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LINE_CLOSE
The LINE_CLOSE 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no longer valid once this message has been sent.
LINE_CLOSE
dwDevice = (DWORD) hLine;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) 0;
dwParam2 = (DWORD) 0;
dwParam3 = (DWORD) 0;
Parameters
dwDevice
A handle to the line device that was closed. This handle is no longer valid.
dwCallbackInstance
The callback instance supplied when opening the line.
dwParam1
Unused.
dwParam2
Unused.
dwParam3
Unused.
Return Values
No return value.
Remarks
The LINE_CLOSE message is only sent to any application after an open line has
been forcibly closed. This may 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 may 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 they affect the application's current view of the device (such as a change
in device capabilities), then a service provider may forcibly close the line
device.
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