Save and extract fmd in fingerprint to database

Question

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I would like to know like how can i retrieve the FMD as based on the doumentation provided by digitalPersona, FMD will be used to save to database. Based on the code given, FMD stated successfully created but it will not be stored. In the documentation also stated that the FMD stored temporarily in memory, once exit the program it will be removed. So, i decided to use that FMD to store permanently, therefore i need to know how can i retrieve it.

C#

private void OnCaptured(CaptureResult captureResult)
        {
            try
            {
                // Check capture quality and throw an error if bad.
                if (!_sender.CheckCaptureResult(captureResult)) return;

                count++;

                DataResult<Fmd> resultConversion = FeatureExtraction.CreateFmdFromFid(captureResult.Data, Constants.Formats.Fmd.ANSI);
   
                SendMessage(Action.SendMessage, "A finger was captured.  \r\nCount:  " + (count));

                if (resultConversion.ResultCode != Constants.ResultCode.DP_SUCCESS)
                {
                    _sender.Reset = true;
                    throw new Exception(resultConversion.ResultCode.ToString());
                }

                preenrollmentFmds.Add(resultConversion.Data);

                if (count >= 4)
                {
                    DataResult<Fmd> resultEnrollment = DPUruNet.Enrollment.CreateEnrollmentFmd(Constants.Formats.Fmd.ANSI, preenrollmentFmds);

                    if (resultEnrollment.ResultCode == Constants.ResultCode.DP_SUCCESS)
                    {
                        SendMessage(Action.SendMessage, "An enrollment FMD was successfully created.");
                        SendMessage(Action.SendMessage, "Place a finger on the reader.");
                        preenrollmentFmds.Clear();
                        count = 0;
                        return;
                    }
                    else if (resultEnrollment.ResultCode == Constants.ResultCode.DP_ENROLLMENT_INVALID_SET)
                    {
                        SendMessage(Action.SendMessage, "Enrollment was unsuccessful.  Please try again.");
                        SendMessage(Action.SendMessage, "Place a finger on the reader.");
                        preenrollmentFmds.Clear();
                        count = 0;
                        return;
                    }
                }

                SendMessage(Action.SendMessage, "Now place the same finger on the reader.");
            }
            catch (Exception ex)
            {
                // Send error message, then close form
                SendMessage(Action.SendMessage, "Error:  " + ex.Message);                
            }  
        }

What I have tried:

I found the sdk provided by digital persona and read their document given to me, and i have go through it but still i have no idea.

Posted 4-Feb-16 7:24am

Nareen Nair

Updated 11-Dec-22 17:16pm

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Comments

Richard MacCutchan 5-Feb-16 4:14am

Sorry, but unless you ask a proper question it is unlikely that anyone can help you. And if you cannot understand the documentation that comes with the device then it is even less likely that we can help you.

Nareen Nair 5-Feb-16 6:37am

thanks for the reply.the problem i face is i am not sure in how to extract the FMD as in order to save to a database extraction of FMD is crucial. What this code does is only create FMD but stores is temporary. The moment i exit the program it will remove the temporary stored FMD

Richard MacCutchan 5-Feb-16 6:40am

Then you need to do something with the data before you exit your program. This is really fairly basic programming: you access some input device to read the input data, capture it in an array or object, write it to permanent storage.

Please edit your question and explain exactly what the problem is, we cannot see your screen or guess what you are doing. And while you are there please add <pre> tags around your code and remove all the pieces that are not connected with the problem.

Nareen Nair 5-Feb-16 8:44am

thanks sir, and thanks alot for replying and helping.. sir this the asjustment i made to the question. The OnCapture method above used to capture fingerpritn from the reader and convert to FMD

Richard MacCutchan 5-Feb-16 12:00pm

What exactly have you captured? Is this text, a binary arry ... ? Whatever it is you need a corresponding field in your database in order to save it.

