phoneSetGain (Compact 2013)

3/26/2014

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

Syntax

LONG WINAPI phoneSetGain(
  HPHONE hPhone,
  DWORD dwHookSwitchDev,
  DWORD dwGain 
);

Parameters

• hPhone
  Handle to the open phone device. The application must be the owner of the phone.

• dwHookSwitchDev
  Hookswitch device whose microphone's gain is to be set. This parameter uses one and only one of the PHONEHOOKSWITCHDEV constants.

• dwGain
  Pointer to a DWORD containing the new gain setting of the device. The dwGain parameter specifies the gain level of the hookswitch device. This is a number in the range 0x00000000 (silence) to 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 set to the nearest value in the range.

Return Value

Returns a positive request identifier if the function is completed asynchronously or a negative error number if an error occurs. The dwParam2 parameter of the corresponding PHONE_REPLY message is zero if the function succeeds or it is a negative error number if an error occurs. The following table shows the return values for this function.

Requirements

See Also

Reference

TAPI Phone Device Functions