TSPI_phoneGetGain

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

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

Parameters

• hdPhone
  The handle to the phone whose gain is to be retrieved.
• dwHookSwitchDev
  The hookswitch device whose gain level is queried. This parameter may be one and only one of the PHONEHOOKSWITCHDEV_ Constants.
• lpdwGain
  A 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.

Return Values

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

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

TSPI_phoneGetDevCaps, TSPI_phoneSetGain

 Last updated on Tuesday, July 13, 2004

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