Accessing Device Driver Properties
In Windows Vista and later versions of Windows, the unified device property model includes device driver properties that characterize a device driver. The unified device property model uses property keys to represent these properties.
Windows Server 2003, Windows XP, and Windows 2000 also support most of these device driver properties. However, these earlier versions of Windows do not support the property keys of the unified device property model. Instead, these versions of Windows use the following mechanisms to represent and access the corresponding property information:
- Accessing Device Driver Properties That Have Corresponding Registry Entry Values
- Using SetupDiGetDriverInstallParams to Retrieve Driver Rank
To maintain compatibility with these earlier versions of Windows, Windows Vista and later versions also support these two ways to access information about a device interface. However, you should use the property keys to access these properties on Windows Vista and later versions.
For a list of the system-defined device driver properties, see Device Driver Properties. The device driver properties are listed by the property key identifiers that you use to access the properties on Windows Vista and later versions. The information that is provided with the property keys includes the names of the corresponding system-defined registry entry values that you can use to access the property on Windows Server 2003, Windows XP, and Windows 2000.
For information about how to use property keys to access device driver properties on Windows Vista and later versions, see Accessing Device Instance Properties (Windows Vista and Later).
To access device driver properties on Windows Server 2003, Windows XP, and Windows 2000, follow these steps:
Call SetupDiOpenDevRegKey to retrieve a handle to the software key for a device instance. Supply the following parameter values:
- Set DeviceInfoSet to a handle to the device information set that contains the device information element for which to retrieve the global software key.
- Set DeviceInfoData to a pointer to an SP_DEVINFO_DATA structure that represents the device information element for which to retrieve the global software key.
- Set Scope to DICS_FLAG_GLOBAL.
- Set HwProfile to zero.
- Set KeyType to DIREG_DRV, which configures SetupDiOpenDevRegKey to retrieve a handle to the software key for a device instance.
- Set samDesired to a REGSAM-typed value that specifies the access that you require for this key. For all access, set samDesired to KEY_ALL_ACCESS.
If the call to SetupDiOpenDevRegKey succeeds, SetupDiOpenDevRegKey returns a handle to the requested software key. If the function call fails, SetupDiOpenDevRegKey returns INVALID_HANDLE_VALUE. A subsequent call to GetLastError will return the most recently logged error code.
Call the RegCloseKey function to close the software registry key after access to the key is no longer required.
On Windows Server 2003, Windows XP, and Windows 2000, you can retrieve the rank of a driver that is currently installed for a device by calling SetupDiGetDriverInstallParams. SetupDiGetDriverInstallParams retrieves a pointer to an SP_DRVINSTALL_PARAMS structure for the driver in the output parameter DriverInstallParams. The Rank member of the retrieved SP_DRVINSTALL_PARAMS structure contains the driver rank.
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