The acmFormatDetails function queries the ACM for format details for a specific waveform-audio format tag.

MMRESULT acmFormatDetails(
  HACMDRIVER had,           
  DWORD fdwDetails          



Handle to the ACM driver to query for waveform-audio format details for a format tag. If this parameter is NULL, the ACM uses the details from the first suitable ACM driver.


Pointer to an ACMFORMATDETAILS structure to contain the format details for the given format tag.


Flags for getting the waveform-audio format tag details. The following values are defined.

Value Meaning
ACM_FORMATDETAILSF_FORMAT A WAVEFORMATEX structure pointed to by the pwfx member of the ACMFORMATDETAILS structure was given and the remaining details should be returned. The dwFormatTag member of the ACMFORMATDETAILS structure must be initialized to the same format tag as pwfx specifies. This query type can be used to get a string description of an arbitrary format structure. If an application specifies an ACM driver handle for had, details on the format will be returned for that driver. If an application specifies NULL for had, the ACM finds the first acceptable driver to return the details.
ACM_FORMATDETAILSF_INDEX A format index for the format tag was given in the dwFormatIndex member of the ACMFORMATDETAILS structure. The format details will be returned in the structure defined by pafd. The index ranges from zero to one less than the cStandardFormats member returned in the ACMFORMATTAGDETAILS structure for a format tag. An application must specify a driver handle for had when retrieving format details with this flag. For information about which members should be initialized before calling this function, see the ACMFORMATDETAILS structure.

Return Values

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

Value Description
ACMERR_NOTPOSSIBLE The details requested are not available.
MMSYSERR_INVALFLAG At least one flag is invalid.
MMSYSERR_INVALHANDLE The specified handle is invalid.
MMSYSERR_INVALPARAM At least one parameter is invalid.


  Windows NT/2000/XP: Included in Windows NT 3.1 and later.
  Windows 95/98/Me: Included in Windows 95 and later.
  Header: Declared in Msacm.h.
  Library: Use Msacm32.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT/2000/XP.

See Also

Audio Compression Manager, Audio Compression Functions, WAVEFORMATEX, ACMFORMATTAGDETAILS