Source code for rtf2txt.cs

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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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namespace RobvanderWoude
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{
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	internal class Rtf2Txt
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	{
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		static string progver = "1.00";
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		static int Main( string[] args )
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		{
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			Encoding encoding = null;
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			if ( args.Length == 0 || args.Length > 2 || args.Contains( "/?" ) )

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			{
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				return ShowHelp( );
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			}
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			if ( args.Contains( "/E", StringComparer.OrdinalIgnoreCase ) )

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			{
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				return ListEncodings( );
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			}
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			string file = args[0];
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			if ( args.Length == 2 )
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			{
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				encoding = GetEncoding( args[1] );
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			}
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			if ( File.Exists( file ) && Path.GetExtension( file ).ToLower( ) == ".rtf" )

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			{
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				// Use a hidden RichTextBox to convert RTF to plain text, by Wendy Zang

				// https://social.msdn.microsoft.com/Forums/vstudio/en-US/6e56af9b-d7d3-49f3-9ec4-80edde3fe54b/reading-modifying-rtf-files?forum=csharpgeneral#a64345e9-cfcb-43be-ab18-c08fae02cb2a

				RichTextBox rtbox = new RichTextBox( );

				string rtftext = File.ReadAllText( file );

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				rtbox.Rtf = rtftext;
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				string plaintext = rtbox.Text;
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				if ( encoding == null )
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				{
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					Console.WriteLine( plaintext );
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				}
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				else
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				{
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					Encoding oldencoding = Console.OutputEncoding;

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					Console.OutputEncoding = encoding;
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					Console.WriteLine( plaintext );
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					Console.OutputEncoding = oldencoding;

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				}
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				return 0;
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			}
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			return ShowHelp( );
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		}
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		static Encoding GetEncoding( string myencoding )

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		{
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			if ( string.IsNullOrEmpty( myencoding ) )

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			{
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				return null;
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			}
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			// Get a list of available encodings
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			EncodingInfo[] encodings = Encoding.GetEncodings( );

			// Try correctly spelled encodings first

			foreach ( EncodingInfo encoding in encodings )

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			{
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				if ( encoding.Name.ToLower( ) == myencoding.ToLower( ) )

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				{
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					return Encoding.GetEncoding( encoding.CodePage );

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				}
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			}
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			// No direct match found, try again, ignoring dashes

			foreach ( EncodingInfo encoding in encodings )

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			{
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				if ( encoding.Name.Replace( "-", "" ).ToLower( ) == myencoding.Replace( "-", "" ).ToLower( ) )

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				{
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					return Encoding.GetEncoding( encoding.CodePage );

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				}
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			}
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			// Still no match, try codepages
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			foreach ( EncodingInfo encoding in encodings )

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			{
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				if ( encoding.CodePage.ToString( ) == myencoding )

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				{
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					return Encoding.GetEncoding( encoding.CodePage );

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				}
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			}
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			// Still no match, giving up
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			return null;
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		}
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		static int ListEncodings( )
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		{
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			try
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			{
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				Console.Clear( );
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			}
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			catch
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			{
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				// Console.Clear( ) throws an IO exception if the output is redirected

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			}
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			int columnwidth = 8;
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			EncodingInfo[] allencodings = Encoding.GetEncodings( );

			List<string> allencodingnames = new List<string>( );

			foreach ( EncodingInfo enc in allencodings )

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			{
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				allencodingnames.Add( enc.Name );
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			}
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			allencodingnames.Sort( );
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			foreach ( string enc in allencodingnames )

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			{
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				columnwidth = Math.Max( columnwidth, enc.Length );

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			}
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			Console.WriteLine( "{0,-" + columnwidth + "}   {1}", "Encoding", "CodePage" );

			Console.WriteLine( "{0,-" + columnwidth + "}   {1}", "========", "========" );

			foreach ( string enc in allencodingnames )

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			{
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				Console.WriteLine( "{0,-" + columnwidth + "}   {1}", enc, GetEncoding( enc ).CodePage );

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			}
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			return 0;
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		}
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		static int ShowHelp( params string[] errmsg )

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		{
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			#region Error Message
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			if ( errmsg.Length > 0 )
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			{
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				List<string> errargs = new List<string>( errmsg );

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				errargs.RemoveAt( 0 );
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				Console.Error.WriteLine( );
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				Console.ForegroundColor = ConsoleColor.Red;

