使用Free FingerPrint Verification SDK查找存储的指纹

Question

我一直在修改SDK提供的代码。该代码为我提供了一个选项，用于在ItemList中选择的扫描指纹进行验证，并返回计算得分的值，并说明扫描的指纹是否与所选的相同。但我想要的是读取指纹并在数据库中找到它。我使用的是U.are.U 4500指纹识别器。所以我想做的就是这个，我想要表现的是matching one-to-many

所以，这里是修改之前执行匹配的代码：

    private void btnVerify_Click(object sender, EventArgs e)
    {
        if (lbDatabase.SelectedIndex < 0)
        {
            MessageBox.Show("Please select a record from the database.");
        }
        else
        {
            try
            {
                RunWorkerCompletedEventArgs taskResult = BusyForm.RunLongTask("Waiting for fingerprint ...", new DoWorkEventHandler(doVerify),
                    false, ((CData)lbDatabase.SelectedItem).EngineUser, new EventHandler(CancelScanningHandler));
                VerificationResult verificationResult = (VerificationResult)taskResult.Result;
                if (verificationResult.engineStatus == NffvStatus.TemplateCreated)
                {
                    if (verificationResult.score > 0)
                    {
                        MessageBox.Show(string.Format("{0} verified.\r\nFingerprints match. Score: {1}", ((CData)lbDatabase.SelectedItem).Name, verificationResult.score));
                    }
                    else
                    {
                        MessageBox.Show(string.Format("{0} not verified.\r\nFingerprints do not match. Score: {1}", ((CData)lbDatabase.SelectedItem).Name, verificationResult.score));
                    }
                }
                else
                {
                    MessageBox.Show(string.Format("Verification was not finished. Reason: {0}", verificationResult.engineStatus));
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }

    private void doVerify(object sender, DoWorkEventArgs args)
    {
        VerificationResult verificationResult = new VerificationResult();

        verificationResult.score = _engine.Verify((NffvUser)args.Argument, 20000, out verificationResult.engineStatus);
        args.Result = verificationResult;
    }

以下是我在数据库中查找指纹所做的修改的代码。

     private void btnVerify_Click(object sender, EventArgs e)
    {
            try
            {

                RunWorkerCompletedEventArgs taskResult = BusyForm.RunLongTask("Waiting for finger ...", new DoWorkEventHandler(doVerify),
                    false, lbDatabase.Items.Cast<CData>().ToArray(), new EventHandler(CancelScanningHandler));
              VerificationResult verificationResult = (VerificationResult)taskResult.Result;

                if (verificationResult.engineStatus == NffvStatus.TemplateCreated)
                {
                    if (verificationResult.score > 0)
                    {
                        MessageBox.Show(string.Format("{0} verified.\r\nFingerprints match. Score: {1}", ((CData)lbDatabase.SelectedItem).Name, verificationResult.score));
                    }
                    else
                    {
                        MessageBox.Show(string.Format("{0} not verified.\r\nFingerprints do not match. Score: {1}", ((CData)lbDatabase.SelectedItem).Name, verificationResult.score));
                    }
                }
                else
                {
                    MessageBox.Show(string.Format("Verification was not finished. Reason: {0}", verificationResult.engineStatus));
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

    }

    private void doVerify(object sender, DoWorkEventArgs args)
    {
        CData[] items = (CData[])args.Argument;
        VerificationResult verificationResult = new VerificationResult();

        uint timep = 5000;
        for (int i = 0; i < items.Length; i++)
        {
            if (i != 0)
            {
                timep = 0;
            }
            verificationResult.score = _engine.Verify(items[i].EngineUser, timep, out verificationResult.engineStatus);
            if (verificationResult.score > 0) break;
        }
        args.Result = verificationResult;
    }

好吧，当我扫描人的手指并且是数据库中的第一个时，我得到了正确的结果（匹配的分数），但是当扫描的手指在另一个不是itemList中的第一个的地方时verificationResult.score始终返回-1。 我不知道这个实现是否正确我想要任何建议。