[Mono-bugs] [Bug 74513][Nor] New - mono 1.1 will append chars <feff> before first message whenever the file is opened for append.

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Changed by gshaily@novell.com.

http://bugzilla.ximian.com/show_bug.cgi?id=74513

--- shadow/74513	2005-04-08 08:49:03.000000000 -0400
+++ shadow/74513.tmp.28917	2005-04-08 08:49:03.000000000 -0400
@@ -0,0 +1,153 @@
+Bug#: 74513
+Product: Mono: Class Libraries
+Version: 1.1
+OS: SUSE 9.1
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: CORLIB
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: gshaily@novell.com               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: mono 1.1 will append chars <feff> before first message whenever the file is opened for append. 
+
+Please fill in this template when reporting a bug, unless you know what you
+are doing.
+Description of Problem:
+When mono creates a fresh file and write into it, it does not append <feff>
+character in beginning of line but if the file is already present and it is
+appending messages into it then while opening the file it appends <feff>
+char at beginning.
+
+mono 1.1 will append chars <feff> before first message whenever the file is
+opened for append. 
+ 
+
+Steps to reproduce the problem:
+1. Compile the following code
+using System;
+using System.IO;
+
+namespace FileOpen
+{
+	/// <summary>
+	/// Summary description for Class1.
+	/// </summary>
+	class Class1
+	{
+		private FileStream log = null;
+		private StreamWriter logWriter = null;
+
+		private string fileName = "test.log";
+		/// <summary>
+		/// The main entry point for the application.
+		/// </summary>
+		[STAThread]
+		static void Main(string[] args)
+		{
+			new Class1();
+		}
+
+		Class1()
+		{
+			OpenFile();
+			Log("This is test message");
+		}
+		private void CreateFile()
+		{
+			if (File.Exists(fileName))
+				return ;
+
+			try
+			{
+				// Creation of file if it does not exist
+				FileStream fs = new FileStream(fileName, FileMode.CreateNew,
+FileAccess.Write, FileShare.ReadWrite);
+				fs.Close();
+			}
+			catch (Exception ex)
+			{
+				// Handle 2 processes having tried to create the file at the same time.
+				if (File.Exists(fileName))
+				{
+					return;
+				}
+				else
+				{
+					Console.WriteLine(": Not able to create the file: " + fileName);
+				}
+			}
+		}
+
+		// File will be opened as soon as the Simple File Appender is configured
+		private void OpenFile()
+		{
+			
+			try
+			{
+				CreateFile();
+				log = File.Open(fileName, FileMode.Append, FileAccess.Write,
+FileShare.ReadWrite);
+				logWriter = new StreamWriter(log, System.Text.Encoding.Default); 
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine( ": cannot open a file < " + fileName + ">" +
+ex.Message + ":" + ex.StackTrace);
+			}                                 
+			
+		}
+
+		// Logging the message in File
+		private void Log(String logMessage)
+		{
+			try
+			{
+				if (logWriter != null)
+				{
+					log.Seek(0, SeekOrigin.End);
+					logWriter.WriteLine(logMessage);
+					logWriter.Flush();          
+				}
+			}
+			catch (IOException ex)
+			{
+				Console.WriteLine(": Unable to write to Localfile" + ex.Message + ":" +
+ex.StackTrace);
+			}
+		}
+
+
+
+	}
+}
+
+2. Run the boave code
+3. Behaviour: When it creates a fresh file and write into it, it does not
+append <feff> character in beginning of line but if the file is already
+present and it is appending messages into it then while opening the file it
+appends <feff> char at beginning.
+
+
+Actual Results: When it creates a fresh file and write into it, it does not
+append <feff> character in beginning of line but if the file is already
+present and it is appending messages into it then while opening the file it
+appends <feff> char at beginning.
+
+
+
+Expected Results: It should not append<feff> chars whenever the file is opened
+
+
+How often does this happen? 
+
+
+Additional Information:
+I found that similar problems are faced by other developers too. There is
+an archive on internet regarding this
+http://archive.neotonic.com/archive/mono-list/messages/8843?noheader=1