Generating Four-Character Codes

You can use the mmioFOURCC1L6PT8P macro or the mmioStringToFOURCCCIE05U function to generate four-character codes. The following example uses mmioFOURCC to generate a four-character code for  WAVE .

FOURCC fourccID;

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fourccID = mmioFOURCC('W', 'A', 'V', 'E');

The following example uses mmioStringToFOURCCCIE05U to generate a four-character code for  WAVE .

FOURCC fourccID;

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fourccID = mmioStringToFOURCC("WAVE", 0);

The second parameter in mmioStringToFOURCCCIE05U specifies flags for converting the string to a four-character code. If you specify the MMIO_TOUPPER flag, mmioStringToFOURCC converts all alphabetic characters in the string to uppercase. This is useful when you need to specify a four-character code to identify a custom I/O procedure because four-character codes identifying file-extension names must be all uppercase.