IOCTL_BIOMETRIC_GET_ATTRIBUTES IOCTL (winbio_ioctl.h)
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.
Major code
Input buffer
None.
Input buffer length
None.
Output buffer
The AssociatedIrp.SystemBuffer member points to a buffer that contains a WINBIO_SENSOR_ATTRIBUTES structure.
Output buffer length
The smallest valid output buffer size is the size of DWORD. If the driver receives a DWORD-sized output buffer, the driver should return the buffer size necessary for the requested operation.
Status block
Indicates whether the DeviceIoControl call to the driver completed and the OUT payload is valid.
The Status member is set to one of the values in the following table.
| Status value | Description |
|---|---|
| S_OK, STATUS_SUCCESS | The operation completed successfully. If the size of data returned is DWORD, the payload contains the size of the buffer necessary for the call. Otherwise, the payload contains the full output buffer. |
| E_INVALIDARG | The parameters were not specified correctly. |
| E_UNKNOWN | Any other failure that prevents the payload from being filled in. |
| E_UNEXPECTED | Any other failure that prevents the payload from being filled in. |
| E_FAIL | Any other failure that prevents the payload from being filled in. |
Remarks
If the vendor-supplied driver passes back the entire payload, it should fill in the WinBioHresult member of WINBIO_SENSOR_ATTRIBUTES with an HRESULT value indicating the status of the biometric operation.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 7 and later versions of Windows. |
| Header | winbio_ioctl.h |
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