phoneSetHookSwitch

  • Article

This 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.

LONG WINAPI phoneSetHookSwitch(
  HPHONE hPhone,
  DWORD dwHookSwitchDevs,
  DWORD dwHookSwitchMode 
);

Parameters

  • hPhone
    Handle to the open phone device. The application must be the owner of the phone.
  • dwHookSwitchDevs
    Device or devices whose hookswitch mode is to be set. This parameter uses one and only one of the PHONEHOOKSWITCHDEV constants.
  • dwHookSwitchMode
    The hookswitch mode to set. This parameter uses one and only one of the PHONEHOOKSWITCHMODE constants.

Return Values

Returns a positive request identifier if the function is completed asynchronously or a negative error number if an error occurs. The dwParam2 parameter of the corresponding PHONE_REPLY message is zero if the function succeeds or it is 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_OPERATIONUNAVAIL The operation is unavailable.
PHONEERR_NOTOWNER The application is not an owner of this call.
PHONEERR_NOMEM Not enough memory is available.
PHONEERR_INVALHOOKSWITCHDEV The hookswitch device is invalid.
PHONEERR_RESOURCEUNAVAIL The resources are unavailable.
PHONEERR_INVALHOOKSWITCHMODE The hookswitch mode is invalid.
PHONEERR_OPERATIONFAILED The operation failed.
PHONEERR_INVALPHONESTATE The phone state is invalid.
PHONEERR_UNINITIALIZED A parameter is uninitialized.

Remarks

The hookswitch mode is the same for all specified devices. 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.

Note   This function is for TAPI version 2.0 and later.

Requirements

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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