phoneGetVolume (Compact 2013)
3/26/2014
This function returns the volume setting of the specified phone's hookswitch device.
Syntax
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 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_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
Header |
tapi.h |
Library |
TAPI32.dll |