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transform the CR/LF characters to \r\n

Posted on 2004-09-14
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Last Modified: 2008-02-01
I have text data from FoxPro (memo).  There are a few paragraphs in a single transaction that I pull back into a WIN FORM dataset to present in a textbox.  No edit here, just read only.

What is the best way to repalce the CR/LF with the escape sequences that my WinForms will use?

Im pretty green at reqular expressions if that is the best way to handle this.

TIA



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Question by:srussell705
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Expert Comment

by:AvonWyss
ID: 12054647
CR==\r
LF==\n
Therefore, if the sequence is CRLF, you should not need any conversion.
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Author Comment

by:srussell705
ID: 12055517
Thanks but trust me.  This is not the answer.

When I fill my textbox, I see two boxes butted next to one another for CR & LF in my display.  If I were to copy the text here it would break according to CR&LF.  

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Expert Comment

by:AvonWyss
ID: 12055532
Could it be that the data is LFCR instead of CRLF? Because if it IS CRLF, you'll not see boxes...
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Expert Comment

by:AvonWyss
ID: 12055552
You can try this:

string output=Regex.Replace(input, @"\r\n|\n\r|\r|\n", "\r\n", RegexOptions.SingleLine);
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Expert Comment

by:Agarici
ID: 12056223
i suggest replacing "\r\n" with Environment.NewLine

i guess your problem is because the textbox does not convert tex text corectly to unicode


hth.
A.
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Expert Comment

by:Agarici
ID: 12056257
btw you wont need regular expressions to do that
all you need is : YourTextBox.Text = YourTextBox.Text.Replace( "\r\n", Environment.NewLine );

hth.
A.
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Expert Comment

by:AvonWyss
ID: 12056726
Agarici, on Windows, Environment.Newline is always \r\n, so that you suggestion will just reproduce the string which was already present without changing anything.
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by:srussell705
ID: 12057277

Thanks.  I was trying to figure out how to do the same but replace the \r\n with CHR(13) + CHR(10)

I'm playing with :
Char[] chars;
Byte[] bytes = new Byte[] {13,  10 };

ASCIIEncoding ascii = new ASCIIEncoding();


chars = ascii.GetChars(bytes,0,1) ;

But I'm not there yet.

any ideas?
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Expert Comment

by:AvonWyss
ID: 12057359
\r\n IS CHR(13) + CHR(10) - there is nothing to replace!
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by:srussell705
ID: 12057408
Not getting funny now :(

my code:
                  Char[] chars;
                  Byte[] bytes = new Byte[] {13,  10 };

                  ASCIIEncoding ascii = new ASCIIEncoding();


                  chars = ascii.GetChars(bytes,0,2) ;//  " characters used to decode bytes." ;

                  int ln1 = 0;
                  string lcd ="";
                  foreach (Char c in chars)
                  {
                        lcd += chars[ln1] ;//Console.Write("[{0}]", c);
                        ln1 ++;
                  }
                  
                  mmTextBox2.Text = mmTextBox2.Text.Replace( lcd, Environment.NewLine );

lcd translates to "\r\n", and does no real work in the replacement as iI step through the code :(


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Expert Comment

by:AvonWyss
ID: 12057466
That's what I said, right?
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AvonWyss earned 800 total points
ID: 12057601
Did you even bother to see what line endings you get? And to try if the given regex works?
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Author Comment

by:srussell705
ID: 12058485
I went back to the regEx example and bingo.  I wanted to work harder and not smarter I guess.

Thanks to all!!!
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Expert Comment

by:AvonWyss
ID: 12058541
Good to hear it worked for you. So there were other line breaks than \r\n in the string... ;-)
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