wpQueryIconData 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.
Not NULL
Number of bytes written into the buffer.
If ulReturn is 0, an error occurred.

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