The first missing feature was printing the completion status of the requests. As you implement and organize your functions, you might decide to add additional. The only piece left is the creation of a control device object and interfacing to a user mode application. This was easily the most frustrating part of writing the filter because it took quite a bit of time to get right hence the subtitle to this article. At this point, you have a driver project that implements the general code required by most UMDF drivers.

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For some technologies, there might not be any recommendation for a filter driver model. Installing a floppy filter?

NDIS template under Networking. ECHO Demonstrates how to use the framework’s queue and request objects and automatic synchronization.

But, I’m getting a bit ahead of myself Feedback We’d love to hear your thoughts. This indicates to the framework that your device is indeed a filter and results in all sorts of great things being done for you.

Creating a New Filter Driver

For information on building the samples, see Building a Driver. The rest of the callbacks can be found in their entirety in the source code supplied with this article kmdc of page. At this point, you have a driver project that implements the filtter code required by most KMDF drivers.


WmiSamp Demonstrates how to register WMI providers and create provider instances for framework device objects and how to handle WMI queries that applications send to the device.

Sample KMDF Drivers – Windows drivers | Microsoft Docs

Make sure that the service start type used when calling CreateService absolutely matches what you need. The problem is that the coinstaller installs the KMDF library driver to match your driver.

For other technologies, the documentation gives explicit details on how to write a filter driver. Click Here to Download: Read about this change in our blog post. This means that instead of wasting your time writing code to deal flter requests that fiilter have no interest in, you can get right to the things that are important to you. Sign up using Facebook. Instead of going into a long diatribe about how to put all of this sauce together, I’ll refer you to the “nonpnp” sample in the WDF distribution or the “wdffltrinstall” application provided with the source for the filter described in this article is supplied top of page.

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Sample KMDF Drivers

Some technologies have mini filter models. Again, all associated code can be downloaded from the link at the top of this page. Setting Up a Completion Routine. Make sure you’re set to boot start. A few hundred lines later, all that was left to do was filger this chicken and see if it would fly.


As you implement and organize your functions, you might decide to add additional. In this topic we explain how to use Visual Studio to start writing a new filter driver.

Creating a New Filter Driver – Windows drivers | Microsoft Docs

For many, but not all, of the various callbacks that you register for, the framework makes you responsible for either completing the request kmdt your filter or passing the request to the next device. This requires a few extra steps than the code included above, but nothing that should be too shocking for those already familiar with the framework. By the time I had the basic code in place that spit requests out in the debugger, I felt like I had barely done anything. If your device technology has a specific filter or minifilter model, check to see if Visual Studio has a template for the model.

The rest of the callbacks listed above require no special processing.