FEZ Opening and Reading a File from an SD Card Example

This code example demonstrates opening and reading from a file found on an SD card connected to a GHI Electronics FEZ board. Just like other storage based operations on a FEZ board – this example contains code that is similar to code that may be used on a PC when accessing a local file system.

This code is written in C# and assumes the development workstation has all required software installed.

using System.IO;
using System.Text;
using System.Threading;

using Microsoft.SPOT;
using Microsoft.SPOT.IO;

using GHIElectronics.NETMF.IO;
 
namespace MFConsoleApplication1
{
    public class Program
    {
        static void Main()
        {
            PersistentStorage sdPS = new PersistentStorage("SD");
 
            sdPS.MountFileSystem();
 
            string rootDirectory = VolumeInfo.GetVolumes()[0].RootDirectory;
            FileStream FileHandle = new FileStream(rootDirectory + @"hello.txt", FileMode.Open, FileAccess.Read);
            byte[] data = new byte[100];

            int read_count = FileHandle.Read(data, 0, data.Length);
            FileHandle.Close();
            Debug.Print("The size of data we read is: " +  read_count.ToString());
            Debug.Print("Data from file:");
            Debug.Print(new string(Encoding.UTF8.GetChars(data), 0, read_count));
 
            sdPS.UnmountFileSystem();
 
            Thread.Sleep(Timeout.Infinite);
        }
    }
}

For more information on specific namespaces please refer to the following resources:

• System Namespace
• System.IO Namespace
• System.Threading Namespace
• Microsoft.SPOT Namespace
• Microsoft.SPOT.IO Namespace

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