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waveOutGetVolume
The waveOutGetVolume function retrieves the current volume level of the specified waveform-audio
output device.
MMRESULT waveOutGetVolume(
HWAVEOUT hwo,
|
| LPDWORD pdwVolume
|
| );
|
|
Parameters
hwo
Handle of an open waveform-audio output device. This parameter can also be a
device identifier.
pdwVolume
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 mono volume level.
The full 16-bit setting(s) set with the waveOutSetVolume function is 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:
MMSYSERR_INVALHANDLE
| Specified device handle is invalid.
| MMSYSERR_NODRIVER
| No device driver is present.
| MMSYSERR_NOMEM
| Unable to allocate or lock memory.
| MMSYSERR_NOTSUPPORTED
| Function isn't supported.
|
Remarks
If a device identifier is used, then the result of the waveOutGetVolume call and the information returned in pdwVolume applies to all instances of the device. If a device handle is used, then the
result and information returned applies only to the instance of the device
referenced by the device handle.
Not all devices support volume changes. To determine whether the device
supports volume control, use the WAVECAPS_VOLUME flag to test the dwSupport member of the WAVEOUTCAPS structure (filled by the waveOutGetDevCaps function).
To determine whether the device supports left- and right-channel volume
control, use the WAVECAPS_LRVOLUME flag to test the dwSupport member of the WAVEOUTCAPS structure (filled by waveOutGetDevCaps).
Volume settings are interpreted logarithmically. This means the perceived
increase in volume is the same when increasing the volume level from 0x5000 to
0x6000 as it is from 0x4000 to 0x5000.
See Also
waveOutSetVolume, WAVEOUTCAPS, waveOutGetDevCaps
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