phoneSetHookSwitch

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

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.

Syntax

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 Value

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.

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.

Requirements