नोट
इस पेज तक पहुँच के लिए प्रमाणन की आवश्यकता होती है. आप साइन इन करने या निर्देशिकाओं को बदलने का प्रयास कर सकते हैं.
इस पेज तक पहुँच के लिए प्रमाणन की आवश्यकता होती है. आप निर्देशिकाओं को बदलने का प्रयास कर सकते हैं.
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 adds a device object for each device loaded in the driver host process. To add the device, the framework calls the driver's IDriverEntry::OnDeviceAdd method and passes the IWDFDriver and IWDFDeviceInitialize interfaces in the call. The supplied IWDFDeviceInitialize interface is only valid before the driver calls IWDFDriver::CreateDevice. The driver can call the following methods of IWDFDeviceInitialize to perform the following operations:
The driver calls the IWDFDeviceInitialize::RetrieveDevicePropertyStore method to retrieve the IWDFNamedPropertyStore interface for the device property store. The driver can use IWDFNamedPropertyStore to retrieve and set properties for the device.
The driver calls the IWDFDeviceInitialize::SetLockingConstraint method to specify how its callback functions are called by the framework.
The driver calls the IWDFDeviceInitialize::SetFilter method to enable the device as a filter device.
After the driver uses IWDFDeviceInitialize to initialize the device, the driver passes a pointer to IWDFDeviceInitialize in a call to the IWDFDriver::CreateDevice method to create a UMDF device object for the device. After the framework device object is created, the driver makes calls to the IWDFDevice::CreateIoQueue method to create read and write I/O queues. In these IWDFDevice::CreateIoQueue calls, the driver must identify how it receives requests from the I/O queue. For more information, see Configuring Dispatch Mode for an I/O Queue.