MMIOM_OPEN

The MMIOM_OPEN message is sent to an I/O procedure by the mmioOpen function to request that a file be opened or deleted.

MMIOM_OPEN

lParam1 = (LPARAM) lpszFileName

lParam2 = reserved

Parameters
lpszFileName

Null-terminated string containing the name of the file to open.

lParam2

Reserved.

Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following:

MMIOM_CANNOTOPEN	The file could not be opened.
MMIOM_OUTOFMEMORY	Not enough memory to perform the operation.

Remarks
The dwFlags member of the MMIOINFO structure contains flags passed to the mmioOpen function.

The lDiskOffset member of the MMIOINFO structure is initialized to zero. If this value is incorrect, the I/O procedure must correct it.

If the application passed an MMIOINFO structure to mmioOpen, the return value is returned in the wErrorRet member.