Windows Driver Frameworks (WDF) is a set of libraries that you can use to write device drivers that run on the Windows operating system. WDF defines a single driver model that is supported by two frameworks: Kernel-Mode Driver Framework (KMDF) and User-Mode Driver Framework (UMDF). This topic provides answers to frequently asked questions about UMDF.
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You can build UMDF 2.1, 2.0, 1.11, and 1.9 drivers using Windows Driver Kit (WDK) 10 and Microsoft Visual Studio. For information about which versions of Windows can run drivers built using these UMDF versions, see UMDF Version History.
Yes. Even if your driver requires access to some kernel-mode resources or features, you might be able to split your driver into two parts. This approach enables you to benefit from some of the advantages of developing and running drivers in user mode.
A user-mode driver is started by the Driver Manager and runs in a driver host process. A single instance of the driver can service simultaneous requests from multiple applications. To communicate with the driver, applications issue I/O requests to the driver's device through the Win32 API. The primary entry point in a user-mode driver is the IDriverEntry interface (UMDF 1.11 and earlier) or the DriverEntry routine (starting in UMDF 2.0), rather than a main() function.
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