TSPI_phoneGetVolume function (tspi.h)

The TSPI_phoneGetVolume function returns the volume setting of the specified phone's hookswitch device.

Syntax

LONG TSPIAPI TSPI_phoneGetVolume(
  HDRVPHONE hdPhone,
  DWORD     dwHookSwitchDev,
  LPDWORD   lpdwVolume
);

Parameters

hdPhone

The handle to the phone containing the hookswitch device whose volume setting is to be retrieved.

dwHookSwitchDev

Identifies a single hookswitch device whose volume level is queried. This parameter uses one of the PHONEHOOKSWITCHDEV_ constants.

lpdwVolume

A pointer to a DWORD-sized location into which the service provider writes the current volume setting 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.

Return value

Returns zero if the function succeeds, or 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

PHONECAPS

TSPI_phoneGetDevCaps

TSPI_phoneSetVolume