Nareen Nair 6-Feb-16 7:47am

sir it did not state what the data type of FMD sapture... i have found and included this code Fmd.SerializeXml(resultConversion.Data); and the output produce was

<fid><bytes>Rk1SACAyMAABBAAz/v8AAAD8AUQAxQDFAQAAAFYmQMwAolxbgEEA7HFbQNoAra1ZgIgAZw1UgLYBBqlTgIMAoAlTgKYAsARSgNcAegRRQJgALG5PgKsAewVPgGUAQRFOgMEAXGJOgKQAaghOgEcBCRFOgJMAdGVNQJsA3wJNgDcAWBJMQEEAbhFKQI4BL6hKgIkBEwVKQEcAy2pIQM0A76lHgBEAthRGQEAAzQ9FgLoALwpAQB0AbxQ8QE8BCBA5QMEBKqU5QEsAhQ04gPIAsrA2AEQAim4zAAkAk2UxAPMAvKwvAPMAt60tAIgBNwgtAB0AaBctACEAWnApAO0AerMpAAA=<Format>1769473</Format><version>1.0.0

which is an XML, is it possible to have in other format such as bytes?

this i found today only

Richard MacCutchan 6-Feb-16 7:59am

The above looks like an XML encoding of some raw data. Whether you store it in this format, or in its raw form before serialisation, is your choice. The only way to understand what options are available is by reading the documentation that comes with the device and SDK. If you cannot find the information you need then you should talk to the company that makes the device.

Nareen Nair 6-Feb-16 11:11am

what options means sir? this the doumentation the provide me sir https://www.dropbox.com/s/f64byn4o75maoj8/UareUWin231_20150616.767.zip?dl=0

Richard MacCutchan 7-Feb-16 3:20am

Sorry, but I do not have the time to try and understand some device that I have never heard of. If you cannot understand the documentation then you really need to take this question to the people who make the device.

Nareen Nair 7-Feb-16 5:48am

K.. Sir... i ask them and see sir and if there is updates i inform u sir. Sir, thanks a lot for taking the effort in answering my question. I really appreciate that sir.

link111 27-Apr-18 16:18pm

here is the answer from the documentation:
Serialization The .NET API provides the ability to convert an FMD or FID into a format that can be read serially. Serialization allows you to easily transmit and store data as byte strings, streams or XML. This allows you to transmit the data or save it to standard file systems. The XML format can be used within HTML for building browser-based applications. To return the data to its original format, deserialization is also provided. Note that serialized FMDs and FIDs include the version number of the .NET wrapper was used for the serialization. If you attempt to deserialize with an older version of the wrapper, the results may not be correct. So when deserializing, the .NET wrapper will throw an SDKException if the serialization was done using a later version of the wrapper. Serialization in the .NET Wrapper occurs using the default System.Xml.Serialization.XmlSerializer. The name of the root element of the generated XML is the same as the object type. Each public member of the object is represented as an XML element. Raw byte data is encoded as a Base-64 string by XmlSerializer. Deserialization uses the same XmlSerializer. The XML that was serialized is fed into XmlSerializer where the elements with values become object members with values of the same name as the element.

Member 13290850 12-Jul-17 15:32pm

Hi Nareen , i was wondering if you have already solved your problem cause i am also having the same worries. The sdk is fixed so i don't really have an idea so please kindly help me.

link111 27-Apr-18 16:21pm

this is what works:
Fmd obj;
byte[] bytes;
IFormatter formatter = new BinaryFormatter();
using (MemoryStream stream = new MemoryStream())
{
formatter.Serialize(stream, obj);
bytes = stream.ToArray();
}

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

Member 14599241 · Answer 1 · 2022-12-11T17:16:00

Solution 2

What you need is to xmlserialized the result enrollment fmd and store it in db which will be deserialized when you retrieved it but consider security issue hash the data or even add with salting

Fmd.serializedXml(fmd);
During retrieval
Fmd.DeserializedXml(fmd);

Posted 11-Dec-22 17:16pm

Member 14599241

Comments

Dave Kreskowiak 12-Dec-22 0:16am

I seriously doubt the OP is still working on the problem six years later.

Save and extract fmd in fingerprint to database

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