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-->Windows 7 and later implement support for Biometric devices. The Windows Biometric Framework (WBF) is a generic biometric architecture in Windows 7 and later versions of Windows.
WBF includes an IOCTL-based driver interface known as the Windows Biometric Driver Interface (WBDI) as well as a Windows service called the Windows Biometric Framework API (Windows) (WBS). WBS is also referred to as the WinBio service. WBDI drivers respond to requests from the WinBio service. WBF also includes Windows log-in support.
Overview of the Biometric technology.
To develop Biometric, you need these headers: Genius driver download windows 7.
For the programming guide, see Biometric.
IOCTLs
| Title | Description |
|---|---|
| IOCTL_BIOMETRIC_CALIBRATE | The IOCTL_BIOMETRIC_CALIBRATE IOCTL directs the driver to perform any necessary steps to calibrate the device for use. |
| IOCTL_BIOMETRIC_CAPTURE_DATA | The IOCTL_BIOMETRIC_CAPTURE_DATA IOCTL directs the driver to retrieve the next scan of biometric data. This call should put the device into capture mode.Vendor-supplied WBDI drivers must support IOCTL_BIOMETRIC_CAPTURE_DATA. |
| IOCTL_BIOMETRIC_GET_ATTRIBUTES | The IOCTL_BIOMETRIC_GET_ATTRIBUTES IOCTL returns a structure that contains a set of attributes for the sensor. Vendor-supplied WBDI drivers must support this IOCTL. |
| IOCTL_BIOMETRIC_GET_INDICATOR | The IOCTL_BIOMETRIC_GET_INDICATOR IOCTL directs the driver to retrieve the status of the indicator light. This IOCTL is optional. |
| IOCTL_BIOMETRIC_GET_SENSOR_STATUS | The IOCTL_BIOMETRIC_GET_SENSOR_STATUS IOCTL tells the driver to perform any necessary steps to collect the current operating status of the device. Vendor-supplied WBDI drivers must support this IOCTL. |
| IOCTL_BIOMETRIC_GET_SUPPORTED_ALGORITHMS | The IOCTL_BIOMETRIC_GET_SUPPORTED_ALGORITHMS IOCTL retrieves a list of cryptographic hash algorithms that are supported by the device. This IOCTL is optional. |
| IOCTL_BIOMETRIC_RESET | The IOCTL_BIOMETRIC_RESET IOCTL resets the device to a known or idle state, according to the current power state. Vendor-supplied WBDI drivers must support this IOCTL. |
| IOCTL_BIOMETRIC_SET_INDICATOR | The IOCTL_BIOMETRIC_SET_INDICATOR IOCTL directs the driver to update the status of the indicator light. |
| IOCTL_BIOMETRIC_UPDATE_FIRMWARE | The IOCTL_BIOMETRIC_UPDATE_FIRMWARE IOCTL tells the driver to update the firmware for the device with the given firmware image. This IOCTL is optional. |
Structures
| Title | Description |
|---|---|
| WINBIO_BIR | The WINBIO_BIR structure is the root of the BIR (Biometric Information Record). It contains the size and offset of any other data elements in the BIR. |
| WINBIO_BIR_DATA | The WINBIO_BIR_DATA structure contains the location and size of a block in a BIR. The offset is measured from the beginning of the WINBIO_BIR structure. |
| WINBIO_BIR_HEADER | The WINBIO_BIR_HEADER structure contains the Common Biometric Exchange File Format (CBEFF) Patron Format A information that describes the rest of the BIR. |
| WINBIO_BLANK_PAYLOAD | The IOCTL_BIOMETRIC_RESET and IOCTL_BIOMETRIC_UPDATE_FIRMWARE IOCTLs return the WINBIO_BLANK_PAYLOAD structure as output. |
| WINBIO_CALIBRATION_INFO | The IOCTL_BIOMETRIC_CALIBRATE IOCTL returns the WINBIO_CALIBRATION_INFO structure as output. |
| WINBIO_CAPTURE_DATA | The IOCTL_BIOMETRIC_CAPTURE_DATA IOCTL returns the WINBIO_CAPTURE_DATA structure as output. |
| WINBIO_CAPTURE_PARAMETERS | The IOCTL_BIOMETRIC_CAPTURE_DATA IOCTL uses the WINBIO_CAPTURE_PARAMETERS structure as input. |
| WINBIO_DATA | The WINBIO_DATA structure specifies data in IOCTL payloads. |
| WINBIO_DIAGNOSTICS | The IOCTL_BIOMETRIC_GET_SENSOR_STATUS IOCTL returns the WINBIO_DIAGNOSTICS structure as output. |
