Inside Macintosh: Sound /

Chapter 2 - Sound Manager / Sound Manager Reference

Sound Manager Routines / Controlling Volume Levels

GetDefaultOutputVolume

You can use the GetDefaultOutputVolume function to determine the default volume of a sound output device.

FUNCTION GetDefaultOutputVolume (VAR level: LongInt): OSErr;

level

On exit, the default volume level of a sound output device.

DESCRIPTION

The GetDefaultOutputVolume function returns, in the level parameter, the default volume of a sound output device. The values returned in the high and low words of the level parameter range from 0 (silence) to $0100 (full volume).

SPECIAL CONSIDERATIONS

The GetDefaultOutputVolume function is available only in versions 3.0 and later of the Sound Manager. You can call this function at interrupt time.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the GetDefaultOutputVolume function are

Trap macro	Selector
_SoundDispatch	$022C0024

RESULT CODES

noErr

0

No error