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Thread: CreateCompatibleBitmap()

  1. Feb 25th, 2003, 10:53 PM #1
    jmiller
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    CreateCompatibleBitmap()

    Is it okay to pass zero to this function as the hdc? I've seen some bitmap classes that load an image using LoadImage, and then create an hdc using CreateCompatibleDC, put 0 is passed to this function. I've also seen a blank bitmap created using CreateCompatibleBitmap(), and then the DC is created using CreateCompatibleDC(), but a value is required other than zero. What is the purpose of passing a value to CreateCompatibleDC()? When and when can't 0 be used?

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    jmiller
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  2. Feb 26th, 2003, 04:52 PM #2
    CornedBee
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    You can pass NULL, but then you'll get a black/white bitmap/dc. The value passed to the two functions is the dc that the new object should be compatible to.
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