Csharp/C Sharp/File Stream/Ascii String Read Write

Demonstrate StringReader and StringWriter

/*
C#: The Complete Reference 
by Herbert Schildt 
Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Demonstrate StringReader and StringWriter 
 
using System; 
using System.IO; 
   
public class StrRdrDemo {   
  public static void Main() {   
    // Create a StringWriter 
    StringWriter strwtr = new StringWriter(); 
 
    // Write to StringWriter. 
    for(int i=0; i < 10; i++) 
       strwtr.WriteLine("This is i: " + i); 
 
    // Create a StringReader 
 
    StringReader strrdr = new StringReader(strwtr.ToString()); 
 
    // Now, read from StringReader. 
    string str = strrdr.ReadLine(); 
    while(str != null) { 
      str = strrdr.ReadLine(); 
      Console.WriteLine(str); 
    }  
  
  }  
}

Manipulating a string read as a line from a file

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
//
//  Builder.cs -- Demonstrates manipulating a string read as a line from a file
//                Compile this program with the following command line:
//                    C:>csc Builder.cs
//
namespace nsBuilder
{
    using System;
    using System.Text;
    using System.IO;
    public class Builder
    {
        static public int Main ()
        {
// Create a stream object and open the input file
            FileStream istream;
            try
            {
                istream = new FileStream ("sample.txt", FileMode.Open, FileAccess.Read);
            }
            catch (Exception)
            {
                Console.WriteLine ("Could not open sample.txt for reading");
                return (-1);
            }
// Associate a reader with the stream
            StreamReader reader = new StreamReader (istream);
// Declare a new StringBuilder
            StringBuilder strb = new StringBuilder ();
// Counter for the lines
            int Lines = 0;
            while (reader.Peek() > 0)
            {
                ++Lines;
// Clear out the string builder
                strb.Length = 0;
// Read a line from the file
                string str = reader.ReadLine();
// Split the line into words
                string [] Data = str.Split (new char [] {" "});
// Build the output line to show line, word and character count
                strb.AppendFormat ("Line {0} contains {1} words and {2} characters:\r\n{3}", Lines, Data.Length, str.Length, str);
// Write the string to the console
                Console.WriteLine (strb.ToString ());
            }
            istream.Close ();
            return (0);
        }
    }
}
//File: sample.txt
/*
The quick red fox jumps over the lazy brown dog.
Now is the time for all good men to come to the aid of their Teletype.
Peter Piper picked a peck of peppered pickles.

*/

Reads an ASCII encoded file and writes the text to another file in wide character format

/*
C# Programming Tips & Techniques
by Charles Wright, Kris Jamsa
Publisher: Osborne/McGraw-Hill (December 28, 2001)
ISBN: 0072193794
*/
//  Convert.cs -- Reads an ASCII encoded file and writes the text to another file
//                in wide character format.
//                Compile this program with the following command line:
//                    C:>csc Convert.cs
//
namespace nsConvert
{
    using System;
    using System.Text;
    using System.IO;
    public class Convert
    {
        static public int Main ()
        {
// First, make sure both the input and output files can be opened
            FileStream ostream;
            FileStream istream;
            try
            {
                istream = new FileStream ("Sample.asc", FileMode.Open, FileAccess.Read);
            }
            catch (Exception)
            {
                Console.WriteLine ("Cannot open Sample.asc for reading");
                return (-1);
            }
            try
            {
                ostream = new FileStream ("Sample.wcs", FileMode.Create, FileAccess.ReadWrite);
            }
            catch (Exception)
            {
                Console.WriteLine ("Cannot open Sample.wcs for writing");
                istream.Close ();
                return (-1);
            }
// Create a stream reader and attach the input stream with ASCII encoding
            StreamReader reader = new StreamReader (istream, new ASCIIEncoding());
            string str = reader.ReadToEnd ();
// Create a stream writer and attach the output stream using Unicode encoding
            StreamWriter writer = new StreamWriter (ostream, new UnicodeEncoding());
// Write the text to the file.
            writer.Write (str);
// Flush the output stream
            writer.Flush ();
// Close the streams
            ostream.Close ();
            istream.Close ();
            return (0);
        }
    }
}
//File: Sample.asc
/*
The quick red fox jumps over the lazy brown dog.
Now is the time for all good men to come to the aid of their Teletype.
Peter Piper picked a peck of peppered pickles.
*/

