LINE_CREATE

This message is sent to inform the application of the creation of a new line device.

At a Glance

Syntax

LINE_CREATE dwDevice = (DWORD) 0;
dwCallbackInstance = (DWORD) 0; dwParam1 = (DWORD) idDevice;
dwParam2 = (DWORD *) 0; dwParam3 = (DWORD) 0;

Parameters

dwDevice

Unused.

dwCallbackInstance

Unused.

dwParam1

Specifies the hDeviceID of the newly created device.

dwParam2

Unused.

dwParam3

Unused.

Return Values

None.

Remarks

Older applications (that negotiated TAPI version 1.3) are sent a LINE_LINEDEVSTATE message specifying LINEDEVSTATE_REINIT, which requires them to shut down their use of the API and call lineInitialize again to obtain the new number of devices. Unlike previous versions of TAPI, however, this version does not require all applications to shut down before allowing applications to reinitialize; reinitialization can take place immediately when a new device is created (complete shutdown is still required when a service provider is removed from the system).

Applications supporting TAPI version 1.4 or later are sent a LINE_CREATE message. This informs them of the existence of the new device and its new device identifier. The application can then choose whether or not to attempt working with the new device at its leisure. This message is sent to all applications supporting this or subsequent versions of the API that have called lineInitialize, including those that do not have any line devices open at the time.