Processing I/O Requests (UMDF 1)

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.

In this section

• I/O Request Processing Operation Flow
• Sending I/O Requests to Lower Drivers
• Obtaining Parameters for I/O Requests
• Canceling I/O Requests
• Completing I/O Requests
• Accessing Data Buffers in UMDF Drivers
• Reusing Framework Request Objects
• Handling Client Impersonation in UMDF 1.x Drivers
• Preventing an Imbalance of Create and Close Notifications to a Driver