phoneGetGain (Windows CE 5.0)

Send Feedback

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

Note   This function is for TAPI version 2.0 and later.

LONG WINAPI phoneGetGain(HPHONE hPhone,DWORD dwHookSwitchDev,LPDWORD lpdwGain);

Parameters

  • hPhone
    Handle to the open phone device.
  • dwHookSwitchDev
    Hookswitch device whose gain level is queried. The dwHookSwitchDev parameter can have only one bit set. This parameter uses one and only one of the PHONEHOOKSWITCHDEV constants.
  • lpdwGain
    Pointer to a DWORD containing the current gain setting of the hookswitch microphone component. The dwGain parameter specifies the volume 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.

Return Values

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

Value Description
PHONEERR_INVALPHONEHANDLE The handle to the open phone device is invalid.
PHONEERR_NOMEM Not enough memory is available.
PHONEERR_INVALPOINTER The pointer is invalid.
PHONEERR_RESOURCEUNAVAIL The resources are unavailable.
PHONEERR_INVALPHONESTATE The phone state is invalid.
PHONEERR_OPERATIONFAILED The operation failed.
PHONEERR_INVALHOOKSWITCHDEV The hookswitch device is invalid.
PHONEERR_UNINITIALIZED A parameter is uninitialized.
PHONEERR_OPERATIONUNAVAIL The operation is unavailable.

Requirements

OS Versions: Windows CE 3.0 and later.
Header: Tapi.h.
Link Library: Coredll.lib.

Send Feedback on this topic to the authors

Feedback FAQs

© 2006 Microsoft Corporation. All rights reserved.