function sets the hook state of the specified open phone's hookswitch devices
to the specified mode. Only the hookswitch state of the hookswitch devices
listed is affected.
| HPHONE hPhone,
| DWORD dwHookSwitchDevs,
| DWORD dwHookSwitchMode
A handle to the open phone device. The application must be the owner of the
The device or devices whose hookswitch mode is to be set. This parameter uses
the following PHONEHOOKSWITCHDEV_ constants:
The phone's handset.
The phone's speakerphone or adjunct.
The phone's headset.
The hookswitch mode to set. The dwHookSwitchMode
parameter can have only a single bit set. This parameter uses the following
The device's microphone and speaker are both onhook.
The device's microphone is active, the speaker is mute.
The device's speaker is active, the microphone is mute.
The device's microphone and speaker are both active.
Returns a positive request ID if the function will be completed asynchronously
or a negative error number if an error has occurred. The dwParam2
parameter of the corresponding PHONE_REPLY
message is zero if the function is successful or it is a negative error
number if an error has occurred. Possible return values are:
PHONEERR_INVALPHONEHANDLE, PHONEERR_OPERATIONUNAVAIL, PHONEERR_NOTOWNER,
PHONEERR_NOMEM, PHONEERR_INVALHOOKSWITCHDEV, PHONEERR_RESOURCEUNAVAIL,
PHONEERR_INVALHOOKSWITCHMODE, PHONEERR_OPERATIONFAILED, PHONEERR_INVALPHONESTATE,
The hookswitch mode is the same for all devices specified. If different
settings are desired, this function can be invoked multiple times with a different
set of parameters. A PHONE_STATE message is sent to the application after the
hookswitch state has changed.
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