TSPI_phoneSetVolume function (tspi.h)

The TSPI_phoneSetVolume function sets the volume of the speaker component of the specified hookswitch device to the specified level.

Syntax

LONG TSPIAPI TSPI_phoneSetVolume(
  DRV_REQUESTID dwRequestID,
  HDRVPHONE     hdPhone,
  DWORD         dwHookSwitchDev,
  DWORD         dwVolume
);

Parameters

dwRequestID

The identifier of the asynchronous request.

hdPhone

The handle to the phone containing the speaker whose volume is to be set.

dwHookSwitchDev

Identifies the hookswitch device whose speaker's volume is to be set. This parameter uses one of the PHONEHOOKSWITCHDEV_ constants.

dwVolume

A DWORD specifying the new volume level of the hookswitch device. This is a number in the range from 0x00000000 (silence) through 0x0000FFFF (maximum volume). The actual granularity and quantization of volume settings in this range are service-provider specific. A value for dwVolume that is out of range is clamped by TAPI to the nearest value in range.

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.

Remarks

None.

Requirements

   
Target Platform Windows
Header tspi.h

See also

ASYNC_COMPLETION

PHONECAPS

PHONEHOOKSWITCHDEV_ Constants

TSPI_phoneGetDevCaps