Text Reader

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;

using System.IO;
using System.Text;

namespace Wrox.WindowsGUIProgramming.Chapter10
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class TextReader : System.Windows.Forms.Form
    {
        private System.Windows.Forms.RichTextBox rtbText;
        private System.Windows.Forms.Button butSomeText;
        private System.Windows.Forms.Button butSomeMoreText;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        public TextReader()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.rtbText = new System.Windows.Forms.RichTextBox();
            this.butSomeText = new System.Windows.Forms.Button();
            this.butSomeMoreText = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // rtbText
            // 
            this.rtbText.Name = "rtbText";
            this.rtbText.Size = new System.Drawing.Size(296, 232);
            this.rtbText.TabIndex = 0;
            this.rtbText.Text = "";
            // 
            // butSomeText
            // 
            this.butSomeText.Location = new System.Drawing.Point(16, 240);
            this.butSomeText.Name = "butSomeText";
            this.butSomeText.Size = new System.Drawing.Size(88, 23);
            this.butSomeText.TabIndex = 1;
            this.butSomeText.Text = "Some Text";
            this.butSomeText.Click += new System.EventHandler(this.butSomeText_Click);
            // 
            // butSomeMoreText
            // 
            this.butSomeMoreText.Location = new System.Drawing.Point(168, 240);
            this.butSomeMoreText.Name = "butSomeMoreText";
            this.butSomeMoreText.Size = new System.Drawing.Size(104, 23);
            this.butSomeMoreText.TabIndex = 2;
            this.butSomeMoreText.Text = "Some More Text";
            this.butSomeMoreText.Click += new System.EventHandler(this.butSomeMoreText_Click);
            // 
            // TextReader
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.butSomeMoreText,
                                                                          this.butSomeText,
                                                                          this.rtbText});
            this.Name = "TextReader";
            this.Text = "TextReader";
            this.ResumeLayout(false);
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new TextReader());
        }
        private void butSomeText_Click(object sender, System.EventArgs e)
        {
            Class1 c = new Class1();
            rtbText.Text = c.ReadText();
        }
        private void butSomeMoreText_Click(object sender, System.EventArgs e)
        {
            Class1 c = new Class1();
            rtbText.Text = c.ReadMoreText();
        }

    }
    
    /// <summary>
    /// Summary description for Class1.
    /// </summary>
    public class Class1
    {
        public Class1()
        {
            //
            // TODO: Add constructor logic here
            //
        }
        public string ReadText()
        {
            //FileStream fs = File.OpenRead("C:\Documents and Settings\richard.conway\My Documents\Visual Studio Projects\TextReader\bin\Debug\readtext.rtf")
            FileStream f = File.OpenRead(System.Environment.CurrentDirectory+"\\readtext.rtf");
            StreamReader s = new StreamReader(f);
            return s.ReadToEnd();
        }
        public string ReadMoreText()
        {
            FileStream f = File.OpenRead(System.Environment.CurrentDirectory+"\\readmoretext.rtf");
            StreamReader s = new StreamReader(f);
            return s.ReadToEnd();
        }
    }
    
}

<A href="http://www.nfex.ru/Code/CSharpDownload/TextReader.zip">TextReader.zip( 2 k)</a>

Using String Reader

/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 * Version: 1
 */
using System;
using System.IO;
namespace Client.Chapter_10___Interop_Services
{
  public class UsingStringReader {
    static void Main(string[] args)
    {
      // Create a string to read characters from.
      String MyString = "Hello World";
      // Size the array to hold all the characters of the string,
      // so that they are all accessible.
      char[] MyChar = new char[12];
      // Create a StringReader and attach it to the string.
      StringReader MyStringReader = new StringReader(MyString);
      // Read 5 characters from the array that holds the string, starting
      // from the first array member.
      MyStringReader.Read(MyChar, 0, 5);
      // Display the output.
      Console.WriteLine(MyChar);
      // Close the StringReader.
      MyStringReader.Close();
    }
  }
}