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How to receive notification in cm _ register _ notification function?


Asked by Abner Escobar on Dec 10, 2021 FAQ



Upon receiving a notification, how the callback examines the notification will depend on the FilterType member of the callback routine's EventData parameter: The callback should examine EventData->u.DeviceInterface. The callback should examine EventData->u.DeviceHandle. The callback should examine EventData->u.DeviceInstance.
Moreover,
Use RegisterDeviceNotification instead of CM_Register_Notification if your code targets Windows 7 or earlier versions of Windows. Kernel mode callers should use IoRegisterPlugPlayNotification instead. The CM_Register_Notification function registers an application callback routine to be called when a PnP event of the specified type occurs.
Additionally, The operating system can send notification messages that represent the events raised by a device. The system sends those notifications either to a window or to a Windows service. And you can register to receive those notifications by calling the RegisterDeviceNotification function.
In addition,
The system sends those notifications either to a window or to a Windows service. And you can register to receive those notifications by calling the RegisterDeviceNotification function. This topic provides a code example that shows you how to register for device notifications.
Likewise,
Doing so may cause a deadlock because CM_Unregister_Notification waits for pending callbacks to finish. Instead, if you want to unregister from the notification callback, you must do so asynchronously. The following sequence shows one way to do this: