how to verify DPFP finger print from MS SQL in C#

Question

0.00/5 (No votes)

See more:

SQL-Server-2008R2

i have saved the digital persona dpfp template in varbinary(max), now i am retireivng it from database , converting in byte[] then deserilizing it, and then putting in the verify() method, but error occcruing
Exception from HRESULT: 0xFFFFFFF8

how i am getting data is given below

SqlConnection cn = new SqlConnection(@"Data Source=Windows\me;Initial Catalog=Enroll;Persist Security Info=True;User ID=sa ; Password=sa123");

cn.Open();
SqlDataAdapter adp = new SqlDataAdapter("Select varb from employee where employeeid='127'", cn);
DataTable dt = new DataTable();
adp.Fill(dt);
bytes= ConvertDataSetToByteArray(dt);

Template = new DPFP.Template();
Template.DeSerialize(bytes);

Verificator.Verify(features, Template, ref result);
UpdateStatus(result.FARAchieved);
if (result.Verified)
MakeReport("The fingerprint was VERIFIED.");
else
MakeReport("The fingerprint was NOT VERIFIED.");
}

this Verify() is not verifying the data coming from DB>

where i am doing mistake? in conversion? or in not getting data properly?

Posted 1-Jul-15 5:31am

Karachi Coder

Updated 29-Mar-19 4:15am

Add a Solution

Comments

Member 12862705 23-Jan-17 10:12am

hey man how to verify all fingerprint template from database ? this code is from one touch sdk enrollment sample right?

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Duncan Edwards Jones · Accepted Answer · 2015-07-01T05:51:00

Solution 1

ConvertDataSetToByteArray does not do what you think it does.

You need to get the data table value for the field "varb" as a byte array ( see Field<t>()[^] )

Posted 1-Jul-15 5:51am

Duncan Edwards Jones

Comments

Karachi Coder 1-Jul-15 12:24pm

this method contains

private byte[] ConvertDataSetToByteArray(DataTable dataTable)
{
byte[] binaryDataResult = null;
using (MemoryStream memStream = new MemoryStream())
{
BinaryFormatter brFormatter = new BinaryFormatter();
dataTable.RemotingFormat = SerializationFormat.Binary;
brFormatter.Serialize(memStream, dataTable);
binaryDataResult = memStream.ToArray();
}
return binaryDataResult;
}

what to do now

Karachi Coder · Accepted Answer · 2015-07-01T07:04:00

Solution 2

ConvertDataSetToByteArray() mehthod should be excluded

System.Byte in datable will be convert in to byte[] by:

C#

foreach (DataRow row in dt.Rows)
                   {
                        bytes = (byte[])row["varb"];
                   }

Posted 1-Jul-15 7:04am

Karachi Coder