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

Demonstrate StringReader and StringWriter

<source lang="csharp"> /* 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); 
   }  
 
 }  

}

      </source>

Manipulating a string read as a line from a file

<source lang="csharp"> /* 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.

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      </source>

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

<source lang="csharp"> /* 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.

• /

      </source>

Text Reader

<source lang="csharp"> /* 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();
       }
   }
   

}

      </source>

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

Using String Reader

<source lang="csharp"> /*

* 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();
   }
 }

}

      </source>