LINE_CLOSE (TAPI) (Compact 2013)
3/26/2014
This message is sent when the specified line device has been forcibly closed. The line device handle or any call handles for calls on the line are no longer valid once this message has been sent.
Syntax
LINE_CLOSE
dwDevice = (DWORD) hLine;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) 0;
dwParam2 = (DWORD) 0;
dwParam3 = (DWORD) 0;
Parameters
- dwDevice
Handle to the line device that was closed. This handle is no longer valid.
- dwCallbackInstance
Callback instance supplied when opening the line.
- dwParam1
Not used by this message. Value is NULL.
- dwParam2
Not used by this message. Value is NULL.
- dwParam3
Not used by this message. Value is NULL.
Return Value
None.
Remarks
The LINE_CLOSE message is only sent to any application after an open line has been forcibly closed. This can be done to prevent a single application from monopolizing a line device for too long. Whether or not the line can be reopened immediately after a forced close is device-specific.
A line device can also be forcibly closed after the user has modified the configuration of that line or its driver. If the user wants the configuration changes to be effective immediately, as opposed to after the next system restart, and the changes affect the application's current view of the device, such as a change in device capabilities, then a service provider can forcibly close the line device.
Requirements
Header |
tapi.h |