Save text file in fez spider using micro sd module

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1

how to save text file in fez spider using micro sd module ? please send me source code
when i am using persistant storage this error shown .
An unhandled exception of type ‘System.InvalidOperationException’ occurred in GHIElectronics.NETMF.IO.dll. this error shown how to solve.

2

Biren, you are asking the same question many times. Have you stepped through the guides in the NetMF and Gadgeteer sections of Support – GHI Electronics ? There is a lot of known working code in all those examples, and you will learn a lot by reading them.

3

Does this help as its part of some code I was going to codeshare as part of Grove Expansion Module. It creates a file ‘AirQuality.txt’ on the MicroSD Card (yes I’m using a MicroSD Module in this project), which contains lines of data separated by a ‘;’ which makes it easy to import into Excel for analysis.



using System;
using System.IO;
using Gadgeteer;
using Gadgeteer.Interfaces;
using Gadgeteer.Modules.GHIElectronics;
using Microsoft.SPOT;
using Gadgeteer.Modules.Seeed;


namespace HydraGrove
{
    public partial class Program
    {
        private static string _dataFilePath = @ "\SD\AirQuality.TXT";
        private StorageDevice _storage;

        private AnalogInput _aq;
        private AnalogInput _mq2;
        private AnalogInput _mq5;

        // This method is run when the mainboard is powered up or reset.   
        private void ProgramStarted()
        {

            Debug.Print("Program Started");

            _mq2 = groveExpansion.SetupAnlogInput(Socket.Pin.Three);

            _aq = groveExpansion.SetupAnlogInput(Socket.Pin.Four);

            _mq5 = groveExpansion.SetupAnlogInput(Socket.Pin.Five);

            sdCard.SDCardMounted += sdCard_SDCardMounted;
            sdCard.SDCardUnmounted += sdCard_SDCardUnmounted;

            if (sdCard.IsCardMounted)
            {
                _storage = sdCard.GetStorageDevice();
            }

            var _timer = new Timer(5000);

            _timer.Tick += _timer_Tick;

            _timer.Start();
        }

        private void sdCard_SDCardUnmounted(SDCard sender)
        {
            _storage = null;
        }

        private void sdCard_SDCardMounted(SDCard sender, StorageDevice SDCard)
        {
            if (sdCard.IsCardMounted)
            {
                _storage = sdCard.GetStorageDevice();
            }
        }

        private void _timer_Tick(Timer timer)
        {
            oledDisplay.SimpleGraphics.Clear();

            double mq2v = _mq2.ReadVoltage();
            double mq2p = _mq2.ReadProportion();

            double mq5v = _mq5.ReadVoltage();
            double mq5p = _mq5.ReadProportion();

            double aqv = _aq.ReadVoltage();
            double aqp = _aq.ReadProportion();

            oledDisplay.SimpleGraphics.DisplayText("MQ2 volts: " + mq2v.ToString(),
                                                   Resources.GetFont(Resources.FontResources.small), Color.Blue, 0, 0);
            oledDisplay.SimpleGraphics.DisplayText("MQ2 pro: " + mq2p.ToString(),
                                                   Resources.GetFont(Resources.FontResources.small), Color.Blue, 0, 14);

            oledDisplay.SimpleGraphics.DisplayText("AQ volts: " + aqv.ToString(),
                                                   Resources.GetFont(Resources.FontResources.small), Color.Red, 0, 31);
            oledDisplay.SimpleGraphics.DisplayText("AQ pro: " + aqp.ToString(),
                                                   Resources.GetFont(Resources.FontResources.small), Color.Red, 0, 45);

            oledDisplay.SimpleGraphics.DisplayText("MQ5 volts: " + mq5v.ToString(),
                                                   Resources.GetFont(Resources.FontResources.small), Color.Yellow, 0, 62);
            oledDisplay.SimpleGraphics.DisplayText("MQ5 pro: " + mq5p.ToString(),
                                                   Resources.GetFont(Resources.FontResources.small), Color.Yellow, 0, 76);

            if (_storage != null)
            {
                try
                {
                    var sw = new StreamWriter(File.Open(_dataFilePath, FileMode.Append, FileAccess.Write));
                    sw.WriteLine(mq2v.ToString() + ";" + mq2p.ToString() + ";" +
                                 aqv.ToString() + ";" + aqp.ToString() + ";" +
                                 mq5v.ToString() + ";" + mq5p.ToString());
                    sw.Flush();
                    sw.Close();
                }
                catch (Exception ex)
                {
                    Debug.Print(ex.Message);
                }
            }
        }
    }
}