|
phoneSetGain
The phoneSetGain function sets the gain of the microphone of the specified hookswitch device
to the specified gain level.
LONG phoneSetGain(
HPHONE hPhone,
|
| DWORD dwHookSwitchDev,
|
| DWORD dwGain
|
| );
|
|
Parameters
hPhone
A handle to the open phone device. The application must be the owner of the
phone.
dwHookSwitchDev
The hookswitch device whose microphone's gain is to be set. The dwHookswitchDev parameter can only have a single bit set. This parameter uses the following
PHONEHOOKSWITCHDEV_ constants:
PHONEHOOKSWITCHDEV_HANDSET
The phone's handset.
PHONEHOOKSWITCHDEV_SPEAKER
The phone's speakerphone or adjunct.
PHONEHOOKSWITCHDEV_HEADSET
The phone's headset.
dwGain
A pointer to a DWORD-sized location containing the current gain setting of the
device. The dwGain parameter specifies the gain level of the hookswitch device. This is a number
in the range 0x00000000 (silence) to 0x0000FFFF (maximum volume). The actual
granularity and quantization of gain settings in this range are service-provider
specific. A value for dwGain that is out of range is set to the nearest value in the range.
Return Values
Returns a positive request ID if the function will be completed asynchronously
or a negative error number if an error has occurred. The dwParam2 parameter of the corresponding PHONE_REPLY message is zero if the function is
successful or it is a negative error number if an error has occurred. Possible
return values are:
PHONEERR_INVALPHONEHANDLE, PHONEERR_NOMEM, PHONEERR_NOTOWNER,
PHONEERR_RESOURCEUNAVAIL, PHONEERR_INVALPHONESTATE, PHONEERR_OPERATIONFAILED,
PHONEERR_INVALHOOKSWITCHDEV, PHONEERR_UNINITIALIZED, PHONEERR_OPERATIONUNAVAIL.
See Also
PHONE_REPLY
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