By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings.
431,934 Members | 1,677 Online
Bytes IT Community
+ Ask a Question
Need help? Post your question and get tips & solutions from a community of 431,934 IT Pros & Developers. It's quick & easy.

StreamWriter Adds FFFE at the start of the file with Unicode Encoding!!

P: n/a
Hi , all
I'm trying to write unicode to a file for another app (not developed with
vs2003) to read it. I used StreamWriter with unicode encoding.but I was
surprised that the streamwriter adds FFFE to the start of the file,which
stopes the other app from reading it!!
any idea how to stope it frome doing that,do I have to use another class
#####writer that supports unicode?

help me Please!
Thanks
majed
I did some code with diferent encoding and here is the result:
UTF7 48656C6C6F2B4143454149512D0D0A
Hello+ACEAIQ-..
DEFAULT 48656C6C6F21210D0A
Hello!!..
ASCII 48656C6C6F21210D0A
Hello!!..
BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A
....H.e.l.l.o.!.!....
UNICODE FFFE480065006C006C006F00210021000D000A00
...H.e.l.l.o.!.!.....
UTF8 EFBBBF48656C6C6F21210D0A
....Hello!!..

and here is the code

Imports System

Imports System.Text

Imports System.IO

Class filestream

Public Shared Sub main()

Dim ASCIIStream As New StreamWriter("ASCIIStream.txt", False,
System.Text.Encoding.ASCII)

Dim BigEndianUnicodeStream As New StreamWriter("BigEndianUnicodeStream.txt",
False, System.Text.Encoding.BigEndianUnicode)

Dim UnicodeStream As New StreamWriter("UnicodeStream.txt", False,
System.Text.Encoding.Unicode)

Dim DefaultStream As New StreamWriter("DefaultStream.txt", False,
System.Text.Encoding.Default)

Dim UTF7Stream As New StreamWriter("UTF7Stream.txt", False,
System.Text.Encoding.UTF7)

Dim UTF8Stream As New StreamWriter("UTF8Stream.txt", False,
System.Text.Encoding.UTF8)

ASCIIStream.WriteLine("Hello!!")

ASCIIStream.Close()

ASCIIStream = Nothing

BigEndianUnicodeStream.WriteLine("Hello!!")

BigEndianUnicodeStream.Close()

BigEndianUnicodeStream = Nothing

UnicodeStream.WriteLine("Hello!!")

UnicodeStream.Close()

UnicodeStream = Nothing

DefaultStream.WriteLine("Hello!!")

DefaultStream.Close()

DefaultStream = Nothing

UTF7Stream.WriteLine("Hello!!")

UTF7Stream.Close()

UTF7Stream = Nothing

UTF8Stream.WriteLine("Hello!!")

UTF8Stream.Close()

UTF8Stream = Nothing

Console.WriteLine ("Done!)

End Sub

End Class
Jul 21 '05 #1
Share this Question
Share on Google+
4 Replies


P: n/a
Majed,
Sounds like a bug in your other app!

FFFE is the byte order mark of Unicode, it signifies to Unicode that the
bytes are little endian. While FEFF signifies to Unicode that the bytes are
big endian!

Notice that in your samples, FEFF is Big Endian
BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A
...H.e.l.l.o.!.!....
, while FFFE is little endian: UNICODE FFFE480065006C006C006F00210021000D000A00
..H.e.l.l.o.!.!.....
You can prevent the byte order mark from being written by creating a new
UnicodeEncoding object that you pass as the Encoding parameter of the
STreamWriter constructor.

Something like(untested):

' little endian, no byte order marks
Dim encoding As New UnicodeEncoding(False, False)

Dim stream as FileStream
Dim writer As New StreamWriter(stream, encoding)

Of course you will need to be certain that you other app does not have an
issue with little endian verses big endian Unicode characters.

Hope this helps
Jay

"Majed" <am******@hotmail.com> wrote in message
news:%2***************@TK2MSFTNGP11.phx.gbl... Hi , all
I'm trying to write unicode to a file for another app (not developed with
vs2003) to read it. I used StreamWriter with unicode encoding.but I was
surprised that the streamwriter adds FFFE to the start of the file,which
stopes the other app from reading it!!
any idea how to stope it frome doing that,do I have to use another class
#####writer that supports unicode?

help me Please!
Thanks
majed
I did some code with diferent encoding and here is the result:
UTF7 48656C6C6F2B4143454149512D0D0A
Hello+ACEAIQ-..
DEFAULT 48656C6C6F21210D0A
Hello!!..
ASCII 48656C6C6F21210D0A
Hello!!..
BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A
...H.e.l.l.o.!.!....
UNICODE FFFE480065006C006C006F00210021000D000A00
..H.e.l.l.o.!.!.....
UTF8 EFBBBF48656C6C6F21210D0A
...Hello!!..

