wpclsQueryIconData Return Value - ulReturn

ulReturn (ULONG) - returns

Buffer size or number of bytes required to hold the output data.

Depending of the contents of the pIconInfo parameter, ulReturn contains one of the following:

pIconInfo

ulReturn
NULL
Number of bytes required to hold the output data for this class.
Not NULL
Number of bytes written into the buffer.
If ulReturn is 0, an error occurred.

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