TSPI_phoneGetGain (Windows Embedded CE 6.0)

1/6/2010

This function returns the gain setting of the microphone of the specified phone's hookswitch device.

Syntax

LONG TSPIAPI TSPI_phoneGetGain(
  HDRVPHONE hdPhone, 
  DWORD dwHookSwitchDev,  
  LPDWORD lpdwGain 
);

dwHookSwitchDev
Hookswitch device whose gain level is queried. This parameter may be one and only one of thePHONEHOOKSWITCHDEV constants.

lpdwGain
Pointer to a DWORD-sized location into which the service provider writes the current gain setting of the hookswitch microphone component. The dwGain gain parameter specifies the 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 gain settings in this range are service provider-specific.

Returns zero if the function succeeds, or an error number if an error occurs. The following table shows the return values for this method.

Value	Description
PHONEERR_INVALPHONEHANDLE	The handle to the phone is invalid.
PHONEERR_RESOURCEUNAVAIL	The resource is unavailable.
PHONEERR_INVALPHONESTATE	The phone state is invalid.
PHONEERR_OPERATIONFAILED	The operation failed.
PHONEERR_INVALHOOKSWITCHDEV	The hookswitch device is invalid.
PHONEERR_OPERATIONUNAVAIL	The operation is unavailable.
PHONEERR_NOMEM	Not enough memory is available.