TSPI_phoneSetGain function (tspi.h)

The TSPI_phoneSetGain function sets the gain of the microphone of the specified hookswitch device to the specified gain level.

Syntax

LONG TSPIAPI TSPI_phoneSetGain(
  DRV_REQUESTID dwRequestID,
  HDRVPHONE     hdPhone,
  DWORD         dwHookSwitchDev,
  DWORD         dwGain
);

Parameters

dwRequestID

The identifier of the asynchronous request.

hdPhone

The handle to the phone containing the hookswitch device whose gain is to be set.

dwHookSwitchDev

The hookswitch device whose microphone's gain is to be set. This parameter uses one and only one of the PHONEHOOKSWITCHDEV_ Constants.

dwGain

A DWORD-sized location containing the desired new gain setting of the device. This is a number in the range from 0x00000000 (silence) through 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 clamped by TAPI to the nearest in-range value.

Return value

Returns dwRequestID, or an error number if an error occurs. The lResult actual parameter of the corresponding ASYNC_COMPLETION is zero if the function succeeds or it is an error number if an error occurs. Possible return values are as follows:

PHONEERR_INVALPHONEHANDLE, PHONEERR_RESOURCEUNAVAIL, PHONEERR_INVALPHONESTATE, PHONEERR_OPERATIONFAILED, PHONEERR_INVALHOOKSWITCHDEV, PHONEERR_OPERATIONUNAVAIL, PHONEERR_NOMEM.

Requirements

See also

ASYNC_COMPLETION

PHONECAPS

TSPI_phoneGetDevCaps