acmFormatTagEnumW function (msacm.h)
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.
Syntax
MMRESULT ACMAPI acmFormatTagEnumW(
HACMDRIVER had,
LPACMFORMATTAGDETAILSW paftd,
ACMFORMATTAGENUMCBW fnCallback,
DWORD_PTR dwInstance,
DWORD fdwEnum
);
Parameters
had
Handle to 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
Pointer to 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 64-bit (DWORD_PTR) or 32-bit (DWORD) application-defined value that is passed to the callback function along with ACM format tag details.
fdwEnum
Reserved; must be zero.
Return value
Returns zero if successful or an error otherwise. Possible error values include the following.
| Return code | Description |
|---|---|
|
At least one flag is invalid. |
|
The specified handle is invalid. |
|
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.
Note
The msacm.h header defines acmFormatTagEnum as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | msacm.h |
| Library | Msacm32.lib |
| DLL | Msacm32.dll |