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Framework Base Object

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Warning

UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2.

The archived UMDF 1 samples can be found in the Windows 11, version 22H2 - May 2022 Driver Samples Update.

For more info, see Getting Started with UMDF.

The framework base object is exposed to drivers by the IWDFObject interface. It provides basic functionality that is common across all framework object types. All framework objects are derived from this root object.

When drivers create framework base objects through a call to the IWDFDriver::CreateWdfObject method, they can initially register their IObjectCleanup interfaces so that the framework notifies the driver when the objects are about to be destroyed. Later, drivers can use the IWDFObject::AssignContext method to change how they receive notifications on the framework base object instance.