Question

我正在使用ZKFingerSDK 5.3。它有一个针对c＃的演示，其中他们使用内存缓存进行测试，但是我需要将手指数据保存到数据库中并匹配手指数据以进行客户识别。请给我一个例子，如何将手指数据保存到任何数据库中（（MS SQL / MySQL / sqlite）以及如何匹配。

C＃演示项目-https://github.com/emrancu/zk4500

演示中的代码：

 MemoryStream ms = new MemoryStream();
                    BitmapFormat.GetBitmap(FPBuffer, mfpWidth, mfpHeight, ref ms);
                    Bitmap bmp = new Bitmap(ms);
                    this.picFPImg.Image = bmp;


                    String strShow = zkfp2.BlobToBase64(CapTmp, cbCapTmp);
                    textRes.AppendText("capture template data:" + strShow + "\n");

                    if (IsRegister)
                    {
                        int ret = zkfp.ZKFP_ERR_OK;
                        int fid = 0, score = 0;
                        ret = zkfp2.DBIdentify(mDBHandle, CapTmp, ref fid, ref score);

                        if (zkfp.ZKFP_ERR_OK == ret)
                        {
                            textRes.AppendText("This finger was already register by " + fid + "!\n");
                            return;
                        }

                        if (RegisterCount > 0 && zkfp2.DBMatch(mDBHandle, CapTmp, RegTmps[RegisterCount - 1]) <= 0)
                        {
                            textRes.AppendText("Please press the same finger 3 times for the enrollment.\n");
                            return;
                        }

                        Array.Copy(CapTmp, RegTmps[RegisterCount], cbCapTmp);
                        String strBase64 = zkfp2.BlobToBase64(CapTmp, cbCapTmp);
                        byte[] blob = zkfp2.Base64ToBlob(strBase64);

                        RegisterCount++;

                        if (RegisterCount >= REGISTER_FINGER_COUNT)
                        {
                            RegisterCount = 0;
                            if (zkfp.ZKFP_ERR_OK == (ret = zkfp2.DBMerge(mDBHandle, RegTmps[0], RegTmps[1], RegTmps[2], RegTmp, ref cbRegTmp)) &&
                                   zkfp.ZKFP_ERR_OK == (ret = zkfp2.DBAdd(mDBHandle, iFid, RegTmp)))
                            {
                                iFid++;
                                textRes.AppendText("enroll succ\n");
                            }
                            else
                            {
                                textRes.AppendText("enroll fail, error code=" + ret + "\n");
                            }
                            IsRegister = false;
                            return;
                        }
                        else
                        {
                            textRes.AppendText("You need to press the " + (REGISTER_FINGER_COUNT - RegisterCount) + " times fingerprint\n");
                        }
                    }

我听不懂zkfp2.DBIdentify（），zkfp2.DBAdd（），zkfp2.DBMerge（）;

public class zkfp2
{
    public zkfp2();

    public static int AcquireFingerprint(IntPtr devHandle, byte[] imgBuffer, byte[] template, ref int size);
    public static int AcquireFingerprintImage(IntPtr devHandle, byte[] imgbuf);
    public static byte[] Base64ToBlob(string base64Str);
    public static string BlobToBase64(byte[] blob, int nDataLen);
    public static bool ByteArray2Int(byte[] buf, ref int value);
    public static int CloseDevice(IntPtr devHandle);
    public static int DBAdd(IntPtr dbHandle, int fid, byte[] regTemp);
    public static int DBClear(IntPtr dbHandle);
    public static int DBCount(IntPtr dbHandle);
    public static int DBDel(IntPtr dbHandle, int fid);
    public static int DBFree(IntPtr dbHandle);
    public static int DBGetParameter(IntPtr dbHandle, int code, ref int value);
    public static int DBIdentify(IntPtr dbHandle, byte[] temp, ref int fid, ref int score);
    public static IntPtr DBInit();
    public static int DBMatch(IntPtr dbHandle, byte[] temp1, byte[] temp2);
    public static int DBMerge(IntPtr dbHandle, byte[] temp1, byte[] temp2, byte[] temp3, byte[] regTemp, ref int regTempLen);
    public static int DBSetParameter(IntPtr dbHandle, int code, int value);
    public static int ExtractFromImage(IntPtr dbHandle, string FileName, int DPI, byte[] template, ref int size);
    public static int GetDeviceCount();
    public static int GetParameters(IntPtr devHandle, int code, byte[] paramValue, ref int size);
    public static int Init();
    public static bool Int2ByteArray(int value, byte[] buf);
    public static IntPtr OpenDevice(int index);
    public static int SetParameters(IntPtr devHandle, int code, byte[] pramValue, int size);
    public static int Terminate();
}

Answer 1

一种方法是使用MemoryStream并将字节保存到数据库。您可以执行以下操作：

            MemoryStream fingerprintInfo = new MemoryStream();
            template.Serialize(fingerprintInfo);
            fingerprintInfo.Position = 0;
            BinaryReader binaryReader = new BinaryReader(fingerprintInfo);
            Byte[] byteArray = binaryReader.ReadBytes((Int32)fingerprintInfo.Length);

现在，您可以保存以下字节：

打开一个SQL连接：

SqlConnection connection = new SqlConnection("...);
SqlCommand command = new SqlCommand(...);
cmd.Parameter.Add("FingerPrint", SqlDbType.Image).Value = byteArray;

如何在ZK4500指纹扫描仪中将手指数据保存到数据库中并用c＃匹配手指？

1 个答案: