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PHONE_REMOVE (TAPI) (Compact 2013)

  • Статья

3/26/2014

This message is sent to inform an application of the removal (deletion from the system) of a phone device. Generally, this is not used for temporary removals, but only for permanent removals in which the device would no longer be reported by the service provider if TAPI were reinitialized.

Syntax

PHONE_REMOVE
    hDevice = (DWORD) 0;
    dwCallbackInstance = (DWORD) 0;
    dwParam1 = (DWORD) hDeviceID;
    dwParam2 = (DWORD) 0;
    dwParam3 = (DWORD) 0;

Parameters

  • hDevice
    Reserved. Set to zero.
  • dwCallbackInstance
    Reserved. Set to zero.
  • dwParam1
    Identifier of the phone device that was removed.
  • dwParam2
    Reserved. Set to zero.
  • dwParam3
    Reserved. Set to zero.

Return Value

None.

Remarks and Backward Compatibility

Applications TAPI 2.0 or later are sent a PHONE_REMOVE message. This informs them that the device has been removed from the system. The PHONE_REMOVE message is preceded by a PHONE_CLOSE (TAPI) message on each phone handle, if the application had the phone open. This message is sent to all applications supporting TAPI 2.0 or later that have called the phoneInitializeEx function, including those that do not have any phone devices open at the time.

Older applications that negotiated TAPI 1.4 or earlier are sent a PHONE_STATE (TAPI) message specifying PHONESTATE_REMOVED, followed by a PHONE_CLOSE message. Unlike the PHONE_REMOVE message, however, these older applications can receive these messages only if they have the phone open when it is removed. If they do not have the phone open, their only indication that the device was removed would be receiving a PHONEERR_NODEVICE when they attempt to access the device.

After a device has been removed, any attempt to access the device by its device identifier results in a PHONEERR_NODEVICE error. After all TAPI applications have shutdown so that TAPI can restart, and when TAPI is reinitialized, the removed device no longer occupies a device identifier.

Note

It is TAPI that returns this PHONEERR_NODEVICE message after a PHONE_REMOVE message is received from a service provider; no further calls are made to that service provider using that phone device identifier.

Requirements

Header

tapi.h

See Also

Reference

TAPI Messages
phoneInitializeEx
PHONE_CLOSE (TAPI)
PHONE_STATE (TAPI)