Solved

write to a file

Posted on 1998-01-14
8
127 Views
Last Modified: 2010-04-04
Hi!

I need to apply some data to a file in Delphi 3, how do I do that? Code thanks
0
Comment
Question by:hh
  • 2
  • 2
  • 2
  • +2
8 Comments
 
LVL 2

Expert Comment

by:Waldek
ID: 1356600
Some data ? What?
0
 
LVL 8

Expert Comment

by:ZifNab
ID: 1356601
You can put everything to a file. What data do you want to write to a file. Here is a basic code example (for a textfile)

var
  F: TextFile;
  S: string;
begin
  if OpenDialog1.Execute then          { Display Open dialog box }
  begin
    AssignFile(F, OpenDialog1.FileName);   { File selected in dialog box } or
    AssignFile(F, 'name of file');
    Rewrite(F);
    S := Edit1.text;
    writeln(F, S);                          { write S to file }
    CloseFile(F);
  end;
end;

Look in the helpfile of delphi. It's all in the System unit
0
 

Author Comment

by:hh
ID: 1356602
I dont want a dialog box. The user shall press a button and a line of data should be added to a file. The data shall be automatically added to the file without confirmation from the user.
0
 
LVL 5

Expert Comment

by:JimBob091197
ID: 1356603
Well, hard-code the file name then, using ZifNab's example:

AssignFile(F, 'Name of file');
Etc.

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.

 

Author Comment

by:hh
ID: 1356604
but dosent ZifNab's example use a dialog box?
0
 
LVL 5

Expert Comment

by:JimBob091197
ID: 1356605
Yeah, so, take it out.

E.g.  Write "Hello there" to "C:\Test.txt"

procedure WriteHello;
var
  S: string;
  F: TextFile;
begin
  S := 'Hello there';
  AssignFile(F, 'C:\Test.txt');
  Rewrite(F);   // To append, use "Append(F);"
  Writeln(F, S);
  CloseFile(F);
end;

JB
0
 
LVL 8

Expert Comment

by:ZifNab
ID: 1356606
Like in the example (and JimBob explained)

You can use the procedure

AssignFile({filetype}, {string}) in many ways.

eg.
AssignFile(F, 'filename');

Just opens the file with the name 'filename'.

If you want to let the user chose the file, you can sue the OpenFiledialog, because this one returns a string when closed.

AssignFile(F, OpenDialog1.FileName);

Zif.
0
 

Accepted Solution

by:
JimL011598 earned 50 total points
ID: 1356607
I prefer to we the following method for write to files from Delphi.

    FileHandle := fileopen(FileName, fmOpenWrite);
    If FileHandle > 0
    then begin
         fileseek(FileHandle, 0, 2);  {position to end of file}
         filewrite(FileHandle, Buffer, length(Buffer)+1);
         fileclose(FileHandle);
         end
    else begin
         { handle error }
         end;
 
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

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…
In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
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, f…
Hi friends,  in this video  I'll show you how new windows 10 user can learn the using of windows 10. Thank you.

910 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

16 Experts available now in Live!

Get 1:1 Help Now