acmFormatChooseW function (msacm.h)

Article
02/22/2024

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

Syntax

MMRESULT ACMAPI acmFormatChooseW(
  LPACMFORMATCHOOSEW pafmtc
);

Parameters

pafmtc

Pointer to an ACMFORMATCHOOSE structure that contains information used to initialize the dialog box. When this function returns, this structure contains information about the user's format selection.

The pwfx member of this structure must contain a valid pointer to a memory location that will contain the returned format header structure. Moreover, the cbwfx member must be filled in with the size, in bytes, of this memory buffer.

Return value

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

Return code	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 pwfx member of the ACMFORMATCHOOSE structure is too small to contain the selected format.
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 format selections.

Remarks

Note

The msacm.h header defines ACMFORMATCHOOSE as an alias which 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 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