pmmformatinfo (PMMFORMATINFO) - input

Indicates a specific IOProc that is to be queried on the basis of whether the fccIOProc field or the ulMediaType field or both are specified in the structure. If neither is set, all I/O procedures are counted (queried).

plNumFormats (PLONG) - output

Pointer to a LONG. Returns the number of formats supported.

ulReserved (ULONG) - input

Reserved for future use and must be set to zero.

ulFlags (ULONG) - input

Reserved for future use and must be set to zero.

rc (ULONG) - returns

Return codes indicating success or type of failure:

MMIO_SUCCESS

If the function succeeds, 0 is returned.
MMIO_ERROR
The function failed for a reason different from any of the following returns in this list.
MMIOERR_INVALID_PARAMETER
An invalid parameter was passed.
MMIOERR_INTERNAL_SYSTEM
An internal system error occurred.

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