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PHONE_CLOSE
The PHONE_CLOSE message is sent when an open phone device has been forcibly
closed as part of resource reclamation. The device handle is no longer valid once
this message has been sent.
PHONE_CLOSE
hPhone = (HPHONE) hPhoneDevice;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) 0;
dwParam2 = (DWORD) 0;
dwParam3 = (DWORD) 0;
Parameters
hPhone
A handle to the open phone device that was closed. The handle is no longer
valid after this message has been sent
dwCallbackInstance
The application's callback instance provided when opening the phone device.
dwParam1
Unused.
dwParam2
Unused.
dwParam3
Unused.
Return Values
No return value.
Remarks
The PHONE_CLOSE message is only sent to an application after an open phone has
been forcibly closed. This may be done to prevent a single application from
monopolizing a phone device for too long. Whether the phone can be reopened
immediately after a forced close is device specific.
An open phone device may also be forcibly closed after the user has modified
the configuration of that phone or its driver. If the user wants the
configuration changes to be effective immediately (as opposed to after the next system
restart), and these changes affect the application's current view of the device
(such as a change in device capabilities), then a service provider may forcibly
close the phone device.
Related Links
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