GBM_SETBITMAPINDEX Field - usFrameCode

usFrameCode (USHORT)

Frame code.

GB_INDEX_FORWARD

Advance to next bitmap index in circular array.
GB_INDEX_BACKWARD
Set to previous bitmap index in circular array.
GB_INDEX_FIRST
Set to first bitmap index.
GB_INDEX_LAST
Set to last bitmap index.
desired_bit_map
Otherwise, use usFrameCode number as the bitmap index.

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