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Searching for a RIFF Chunk

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[The feature associated with this page, Multimedia File I/O, is a legacy feature. It has been superseded by Source Reader. Source Reader has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader instead of Multimedia File I/O, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The following example uses the mmioDescend function to search for a "RIFF" chunk with a form type of "WAVE" to verify that the file that has just been opened is a waveform-audio file.

HMMIO    hmmio; 
MMCKINFO mmckinfoParent; 
MMCKINFO mmckinfoSubchunk; 
. 
. 
. 
// Locate a "RIFF" chunk with a "WAVE" form type to make 
// sure the file is a waveform-audio file. 
mmckinfoParent.fccType = mmioFOURCC('W', 'A', 'V', 'E'); 
if (mmioDescend(hmmio, (LPMMCKINFO) &mmckinfoParent, NULL, 
    MMIO_FINDRIFF)) 
    // The file is not a waveform-audio file. 
else 
    // The file is a waveform-audio file