acmFilterTagEnum

	Overview

	Group

	Quick Info

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

MMRESULT acmFilterTagEnum(

HACMDRIVER had,
LPACMFILTERTAGDETAILS paftd,
ACMFILTERTAGENUMCB fnCallback,
DWORD dwInstance,
DWORD fdwEnum
);

Parameters
had

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

paftd

Address of the ACMFILTERTAGDETAILS structure that contains the filter tag details when it is passed to the fnCallback function. When your application calls acmFilterTagEnum, the cbStruct member of this structure must be 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 filter tag details.

fdwEnum

Reserved; must be zero.

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

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.