMouseHook,
        nCode,wParam,lParam);
}

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Actually guys, thanks for the help, but I found out how to get the handle to the window I was targetting anyway. Thanks :)