This message requests the format name from the IOProc and will be used by MMIO when processing mmioGetFormatName. This message does not require that any file be opened or referenced.

ulReserved (ULONG)

Not used. No MMIOINFO block is required for this message.

usMsg (USHORT)

Set to MMIOM_GETFORMATNAME.

lParam1 (LONG)

A pointer to a PSZ buffer that contains the format name to be returned.

lParam2 (LONG)

The expected size of the format name. The buffer passed in lParam1 must accommodate this size. If the format name is larger than the specified size, it is truncated to lParam2 bytes.

rc (ULONG)

• Upon successful completion, the number of bytes read into the buffer (size of format name) is returned.

• For a failure, 0 is returned.

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