Obtaining attendance logs from ZKTEco device using their SDK with C#

I'm attempting to integrate a ZKTEco U650-C with my company's systems to automatically fetch attendance logs but I'm having trouble connecting to the device using C#.

I managed to download the SDK from their website which includes the ZKHID, ZKCamera DLL files, and the SDK wrapper so I could import and use the functions from them.

In Visual Studio, I couldn't reference the ZKHID and ZKCamera DLL files because they are unmanaged. Although, I was able to reference the ZKBioModuleSDKWrapper because it uses PInvoke.

Some operations such as connecting to the device using the TcpClient class, initializing, and terminating the device were successful. However, using other operations such as opening the device and getting the device configuration couldn't be made because I don't know how to get the device handle.

Am I using the wrong set of SDK or is it something else? Any help would be appreciated.

It turns out I was using the wrong set of SDK. ZKTEco took down the SDK download link from their official website so I had to downloaded the correct SDK from a private server.

I added the zkemkeeper.dll reference as normal in Visual Studio, made some changes to the code, and I managed to receive the attendance logs.

using zkemkeeper;

namespace ZKTEco_Biometric_Device_Integration
{
    internal class Program
    {
        public Program()
        {
        }

        public enum CONSTANTS
        {
            PORT = 4370,
        }
        static void Main(string[] args)
        {
            Console.WriteLine("Connecting...");
            CZKEM objCZKEM = new CZKEM();
            if (objCZKEM.Connect_Net("192.168.1.11", (int)CONSTANTS.PORT))
            {
                objCZKEM.SetDeviceTime2(objCZKEM.MachineNumber, DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute, DateTime.Now.Second);
                Console.WriteLine("Connection Successful!");
                Console.WriteLine("Obtaining attendance data...");
            }
            else
            {
                Console.WriteLine("Connection Failed!");
            }
            if (objCZKEM.ReadGeneralLogData(objCZKEM.MachineNumber))
            {
                //ArrayList logs = new ArrayList();
                string log;
                string dwEnrollNumber;
                int dwVerifyMode;
                int dwInOutMode;
                int dwYear;
                int dwMonth;
                int dwDay;
                int dwHour;
                int dwMinute;
                int dwSecond;
                int dwWorkCode = 1;
                int AWorkCode;
                objCZKEM.GetWorkCode(dwWorkCode, out AWorkCode);
                //objCZKEM.SaveTheDataToFile(objCZKEM.MachineNumber, "attendance.txt", 1);
                while (true)
                {
                    if (!objCZKEM.SSR_GetGeneralLogData(
                    objCZKEM.MachineNumber,
                    out dwEnrollNumber,
                    out dwVerifyMode,
                    out dwInOutMode,
                    out dwYear,
                    out dwMonth,
                    out dwDay,
                    out dwHour,
                    out dwMinute,
                    out dwSecond,
                    ref AWorkCode
                    ))
                    {
                        break;
                    }
                    log = "User ID:" + dwEnrollNumber + " " + verificationMode(dwVerifyMode) + " " + InorOut(dwInOutMode) + " " + dwDay + "/" + dwMonth + "/" + dwYear + " " + time(dwHour) + ":" + time(dwMinute) + ":" + time(dwSecond);
                    Console.WriteLine(log);
                    //logs.Add(log);
                }
            }
            //Console.ReadLine();
        }

        static void getAttendanceLogs(CZKEM objCZKEM)
        {
            string log;
            string dwEnrollNumber;
            int dwVerifyMode;
            int dwInOutMode;
            int dwYear;
            int dwMonth;
            int dwDay;
            int dwHour;
            int dwMinute;
            int dwSecond;
            int dwWorkCode = 1;
            int AWorkCode;
            objCZKEM.GetWorkCode(dwWorkCode, out AWorkCode);
            //objCZKEM.SaveTheDataToFile(objCZKEM.MachineNumber, "attendance.txt", 1);
            while (true)
            {
                if (!objCZKEM.SSR_GetGeneralLogData(
                objCZKEM.MachineNumber,
                out dwEnrollNumber,
                out dwVerifyMode,
                out dwInOutMode,
                out dwYear,
                out dwMonth,
                out dwDay,
                out dwHour,
                out dwMinute,
                out dwSecond,
                ref AWorkCode
                ))
                {
                    break;
                }
                log = "User ID:" + dwEnrollNumber + " " + verificationMode(dwVerifyMode) + " " + InorOut(dwInOutMode) + " " + dwDay + "/" + dwMonth + "/" + dwYear + " " + time(dwHour) + ":" + time(dwMinute) + ":" + time(dwSecond);
                Console.WriteLine(log);
            }
        }

        static string time(int Time)
        {
            string stringTime = "";
            if (Time < 10)
            {
                stringTime = "0" + Time.ToString();
            }
            else
            {
                stringTime = Time.ToString();
            }
            return stringTime;
        }

        static string verificationMode(int verifyMode)
        {
            String mode = "";
            switch (verifyMode)
            {
                case 0:
                    mode = "Password";
                    break;
                case 1:
                    mode = "Fingerprint";
                    break;
                case 2:
                    mode = "Card";
                    break;
            }
            return mode;
        }

        static string InorOut(int InOut)
        {
            string InOrOut = "";
            switch (InOut)
            {
                case 0:
                    InOrOut = "IN";
                    break;
                case 1:
                    InOrOut = "OUT";
                    break;
                case 2:
                    InOrOut = "BREAK-OUT";
                    break;
                case 3:
                    InOrOut = "BREAK-IN";
                    break;
                case 4:
                    InOrOut = "OVERTIME-IN";
                    break;
                case 5:
                    InOrOut = "OVERTIME-OUT";
                    break;

            }
            return InOrOut;
        }
    }
}