function retrieves the current volume setting of a MIDI output device.
| HMIDIOUT hmo,
| LPDWORD lpdwVolume
Handle of an open MIDI output device. This parameter can also contain the
handle of a MIDI stream, as long as it is cast to HMIDIOUT
. This parameter can also be a device identifier.
Address of the location to contain 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.
Any value set by using the midiOutSetVolume
function is returned, regardless of whether the device supports that value.
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
||The specified device handle is invalid.
||The specified pointer or structure is invalid.
||The system is unable to allocate or lock memory.
||The function is not supported.
If a device identifier is used, then the result of the midiOutGetVolume
call and the information returned in lpdwVolume
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 control. You can determine whether a device
supports volume control by querying the device by using the midiOutGetDevCaps
function and specifying the MIDICAPS_VOLUME flag.
You can also determine whether the device supports volume control on both the
left and right channels by querying the device by using the midiOutGetDevCaps
function and specifying the MIDICAPS_LRVOLUME flag.
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