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mmioAscend function

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The mmioAscend function ascends out of a chunk in a RIFF file descended into with the mmioDescend function or created with the mmioCreateChunk function.

Syntax

MMRESULT mmioAscend(
   HMMIO      hmmio,
   LPMMCKINFO lpck,
   UINT       wFlags
);

Parameters

  • hmmio
    File handle of an open RIFF file.

  • lpck
    Pointer to an application-defined MMCKINFO structure previously filled by the mmioDescend or mmioCreateChunk function.

  • wFlags
    Reserved; must be zero.

Return value

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

Return code Description
MMIOERR_CANNOTSEEK

There was an error while seeking to the end of the chunk.
MMIOERR_CANNOTWRITE

The contents of the buffer could not be written to disk.

 

Remarks

If the chunk was descended into by using mmioDescend, mmioAscend seeks to the location following the end of the chunk (past the extra pad byte, if any).

If the chunk was created and descended into by using mmioCreateChunk, or if the MMIO_DIRTY flag is set in the dwFlags member of the MMCKINFO structure referenced by lpck, the current file position is assumed to be the end of the data portion of the chunk. If the chunk size is not the same as the value stored in the cksize member of the MMCKINFO structure when mmioCreateChunk was called, mmioAscend corrects the chunk size in the file before ascending from the chunk. If the chunk size is odd, mmioAscend writes a null pad byte at the end of the chunk. After ascending from the chunk, the current file position is the location following the end of the chunk (past the extra pad byte, if any).

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

 Mmsystem.h (include Windows.h)

Library

 Winmm.lib

DLL

 Winmm.dll