#region 引用

using System;
using System.IO.Ports;
using System.Threading; 
using Ivi.Visa.Interop;

#endregion

namespace calibrationCmd
{
	
    public sealed class Hp34461A 
    {
        #region Fields

        private string strIPorUSB = "TCPIP0::192.168.0.101";//Example string for LAN
        //string strIPorUSB = "USB0::0x2A8D::0x1301::MY57231522"; //Example string for USB
        //string strIPorUSB = "USB0::0x2A8D::0x1401::MY57231522"; //Example string for USB
        public byte CurrentMode { get; private set; }

        #endregion

        #region Constructor

        /// <summary>初始化 <see cref="T:System.Object" /> 类的新实例。</summary>
        public Hp34461A( )  
        {
            CurrentMode = 0xff;
        }

        #endregion

        #region Methods
         
        public void SetPort(string port)
        {
            strIPorUSB = port;
        } 
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns> 
        public byte Mode()
        {
            return CurrentMode;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="mode">1: VOLT:DC， 2: CURR:DC</param>
        /// <returns></returns> 
        public bool SetMode(byte mode)
        {
            if (CurrentMode == mode)
                return true;
            CurrentMode = mode; 
            return true;
        } 
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns> 
        public void SetRemote()
        {
            Thread.Sleep(500);
        }


        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns> 
        public void SetLocal()
        {
            Thread.Sleep(500);
        }
         
        public string Call(bool ret, string format, params object[] args)
        {
			string retval = string.Empty;
			
            if (format == null)
                throw new ArgumentNullException("format");

            ResourceManager rm = new ResourceManager(); //Open up a new resource manager
            FormattedIO488 myDmm = new FormattedIO488(); //Open a new Formatted IO 488 session 
            myDmm.IO = (IMessage)rm.Open(strIPorUSB, AccessMode.NO_LOCK, 2000, ""); //Open up a handle to the DMM with a 2 second timeout
            myDmm.IO.Timeout = 3000; //You can also set your timeout by doing this command, sets to 3 seconds
            myDmm.WriteString("*CLS");
            Thread.Sleep(25);
            myDmm.WriteString(string.Format(format, args));
            Thread.Sleep(25); 
            retval = ret ? myDmm.ReadString() : string.Empty;

            myDmm.IO.Close();
			
            return retval;
        }
         
        public double Read(int delay = 500)
        {
            if (delay > 0)
                Thread.Sleep(delay);
            return double.Parse(Call(true, "Read?"));
        }

         
        public double ReadVoltage()
        {
            double fDCVResult = 0;
			
            ResourceManager rm = new ResourceManager(); //Open up a new resource manager
            FormattedIO488 myDmm = new FormattedIO488(); //Open a new Formatted IO 488 session 

            try
            {
                myDmm.IO = (IMessage)rm.Open(strIPorUSB, AccessMode.NO_LOCK, 2000, ""); //Open up a handle to the DMM with a 2 second timeout
                myDmm.IO.Timeout = 3000; //You can also set your timeout by doing this command, sets to 3 seconds

                myDmm.IO.Clear(); //Send a device clear first to stop any measurements in process
                myDmm.WriteString("*RST", true); //Reset the device
                myDmm.WriteString("*IDN?", true); //Get the IDN string   
                string IDN = myDmm.ReadString();
                Console.WriteLine(IDN); //report the DMM's identity   

                //Configure for DCV 100V range, 100uV resolution
                myDmm.WriteString("CONF:VOLT:DC 100, 0.0001", true);
                myDmm.WriteString("READ?", true);
                string DCVResult = myDmm.ReadString();
                Console.WriteLine("DCV Reading = " + DCVResult); //report the DCV reading
                CheckDMMError(myDmm); //Check if the DMM has any errors
                myDmm.IO.Close();
                double.TryParse(DCVResult, out fDCVResult);
            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message+"\n"+ ex.StackTrace); //report the DMM's identity   
            }
			
            return fDCVResult;
        }
         
        public double ReadCurrent()
        {
            double fDCIResult = 0;
			
            ResourceManager rm = new ResourceManager(); //Open up a new resource manager
            FormattedIO488 myDmm = new FormattedIO488(); //Open a new Formatted IO 488 session 
            myDmm.IO = (IMessage)rm.Open(strIPorUSB, AccessMode.NO_LOCK, 2000, ""); //Open up a handle to the DMM with a 2 second timeout
            myDmm.IO.Timeout = 3000; //You can also set your timeout by doing this command, sets to 3 seconds

            myDmm.IO.Clear(); //Send a device clear first to stop any measurements in process
            myDmm.WriteString("*RST", true); //Reset the device
            myDmm.WriteString("*IDN?", true); //Get the IDN string   
            string IDN = myDmm.ReadString();
            Console.WriteLine(IDN); //report the DMM's identity   

            //Configure for DCI 3A range, 100uA resolution
            myDmm.WriteString("CONF:CURR:DC 3, 0.0001", true);
            myDmm.WriteString("READ?", true);
            string DCIResult = myDmm.ReadString();
            Console.WriteLine("DCI Reading = " + DCIResult); //report the DCI reading
            CheckDMMError(myDmm); //Check if the DMM has any errors   

            myDmm.IO.Close();
            double.TryParse(DCIResult, out fDCIResult);
			
            return fDCIResult;
        }
         
        public void Write(string command, params object[] args)
        {
            Call(false, command, args);
        } 
        public string Error()
        { 
				string strError = string.Empty;
            
                ResourceManager rm = new ResourceManager(); //Open up a new resource manager
                FormattedIO488 myDmm = new FormattedIO488(); //Open a new Formatted IO 488 session 
                myDmm.IO = (IMessage)rm.Open(strIPorUSB, AccessMode.NO_LOCK, 2000, ""); //Open up a handle to the DMM with a 2 second timeout
                myDmm.IO.Timeout = 3000; //You can also set your timeout by doing this command, sets to 3 seconds

                myDmm.WriteString("SYST:ERR?");
				
                Thread.Sleep(25); 
                strError =  myDmm.ReadString();
				myDmm.IO.Close();
            
				return strError;
        }
        
        public void CheckDMMError(FormattedIO488 myDmm)
        {

            myDmm.WriteString("SYST:ERR?", true);
            string errStr = myDmm.ReadString();

            if (errStr.Contains("No error")) //If no error, then return
                return;
            //If there is an error, read out all of the errors and return them in an exception
            else
            {
                string errStr2 = "";
                do
                {
                    myDmm.WriteString("SYST:ERR?", true);
                    errStr2 = myDmm.ReadString();
                    if (!errStr2.Contains("No error")) errStr = errStr + "\n" + errStr2;

                } while (!errStr2.Contains("No error"));
                throw new Exception("Exception: Encountered system error(s)\n" + errStr);
            }

        }
        #endregion
    }
}