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

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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

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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

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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

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

Peter Sheyi 2-Sep-24 22:59pm

will this method still work in 2024? I am having similar issue. I can register a student but verifying always return this error "An error occured: Exception from HRESULT: 0xFFFFFFF8"