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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