The acmFilterChoose function creates an ACM-defined dialog box that enables the user to select a waveform-audio filter.

MMRESULT acmFilterChoose(



Pointer to an ACMFILTERCHOOSE structure that contains information used to initialize the dialog box. When acmFilterChoose returns, this structure contains information about the user's filter selection.

The pwfltr member of this structure must contain a valid pointer to a memory location that will contain the returned filter header structure. The cbwfltr member must be filled in with the size, in bytes, of this memory buffer.

Return Values

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

Value Description
ACMERR_CANCELED The user chose the Cancel button or the Close command on the System menu to close the dialog box.
ACMERR_NOTPOSSIBLE The buffer identified by the pwfltr member of the ACMFILTERCHOOSE structure is too small to contain the selected filter.
MMSYSERR_INVALFLAG At least one flag is invalid.
MMSYSERR_INVALHANDLE The specified handle is invalid.
MMSYSERR_INVALPARAM At least one parameter is invalid.
MMSYSERR_NODRIVER A suitable driver is not available to provide valid filter selections.


  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, ACMFILTERCHOOSE