| WINBIO_GET_INDICATOR | The WINBIO_GET_INDICATOR structure is the OUT payload for IOCTL_BIOMETRIC_GET_INDICATOR. |
| WINBIO_REGISTERED_FORMAT | The WINBIO_REGISTERED_FORMAT structure specifies a biometric data format. |
| WINBIO_SENSOR_ATTRIBUTES | The IOCTL_BIOMETRIC_GET_ATTRIBUTES structure returns the WINBIO_SENSOR_ATTRIBUTES structure as output. |
| WINBIO_SET_INDICATOR | The WINBIO_SET_INDICATOR structure is the IN payload for IOCTL_BIOMETRIC_SET_INDICATOR. |
| WINBIO_SUPPORTED_ALGORITHMS | The WINBIO_SUPPORTED_ALGORITHMS structure is the OUT payload for IOCTL_BIOMETRIC_GET_SUPPORTED_ALGORITHMS. |
| WINBIO_UPDATE_FIRMWARE | The WINBIO_UPDATE_FIRMWARE structure is the IN payload for IOCTL_BIOMETRIC_UPDATE_FIRMWARE. |
| WINBIO_VERSION | The WINBIO_VERSION structure describes major and minor version information for a WBDI driver. |
Vendors can provide an INF file to install a WBDI driver.
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The following is a list of guidelines for biometric device installation. The code examples in this topic are taken from the WudfBioUsbSample.inx file of the WudfBioUsbSample:
WBDI drivers should specify a class of 'Biometric.' Set ClassGuid equal to the value that corresponds to GUID_DEVCLASS_BIOMETRIC in Devguid.h:
In your .HW section, provide AddReg directives to specify three sections that contain entries to be added to the registry:
Provide the named sections referred to in the .HW section. The [Biometric_Device_AddReg] section sets values for the biometric device, including the exclusive flag and system wake/device idle. To be recognized by Windows Biometric Framework, UMDF-based WBDI drivers must set the 'Exclusive' value to 1. The first two lines of the [Biometric_Device_AddReg] section specify access control list (ACL) rights so that the device can only be opened by an administrator or the local system account. When you specify these ACL rights, third-party applications cannot open the device and capture fingerprint data when the WinBio service is not running. For example:
A WBDI driver that exposes functionality to a legacy (non-WBDI) biometric stack should set the Exclusive value to zero. If this value is set to zero, the Windows Biometric Framework does not attempt to control the device and the device is not exposed through WBF.
Vendors can have a single driver binary that can work with legacy stacks and WBF, but the two cannot operate simultaneously. WBF will only operate if the device can be opened with exclusive access.
The second named section contains registry values for the plug-in adapters. The sample uses the Microsoft-provided sensor adapter and storage adapter. This section also enables Windows log-in support by setting the SystemSensor value:
Finally, the third section sets the following registry values for the database service. The identifying GUID must be unique for each vendor database of a certain format. For instance, in this code example from the sample, change 6E9D4C5A-55B4-4c52-90B7-DDDC75CA4D50 to your own unique GUID in your INF file.
To differentiate WBDI and legacy drivers, vendors must set a Feature Score for the driver in the INX file. Feature Score is not set in the WudfBioUsbSample sample. For more information about setting a Feature Score, see Ranking a Biometric Driver on Windows Update.
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For information about INX files and how they differ from INF files, see Using INX Files to Create INF Files.
In order to replace a WBDI driver with a legacy driver, use the following procedure:
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Close all currently active WBF applications.
Uninstall the WBDI driver.
Stop the WBF service, restart it, and then stop it again.
Install the legacy driver.