Solved

Appending data to existing file

Posted on 2000-05-09
8
219 Views
Last Modified: 2010-04-04
Appending data to existing file

var

C : String;
D : String;
F : Textfile

begin

C := #$3A+#$3B
D := #$00+#$2A

AssignFile (F, 'mama.txt');
Rewrite(F);
Writeln(F, C);
CloseFile(F);

AssignFile (F, 'mama.txt');
Append(F);
Writeln(F, D);
CloseFile(F);

end;

Every time you append to the 'mama.txt' file it tends to add a #$0D+#$0A which is exactly the same as #$0D, #$0A
From my knowledge its seems to be a [Ctrl+Z] in hex form
Does anyone know how to get rid of that extra #$0D+#$0A so that everything I append to a file is in continous line or continous string.

Ive tried this way

Assignfile (F, 'mama.txt');
Rewrite (F);
Writeln(F, C);
Writeln(F, D);

but it adds a [ASCII 26] which is not what I want

This is the extract from the Delphi Help Manual documenting the Append procedure

'If a Ctrl+Z (ASCII 26) is present in the last 128-byte block of the file, the current file position is set so that the next character added to the file overwrites the first Ctrl+Z in the block. In this way, text can be appended to a file that terminates with a Ctrl+Z.'

does anyone know how to overcome this problem?
0
Comment
Question by:Ben_iti
  • 2
  • 2
  • 2
  • +2
8 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 2792091
hi ben,

writeln appends alraedy$0D$0A
use write instead

#26 is allways added as file-end flag for a textfile, you can't get rid of it, if your filetyp is text.

meikl
0
 
LVL 10

Expert Comment

by:ECollin
ID: 2792093
Hi,

You can use Write instead of WriteLn.
Writeln adds the $0D,$0A at the end of the line.

Emmanuel
0
 
LVL 15

Accepted Solution

by:
simonet earned 60 total points
ID: 2792130

$D + $A  is the End-Of-Line marker. It's what makes the next character appear in the next line of the text file.

$D = CR = carriage return -> Makes the insertion point move to the beginning of the line.
$A = LF = Line feed -> Makes the insertion point move to the next line.

If you want your entire text to appear in a single line, then you can replace the WRITELN() function for WRITE() safely. Otherwise, if each entry is to appear on a different line of text, then you must keep the WRITELN() function.

Yours,

Alex
0
 
LVL 1

Expert Comment

by:saulite
ID: 2796049
If you don't want #$0D+#$0A in every record, you must use

  write(F,C);
  write(F,D);

Instead of writeLN. It's because writeLN adds $0D+$0A, bur write - don't
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 27

Expert Comment

by:kretzschmar
ID: 2796463
saulite, do you think that it is fair to repaet comments as answer?

i recommend that you withdraw your answer
0
 

Author Comment

by:Ben_iti
ID: 2816500
im sorry but im going to have to unaccept your answer
thanks

Ben
0
 

Author Comment

by:Ben_iti
ID: 2824912
Congratulations Alex

The points go to you
Your answer included further documentation on the subject.

Thanks

Ben
0
 
LVL 15

Expert Comment

by:simonet
ID: 2825435
Thanks Ben. Good luck!

Alex
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now