auxGetVolume

The auxGetVolume function retrieves the current volume setting of the specified auxiliary output device.

MMRESULT auxGetVolume(
  UINT uDeviceID,     
  LPDWORD lpdwVolume  
);

Parameters

uDeviceID
Identifier of the auxiliary output device to be queried.
lpdwVolume
Address of a variable to be filled with the current volume setting. The low-order word of this location contains the left channel volume setting, and the high-order word contains the right channel setting. A value of 0xFFFF represents full volume, and a value of 0x0000 is silence.

If a device does not support both left and right volume control, the low-order word of the specified location contains the volume level.

The full 16-bit setting(s) set with the auxSetVolume function are returned, regardless of whether the device supports the full 16 bits of volume-level control.

Return Values

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

Value Description
MMSYSERR_BADDEVICEID Specified device identifier is out of range.

Remarks

Not all devices support volume control. To determine whether a device supports volume control, use the AUXCAPS_VOLUME flag to test the dwSupport member of the AUXCAPS structure (filled by the auxGetDevCaps function).

To determine whether a device supports volume control on both the left and right channels, use the AUXCAPS_LRVOLUME flag to test the dwSupport member of the AUXCAPS structure (filled by auxGetDevCaps).

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.
  Import Library: Use winmm.lib.

See Also

Waveform Audio Overview, Waveform Functions, auxSetVolume, AUXCAPS, auxGetDevCaps