using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using NationalInstruments.VisaNS; // Add Reference->NationalInstruments.VisaNS & NationalInstruments.common by installing NI-VISA .NET4 files from its Development Support
// Change Project Example Properties Applicaiton Target fromwork to ".Net Framework 4"

namespace Example1
{
    public partial class Form1 : Form
    {
        private MessageBasedSession mbSession;
        //Instrument VISA address
        string resourceString = "USB0::0x0699::0x0408::C011373::INSTR";

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            byte[] WFMdata = null;

            //Open connection to instrument
            mbSession = (MessageBasedSession)ResourceManager.GetLocalManager().Open(resourceString);
            init();
            WFMdata = curve();
            Plot(WFMdata);
            //Close instrument connection
            mbSession.Dispose();
        }

        private void init()
        {
            string result;
            int RecLength;
            
            mbSession.Timeout = 3000;
            mbSession.Write("*CLS");
            mbSession.Write("DATA:SOURCE CH1");
            mbSession.Write("DATa:ENCdg RPB");
            mbSession.Write("WFMOutpre:BYT_Nr 1");
            mbSession.Write("DATA:START 1");
            mbSession.Write("HEADER OFF");

            result = mbSession.Query("HORizontal:RECOrdlength?");
            RecLength = Int32.Parse(result); 
            mbSession.Write("DATA:STOP " + RecLength);
            RecLength += 25;
            mbSession.DefaultBufferSize = RecLength;
        }

        private byte[] curve()
        {
            byte[] Block = null;
            byte[] WFMdata = null;
            int i = 0;

            mbSession.SendEndEnabled = true;
            mbSession.Write("curve?");
            Block = mbSession.ReadByteArray();
            if (Block[i++] == '#')
            {
                string NZDig = ASCIIEncoding.ASCII.GetString(Block, i++, 1);
                int count = int.Parse(NZDig);

                string Dig = ASCIIEncoding.ASCII.GetString(Block, i, count);
                int record = int.Parse(Dig);

                WFMdata = new byte[record];
                i += count;
                
                MemoryStream stream = new MemoryStream(Block, i, record);
                BinaryReader reader = new BinaryReader(stream);
                for (int j = 0; j < record; j++)
                {
                    WFMdata[j] = reader.ReadByte();
                }
            }
            return WFMdata;
        }

        private void Plot(byte[] WFMdata)
        {
            try
            {
                for (int i = 0; i < WFMdata.Length; i++)
                {
                    chart1.Series["Series1"].Points.AddXY
                        (i, Convert.ToInt16(WFMdata[i]));
                }
            }
            catch
            {
            }
            chart1.Series["Series1"].ChartType =
                System.Windows.Forms.DataVisualization.Charting.SeriesChartType.FastLine;
        }
        
    }
}