acmFormatTagEnum

	Overview

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	Quick Info

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

MMRESULT acmFormatTagEnum(

HACMDRIVER had,
LPACMFORMATTAGDETAILS paftd,
ACMFORMATTAGENUMCB fnCallback,
DWORD dwInstance,
DWORD fdwEnum
);

Parameters
had

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

paftd

Address of the ACMFORMATTAGDETAILS structure that is to receive the format tag details passed to the function specified in fnCallback. This structure must have the cbStruct member of the ACMFORMATTAGDETAILS structure 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 format 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.