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				Console.Error.Write( "ERROR:\t" );
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				Console.ForegroundColor = ConsoleColor.White;

				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );

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				Console.ResetColor( );
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			}
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			#endregion Error Message
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			#region Help Text
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```
			/*
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			Rtf2Txt.exe,  Version 1.00
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			Return the plain text content of a Rich Text Format (.RTF) file

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			Usage:    Rtf2Txt.exe   rtffile  [ encoding ]

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			or:       Rtf2Txt.exe   /E
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```

			Where:    rtffile       is the path of the file to be read (no wildcards,

			                        only .rtf extension allowed)

			          encoding      is the output encoding, e.g. UTF-8 to preserve

			                        Unicode characters, or IBM437 to convert Unicode

			                        doublequotes to ASCII

			          /E            list all available encodings

```
 
```

			Notes:    If the specified encoding does not match any available encoding

			          name, the program will try again, ignoring dashes; if that does

			          not provide a match, the program will try matching the specified

			          encoding with the available encodings' codepages.

			          Return code ("errorlevel") 1 in case of errors, 0 on success.

```
 
```

			Credits:  Use hidden RichTextBox to convert RTF to plain text by Wendy Zang

			          https://social.msdn.microsoft.com/Forums/vstudio/en-US

			          /6e56af9b-d7d3-49f3-9ec4-80edde3fe54b/reading-modifying-rtf-files

			          ?forum=csharpgeneral#a64345e9-cfcb-43be-ab18-c08fae02cb2a

```
 
```
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			Written by Rob van der Woude
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			https://www.robvanderwoude.com
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			*/
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			#endregion Help Text
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			#region Display Help Text
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Rtf2Txt.exe,  Version {0}", progver );

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			Console.Error.WriteLine( "Return the plain text content of a Rich Text Format (.RTF) file" );

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			Console.Error.WriteLine( );
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			Console.Error.Write( "Usage:    " );
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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "Rtf2Txt.exe   rtffile  [ encoding ]" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.Write( "or:       " );
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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.WriteLine( "Rtf2Txt.exe   /E" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.Write( "Where:    " );
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			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "rtffile" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( "       is the path of the file to be read" );

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			Console.Error.WriteLine( "                        (no wildcards, only .rtf extension allowed)" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          encoding" );

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			Console.ResetColor( );
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			Console.Error.Write( "      is the output encoding, e.g. " );

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "UTF-8" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( " to preserve" );

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			Console.Error.Write( "                        Unicode characters, or " );

			Console.ForegroundColor = ConsoleColor.White;

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			Console.Error.Write( "IBM437" );
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			Console.ResetColor( );
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			Console.Error.WriteLine( " to convert Unicode" );

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			Console.Error.WriteLine( "                        doublequotes to ASCII" );

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			Console.ForegroundColor = ConsoleColor.White;

			Console.Error.Write( "          /E" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( "            list all available encodings" );

```
 
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```
			Console.Error.WriteLine( );
```
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			Console.Error.WriteLine( "Notes:    If the specified encoding does not match any available encoding" );

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			Console.Error.WriteLine( "          name, the program will try again, ignoring dashes; if that does" );

```
 
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			Console.Error.WriteLine( "          not provide a match, the program will try matching the specified" );

```
 
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			Console.Error.WriteLine( "          encoding with the available encodings' codepages." );

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			Console.Error.WriteLine( "          Return code (\"errorlevel\") 1 in case of errors, 0 on success." );

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```
			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Credits:  Use hidden RichTextBox to convert RTF to plain text by Wendy Zang" );

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			Console.ForegroundColor = ConsoleColor.DarkGray;

			Console.Error.WriteLine( "          https://social.msdn.microsoft.com/Forums/vstudio/en-US" );

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			Console.Error.WriteLine( "          /6e56af9b-d7d3-49f3-9ec4-80edde3fe54b/reading-modifying-rtf-files" );

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			Console.Error.WriteLine( "          ?forum=csharpgeneral#a64345e9-cfcb-43be-ab18-c08fae02cb2a" );

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			Console.ResetColor( );
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			Console.Error.WriteLine( );
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			Console.Error.WriteLine( "Written by Rob van der Woude" );

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			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

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			#endregion Display Help Text
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```
			return 1;
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		}
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	}
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}
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```