Drivers Dji-innovations Port Devices

12/14/2021by admin
Drivers Dji-innovations Port Devices

Virtual COM port (VCP) drivers cause the USB device to appear as an additional COM port available to the PC. Application software can access the USB device in the This page contains the VCP drivers currently available for FTDI devices. For D2XX Direct drivers, please click here. Download the latest drivers, software, firmware, and diagnostics for your HP products from the official HP Support website.

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Each device object has a device type, which is stored in the DeviceType member of its DEVICE_OBJECT structure. The device type represents the type of underlying hardware for the driver.

Every kernel-mode driver that creates a device object must specify an appropriate device type value when calling IoCreateDevice. The IoCreateDevice routine uses the supplied device type to initialize the DeviceType member of the DEVICE_OBJECT structure.

Drivers Dji-innovations Port Devices

The system defines the following device type values, listed in alphabetical order:

These constants are defined in Ntddk.h and Wdm.h. Check these files to see whether additional device types have been defined.

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The FILE_DEVICE_DISK specification covers disk partitions and any object that appears as a disk.

Drivers Dji-innovations Port Devices Terminal

Intermediate drivers usually specify device types that represent the underlying device. For example, the system-supplied fault-tolerant disk driver, ftdisk, creates device objects of type FILE_DEVICE_DISK; it does not define new device types for the mirror sets, stripe sets, and volume sets it manages.

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FILE_DEVICE_XXX values in the range of 0 through 32767 are reserved for Microsoft. All driver writers must use these system-defined constants for devices belonging to the system-defined device types.

Drivers Dji-innovations Port Devices Replicator

If a type of hardware does not match any of the defined types, specify a value of either FILE_DEVICE_UNKNOWN, or a value within the range of 32768 through 65535.

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