|
phoneGetVolume
The phoneGetVolume function returns the volume setting of the specified phone's hookswitch
device.
LONG phoneGetVolume(
HPHONE hPhone,
|
| DWORD dwHookSwitchDev,
|
| LPDWORD lpdwVolume
|
| );
|
|
Parameters
hPhone
A handle to the open phone device.
dwHookSwitchDev
A single hookswitch device whose volume level is queried. This parameter uses
the following PHONEHOOKSWITCHDEV_ constants:
PHONEHOOKSWITCHDEV_HANDSET
This is the phone's handset.
PHONEHOOKSWITCHDEV_SPEAKER
This is the phone's speakerphone or adjunct.
PHONEHOOKSWITCHDEV_HEADSET
This is the phone's headset.
lpdwVolume
A pointer to a DWORD-sized location containing the current volume setting of
the hookswitch device. dwVolume specifies the volume level of the hookswitch device. This is a number in the
range 0x00000000 (silence) to 0x0000FFFF (maximum volume). The actual
granularity and quantization of volume settings in this range are service-provider
specific.
Return Values
Returns zero if the request is successful or a negative error number if an
error has occurred. Possible return values are:
PHONEERR_INVALPHONEHANDLE, PHONEERR_NOMEM, PHONEERR_INVALPHONESTATE,
PHONEERR_RESOURCEUNAVAIL, PHONEERR_INVALPOINTER, PHONEERR_OPERATIONFAILED,
PHONEERR_INVALHOOKSWITCHDEV, PHONEERR_UNINITIALIZED, PHONEERR_OPERATIONUNAVAIL.
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