Both devices and device interfaces support storing state via the PnP property model. The property model allows for structured property data to be stored against a device or device interface.
This is meant for smaller data that reasonably fits into the property types supported by the property model. If a driver wants to allow other components to read or modify the driver's internal state, the driver should expose an interface that another component can call into that tells the driver what settings to return or how to modify particular settings. Typically, the driver that owns the state exposes a device interface in a custom device interface class. When the driver is ready for other components to have access to the state, it enables the interface.
To get notified when a device interface is enabled, user mode components can register for device interface arrival notifications and kernel mode components can use IoRegisterPlugPlayNotification. For these components to access the state, the driver enabling the interface must define a contract for its custom device interface class. This contract typically is one of two kinds:. Alternatively, if the driver that owns the state allows direct access to the state, other drivers could access state by using system-supplied functions for programmatic access to device interface state.
See Device Interface Registry State for more information. These interfaces or state depending on sharing method used need to be properly versioned so the driver owning the state can be serviced independently of other components that access that state.
Driver vendors cannot rely on other components being serviced at the same time as the driver and staying at the same version. Because devices and drivers controlling interfaces come and go, drivers and applications should avoid calling IoGetDeviceInterfaces at component start-up to get a list of enabled interfaces.
Instead, the best practice is to register for notifications of device interface arrival or removal and then call the appropriate function to get the list of existing enabled interfaces on the machine. Skip to main content. This browser is no longer supported.
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Any ideas? Edited Nov 16, at UTC. Best Answer. An update to this; we managed to resolve the issue through Citrix support. The solution was as simple as upgrading the VDA servers to the newest version 7 There is also discussion on the Citrix forum about the case.
View this "Best Answer" in the replies below ». Thai Pepper. John This person is a verified professional. Right-Click with the mouse on eltcpacket and select Delete Key. The packet driver will be removed from your Windows system. This is not required for correct operation of the EnterpriseLink Cluster Server. Site Search User. Top Contributors.
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