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acmFilterEnum
The acmFilterEnum function enumerates waveform-audio filters available for a given filter tag
from an ACM driver. This function continues enumerating until there are no more
suitable filters for the filter tag or the callback function returns FALSE.
MMRESULT acmFilterEnum(
HACMDRIVER had,
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| LPACMFILTERDETAILS pafd,
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| ACMFILTERENUMCB fnCallback,
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| DWORD dwInstance,
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| DWORD fdwEnum
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| );
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Parameters
had
Handle of the ACM driver to query for waveform-audio filter details. If this
parameter is NULL, the ACM uses the details from the first suitable ACM driver.
pafd
Address of the ACMFILTERDETAILS structure that contains the filter details when it is passed to the function
specified by fnCallback. When your application calls acmFilterEnum, the cbStruct, pwfltr, and cbwfltr members of this structure must be initialized. The dwFilterTag member must also be initialized to either WAVE_FILTER_UNKNOWN or a valid
filter tag.
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 details.
fdwEnum
Flags for enumerating the filters for a given filter tag. The following values
are defined:
ACM_FILTERENUMF_DWFILTERTAG
The dwFilterTag member of the WAVEFILTER structure pointed to by the pwfltr member of the ACMFILTERDETAILS structure is valid. The enumerator will enumerate only a filter that conforms
to this attribute. The dwFilterTag member of the ACMFILTERDETAILS structure must be equal to the dwFilterTag member of the WAVEFILTER structure.
Return Values
Returns zero if successful or an error otherwise. Possible error values
include the following:
ACMERR_NOTPOSSIBLE
| The details for the filter cannot be returned.
| MMSYSERR_INVALFLAG
| At least one flag is invalid.
| MMSYSERR_INVALHANDLE
| The specified handle is invalid.
| MMSYSERR_INVALPARAM
| At least one parameter is invalid.
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Remarks
The acmFilterEnum function will return MMSYSERR_NOERROR (zero) if no suitable ACM drivers are
installed. Moreover, the callback function will not be called.
The following functions should not be called from within the callback
function: acmDriverAdd, acmDriverRemove, and acmDriverPriority.
See Also
WAVEFILTER, ACMFILTERDETAILS, acmDriverAdd, acmDriverRemove, acmDriverPriority
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