acmFormatTagEnum

The acmFormatTagEnum function enumerates waveform-audio format tags available from an ACM driver. This function continues enumerating until there are no more suitable format tags or the callback function returns FALSE.

MMRESULT acmFormatTagEnum(
  HACMDRIVER had,               
  LPACMFORMATTAGDETAILS paftd,  
  ACMFORMATTAGENUMCB fnCallback,  
  DWORD dwInstance,             
  DWORD fdwEnum                 
);

Parameters

had
Handle of the ACM driver to query for waveform-audio format tag details. If this parameter is NULL, the ACM uses the details from the first suitable ACM driver.
paftd
Address of the ACMFORMATTAGDETAILS structure that is to receive the format tag details passed to the function specified in fnCallback. This structure must have the cbStruct member of the ACMFORMATTAGDETAILS structure initialized.
fnCallback
Procedure instance address of the application-defined callback function.
dwInstance
A 32-bit application-defined value that is passed to the callback function along with ACM format tag details.
fdwEnum
Reserved; must be zero.

Return Values

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

Value Description
MMSYSERR_INVALFLAG At least one flag is invalid.
MMSYSERR_INVALHANDLE The specified handle is invalid.
MMSYSERR_INVALPARAM At least one parameter is invalid.

Remarks

This function will return MMSYSERR_NOERROR (zero) if no suitable ACM drivers are installed. Moreover, the callback function will not be called.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in msacm.h.
  Import Library: Use msacm32.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT.

See Also

Audio Compression Manager Overview, Audio Compression Functions, ACMFORMATTAGDETAILS