The acmFilterDetails function queries the ACM for details about a filter with a specific waveform-audio filter tag.

MMRESULT acmFilterDetails(
  HACMDRIVER had,           
  DWORD fdwDetails          



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


Pointer to the ACMFILTERDETAILS structure that is to receive the filter details for the given filter tag.


Flags for getting the details. The following values are defined.

Value Meaning
ACM_FILTERDETAILSF_FILTER A WAVEFILTER structure pointed to by the pwfltr member of the ACMFILTERDETAILS structure was given and the remaining details should be returned. The dwFilterTag member of the ACMFILTERDETAILS structure must be initialized to the same filter tag pwfltr specifies. This query type can be used to get a string description of an arbitrary filter structure. If an application specifies an ACM driver handle for had, details on the filter 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_FILTERDETAILSF_INDEX A filter index for the filter tag was given in the dwFilterIndex member of the ACMFILTERDETAILS structure. The filter details will be returned in the structure defined by pafd. The index ranges from zero to one less than the cStandardFilters member returned in the ACMFILTERTAGDETAILS structure for a filter tag. An application must specify a driver handle for had when retrieving filter details with this flag. For information about what members should be initialized before calling this function, see the ACMFILTERDETAILS 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, WAVEFILTER, ACMFILTERTAGDETAILS