phoneGetVolume

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 
);

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.

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.

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

Last updated on Saturday, April 10, 2004

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