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phoneGetVolume (Windows CE 5.0)

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

Note   This function is for TAPI version 2.0 and later.

LONG WINAPI phoneGetVolume(HPHONE hPhone,DWORD dwHookSwitchDev,LPDWORD lpdwVolume);

Parameters

  • hPhone
    Handle to the open phone device.
  • dwHookSwitchDev
    A single hookswitch device whose volume level is queried. This parameter uses one of the PHONEHOOKSWITCHDEV constants.
  • lpdwVolume
    Pointer to a DWORD. The function returns the current volume setting of the hookswitch device in this location. This is a number in the range 0x00000000 (silence) to 0x0000FFFF (maximum volume). The actual granularity and quantization of volume 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_INVALPHONESTATE The phone state is invalid.
PHONEERR_RESOURCEUNAVAIL The resources are unavailable.
PHONEERR_INVALPOINTER The pointer 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.

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