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Open Usb Device

This topic describes the device-specific registry entries.

Find device information after it enumerates on Windows

View the device interface GUID, Hardware Id, and device class information about your device

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1. Find this registry key and note the DeviceInstance value:

   HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlDeviceClasses

2. Find the device instance registry key and get the device interface GUID:

   HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumUSB<hardware id><instance id>Device Parameters

3. Under the device instance key, note the device class, subclass, and protocol codes:

   HKEY_LOCAL_MACHINESYSTEMCurrentControlSetEnumUSB

Usb Video Device Driver Update

Registry settings for configuring USB driver stack behavior

The registry entries described in this topic are found under this key:

Usb Mass Storage Device Usb Device Driver

In the vvvvpppprrrrr key,

• vvvv is a 4-digit hexadecimal number that identifies the vendor
• pppp is a 4-digit hexadecimal number that identifies the product
• rrrr is a 4-digit hexadecimal number that contains the revision number of the device.

The vendor ID, product ID, and revision number values are obtained from the USB device descriptor.The following table describes the possible registry entries for the vvvvpppprrrrr key. The USB driver stack considers these entries as read-only values.

Registry entry	Description	Possible values
osvc REG_BINARY Supported on Windows XP and later versions.	Indicates whether the operating system queried the device for Microsoft-Defined USB Descriptors. If the previously-attempted OS descriptor query was successful, the value contains the vendor code from the OS string descriptor.	0x0000: The device did not provide a valid response to the Microsoft OS string descriptor request. 0x01xx: The device provided a valid response to the Microsoft OS string descriptor request, where xx is the bVendorCode contained in the response.
IgnoreHWSerNum REG_BINARY Supported on Windows Vista and later versions.	Indicates whether the USB driver stack must ignore the serial number of the device.	0x00: The setting is disabled. 0x01: Forces the USB driver stack to ignore the serial number of the device. Therefore, the device instance is tied to the port to which the device is attached.
ResetOnResume REG_BINARY Supported on Windows Vista and later versions.	Indicates whether the USB driver stack must reset the device when the port resumes from a sleep cycle.	0x0000: The setting is disabled. 0x0001: Forces the USB driver stack to reset a device on port resume.

Usb Devices USB Devices Driver

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