Retrieving an individual pixel color from a bitmap.

I am working with an application in which the bitmaps need to be drawn transparently (one color is not drawn) so that they will match whatever background they are on.  I have the transparency functionality working and now would like to modify it to select one of the corner pixels to be the color that is removed.  Currently I am hard coding the value of the color I don't want drawn.  I am looking for a method of retrieving a pixel color from a bitmap given a handle to the bitmap.
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// Given HBITMAP hBmp, get clr

HDC hMemDC = ::CreateCompatibleDC(NULL);

HBITMAP hOldBmp = ::SelectObject(hMemDC, hBmp);

COLORREF clr = ::GetPixel(hMemDC, x, y);

::SelectObject(hMemDC, hOldBmp);


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