phoneGetVolume
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4/8/2010
This function returns the volume setting of the specified phone's hookswitch device.
Note
This function is for TAPI version 2.0 and later.
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 | coredll.lib |
| Windows Embedded CE | Windows CE 3.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |