如何在C#中序列化Digital Persona的指纹并保存到数据库

Question

我下载了供我的 digitalPersona 设备使用的注册示例代码。它已经可以注册和验证指纹，但问题是它将其指纹 .fpt 文件保存在一个文件夹中。我想把它保存在数据库中。

我无法序列化 FMD objetc 类型的指纹，

private void OnCaptured(CaptureResult captureResult)
{

    try
    {
        //check capture quality and throw an error if bad
        if (!_sender.CheckCaptureResult(captureResult)) return;

        SendMessage(Action.SendMessage, "la huella se capturo");

        DataResult<Fmd> resultConversion = FeatureExtraction.CreateFmdFromFid(captureResult.Data, Constants.Formats.Fmd.ANSI);
        if (captureResult.ResultCode != Constants.ResultCode.DP_SUCCESS)
        {
            _sender.Reset = true;
            throw new Exception(captureResult.ResultCode.ToString());
        }

        if (count == 0)
        {
            indiceDr = resultConversion.Data;
            XmlSerializer xml = new XmlSerializer(resultConversion.GetType());
            StringBuilder sb = new StringBuilder();
            StringWriter writer = new StringWriter(sb);
            xml.Serialize(writer,resultConversion);
            count += 1;
            SendMessage(Action.SendMessage, "Ahora coloca tu pulgar en el lector");
            SendMessage(Action.SendMessage, "gethashcode = "+sb.ToString());
        }
        else if (count == 1)
        {
            pulgarDr = resultConversion.Data;
            count += 1;
            SendMessage(Action.SendMessage, "Ahora coloca cualquier dedo en el lector");
        }
        else if (count == 2)
        {
            AnyFinger = resultConversion.Data;
            Fmd[] fmds = new Fmd[2];
            fmds[0] = indiceDr;
            fmds[1] = pulgarDr;

            //Verificar la documentacion del SDK
            int thresholdScore = DPFJ_PROBABILITY_ONE * 1 / 10000;

            IdentifyResult identifyResult = Comparison.Identify(AnyFinger,0,fmds, thresholdScore, 2);
            if (identifyResult.ResultCode != Constants.ResultCode.DP_SUCCESS)
            {
                _sender.Reset = true;
                throw new Exception(identifyResult.ResultCode.ToString());
            }

            SendMessage(Action.SendMessage,"Resultado de la identificación " + identifyResult.Indexes.Length.ToString());
            SendMessage(Action.SendMessage, "coloca el indice" );
            count = 0;
        }
    }
    catch (Exception ex)
    {
        SendMessage(Action.SendMessage, "Error" + ex.Message);
    }
}

Answer 1

您可以在 XML 中像这样序列化：

tempFingerPrint = Fmd.SerializeXml(resultConversion.Data);

Answer 2

好吧，我建议您以 byte[] 格式导入和导出 Fmd 数据。

Fmd > get byte[] > convert byte[] to base64

然后

base64 > decode to byte[] > then import to Fmd

我的意思是 Java 中的 C# 导出和导入。
导出 (C#)

Fmd fmd = resultConversion.Data;    
string base64Fmd = Convert.ToBase64String(fmd.Bytes)

导入（Java）

byte[] bFmd = Base64.getDecoder().decode(base64Fmd.getBytes("UTF-8"));    
Fmd fmd = UareUGlobal.GetImporter().ImportFmd(bytes1, Fmd.Format.ANSI_378_2004, Fmd.Format.ANSI_378_2004)

我使用技巧，因为我在 Java lib dpuareu.jar.
中找不到函数 SerializeXml 和 DeserializeXml 所以，这是我找到的导入和导出 Fmd 的唯一方法。
然而，

This will not limit you to use whether Java or C#, and You can combine both of them

如何在C#中序列化Digital Persona的指纹并保存到数据库

How to Serialize the fingerprint of Digital Persona in C# and saved to a database

c#

fingerprint