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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.

Note

This function is for TAPI version 2.0 and later.

Syntax

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 Value

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

Header tapi.h
Library coredll.lib
Windows Embedded CE Windows CE 3.0 and later

See Also

Concepts

TAPI Phone Device Functions