Streamreader problem

[Jack Russell]

I have the following code in VB.net 2003

Dim s As String
Dim sr As StreamReader = New StreamReader("test.txt", New
UTF7Encoding)
s = sr.ReadLine
Debug.Write(s)

If the string read is 1+.03 it converts it to 1.3

If I remove the UTF7encoding option it does not.

Why should the encoding cause a text string to do arithmetic work? and
can I prevent it.

Thanks

Jack Russell

 

[Ryan S. Thiele]

I think it's in the UTF encoding.
The '+' may not be a valid charactor, so it ignores it.
Can you avoid UTF7? UTF8 seems to work fine.

 

[Jack Russell]

I think it's in the UTF encoding.
The '+' may not be a valid charactor, so it ignores it.
Can you avoid UTF7? UTF8 seems to work fine.

You are right, I just discovered that UTF7 regards + as an escape character.

I have files written by the old Fileopen, printline,fileclose method

I use streamreader to read these as it seems much faster than openfile,
lineinput.

It all works fine until I try to read files containing French such as

äüöéèà

The only way I can find to read these is with UTF7, everything else
ignores them.

Any ideas gratefully received.

Jack

 

[Ryan S. Thiele]

Try Binary:

Dim sr As New BinaryReader(File.OpenRead("test.txt"))
Do While sr.PeekChar >= 0
Console.Write(Chr(sr.ReadByte))
Loop
sr.Close()

Notice I used chr code to convert bye to character.


--
Thiele Enterprises - The Power Is In Your Hands Now!


--

I think it's in the UTF encoding.
The '+' may not be a valid charactor, so it ignores it.
Can you avoid UTF7? UTF8 seems to work fine.

You are right, I just discovered that UTF7 regards + as an escape character.

I have files written by the old Fileopen, printline,fileclose method

I use streamreader to read these as it seems much faster than openfile,
lineinput.

It all works fine until I try to read files containing French such as

äüöéèà

The only way I can find to read these is with UTF7, everything else
ignores them.

Any ideas gratefully received.

Jack

 

[Jack Russell]

Try Binary:

Dim sr As New BinaryReader(File.OpenRead("test.txt"))
Do While sr.PeekChar >= 0
Console.Write(Chr(sr.ReadByte))
Loop
sr.Close()

Notice I used chr code to convert bye to character.

Well that works thanks but with the large files that I am reading it is
horrendously slow which is why I went to streamreader in the first
place!! Any other ideas?

 

[Chris Dunaway]

Well that works thanks but with the large files that I am reading it is
horrendously slow which is why I went to streamreader in the first
place!! Any other ideas?

Have you tried Encoding.Default instead of UTF7? What encoding was
used to write the file?

 

[Ryan S. Thiele]

Are you editing the text? Use a richtext box...

Me.RichTextBox1.LoadFile("Text.exe", RichTextBoxStreamType.PlainText)


--
Thiele Enterprises - The Power Is In Your Hands Now!

--

Try Binary:

Dim sr As New BinaryReader(File.OpenRead("test.txt"))
Do While sr.PeekChar >= 0
Console.Write(Chr(sr.ReadByte))
Loop
sr.Close()

Notice I used chr code to convert bye to character.

Well that works thanks but with the large files that I am reading it is
horrendously slow which is why I went to streamreader in the first
place!! Any other ideas?

 

[Jack Russell]

Have you tried Encoding.Default instead of UTF7? What encoding was
used to write the file?

I do not know what encoding was used, it was written using the "old" VB
method of file open, printline, file close. I have not been able to find
out what encoding that uses. Just to recap my problem the file can
contain foregin characters such as äüöéèà. If I do not specify any
encoding when I open the streamreader these get lost. If I specify UTF7
they are found but UTF7 treats + as an escape character. I will try
default but ...

 

[Andrew Morton]

I do not know what encoding was used, it was written using the "old"
VB method of file open, printline, file close. I have not been able
to find out what encoding that uses.

I suspect you'll find the bits you need in the help at the
System.Text.ASCIIEncoding section, and something to do with Windows-1252 or
ISO 8859-1.

If you look at your file with a hex editor, do the accented characters
correspond to the ones in this table:-
http://en.wikipedia.org/wiki/Windows-1252

?

Also see http://en.wikipedia.org/wiki/ISO_8859-1.

HTH

Andrew