LINE_CREATE (TSPI) (Windows CE 5.0)
This message is sent to the LINEEVENT callback function when it desires to create a new device.
LINE_CREATEhtLine = (HTAPILINE) 0;htCall = (HTAPICALL) 0;dwMsg = (DWORD) LINE_CREATE;dwParam1 = (DWORD) hProvider;dwParam2 = (DWORD) lpdwDeviceId;dwParam3 = (DWORD) 0;
Parameters
- htLine
Not used. - htCall
Not used. - dwMsg
The value LINE_CREATE. - dwParam1
The service provider handle (hProvider) as received in TSPI_providerEnumDevices. - dwParam2
Contains a pointer to a device identifier, which TAPI will fill. - dwParam3
Not used.
Return Values
None.
Remarks
This message is sent to the LINEEVENT callback entry point in TAPI. The service provider receives a pointer to this callback in the TSPI_providerEnumDevices function and in each TSPI_lineOpen function; the LINE_CREATE message can be sent to the LINEEVENT callback function given to any open line or at startup.
Devices cannot be removed dynamically. If a service provider wants to remove a line from service, it can send a LINE_LINEDEVSTATE (TSPI) (LINEDEVSTATE_OUTOFSERVICE) message. It would then refuse (for example, by returning LINEERR_INVALLINESTATE) to perform any operation with the device until it returns to service or the provider is shut down and restarted (in which case the device could not be declared in TSPI_providerEnumDevices, effectively removing it from the system).
For backward compatibility, older service providers are not expected to send this message. If they do, the message is treated in the same manner as described earlier for new service providers.
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Tapi.h.
See Also
LINEEVENT | TSPI_lineOpen | TSPI_providerCreateLineDevice | TSPI_providerEnumDevices | TSPI_providerInit | TSPI_providerShutdown | LINE_LINEDEVSTATE (TSPI)
Send Feedback on this topic to the authors