and here is the code

Imports System

Imports System.Text

Imports System.IO

Class filestream

Public Shared Sub main()

Dim ASCIIStream As New StreamWriter("ASCIIStream.txt", False,
System.Text.Encoding.ASCII)

Dim BigEndianUnicodeStream As New StreamWriter("BigEndianUnicodeStream.txt", False, System.Text.Encoding.BigEndianUnicode)

Dim UnicodeStream As New StreamWriter("UnicodeStream.txt", False,
System.Text.Encoding.Unicode)

Dim DefaultStream As New StreamWriter("DefaultStream.txt", False,
System.Text.Encoding.Default)

Dim UTF7Stream As New StreamWriter("UTF7Stream.txt", False,
System.Text.Encoding.UTF7)

Dim UTF8Stream As New StreamWriter("UTF8Stream.txt", False,
System.Text.Encoding.UTF8)

ASCIIStream.WriteLine("Hello!!")

ASCIIStream.Close()

ASCIIStream = Nothing

BigEndianUnicodeStream.WriteLine("Hello!!")

BigEndianUnicodeStream.Close()

BigEndianUnicodeStream = Nothing

UnicodeStream.WriteLine("Hello!!")

UnicodeStream.Close()

UnicodeStream = Nothing

DefaultStream.WriteLine("Hello!!")

DefaultStream.Close()

DefaultStream = Nothing

UTF7Stream.WriteLine("Hello!!")

UTF7Stream.Close()

UTF7Stream = Nothing

UTF8Stream.WriteLine("Hello!!")

UTF8Stream.Close()

UTF8Stream = Nothing

Console.WriteLine ("Done!)

End Sub

End Class

Jul 21 '05 #2

P: n/a
hi jay
the other app is Ntbackup which saves its backup files list in unicode
without FFFE at the start of the file. any idea how can I remove it from the
file.
TIA
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message
news:ea*************@TK2MSFTNGP10.phx.gbl...
Majed,
Sounds like a bug in your other app!

FFFE is the byte order mark of Unicode, it signifies to Unicode that the
bytes are little endian. While FEFF signifies to Unicode that the bytes are big endian!

Notice that in your samples, FEFF is Big Endian
BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A
...H.e.l.l.o.!.!....


, while FFFE is little endian:

Jul 21 '05 #3

P: n/a
Majed,
any idea how can I remove it from the
file. I take it you did not read my response! As I indicated in my response how
you remove it from the file!

Hope this helps
Jay
"Majed" <am******@hotmail.com> wrote in message
news:e1**************@TK2MSFTNGP12.phx.gbl... hi jay
the other app is Ntbackup which saves its backup files list in unicode
without FFFE at the start of the file. any idea how can I remove it from the file.
TIA
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message
news:ea*************@TK2MSFTNGP10.phx.gbl...
Majed,
Sounds like a bug in your other app!

FFFE is the byte order mark of Unicode, it signifies to Unicode that the
bytes are little endian. While FEFF signifies to Unicode that the bytes

are
big endian!

Notice that in your samples, FEFF is Big Endian
BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A
...H.e.l.l.o.!.!....


, while FFFE is little endian:


Jul 21 '05 #4

P: n/a
jay,
i'm sorry about that,I was late up because of this problem. yuor reply was
great and did solve it.
tahnks and sorry again.:)
majed
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message
news:us**************@TK2MSFTNGP09.phx.gbl...
Majed,
any idea how can I remove it from the
file.

I take it you did not read my response! As I indicated in my response how
you remove it from the file!

Hope this helps
Jay
"Majed" <am******@hotmail.com> wrote in message
news:e1**************@TK2MSFTNGP12.phx.gbl...
hi jay
the other app is Ntbackup which saves its backup files list in unicode
without FFFE at the start of the file. any idea how can I remove it from

the
file.
TIA
"Jay B. Harlow [MVP - Outlook]" <Ja************@msn.com> wrote in message news:ea*************@TK2MSFTNGP10.phx.gbl...
Majed,
Sounds like a bug in your other app!

FFFE is the byte order mark of Unicode, it signifies to Unicode that the bytes are little endian. While FEFF signifies to Unicode that the
bytes are
big endian!

Notice that in your samples, FEFF is Big Endian
> BIGENDIANUNICODE FEFF00480065006C006C006F00210021000D000A
> ...H.e.l.l.o.!.!....

, while FFFE is little endian:



Jul 21 '05 #5

This discussion thread is closed

Replies have been disabled for this discussion.