Certain framework objects expose interfaces that enable a client driver to interact with the framework.Ī UMDF-based client driver is implemented as an in-process COM server (DLL), and C++ is the preferred language for writing a client driver for a USB device. Framework objects perform complicated driver tasks and interact with Windows. The QueryInterface method enables the client driver to get interface pointers to other framework objects in the Windows Driver Frameworks (WDF) object model. The AddRef and Release methods manage the object's lifetime, so the client driver doesn't need to maintain the reference count. Every framework object must implement IUnknown and its methods, QueryInterface, AddRef, and Release, by default. UMDF (referred to as the framework in this article) is based on the component object model (COM). After building and installing the client driver, you'll view the client driver in Device Manager and view the driver output in a debugger. In this article, you'll use the USB User-Mode Driver template provided with Microsoft Visual Studio 2019 to write a user-mode driver framework (UMDF)-based client driver.
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