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dynamically creating variable names??

Here's a good one...I want to 'dynamically' create an unknown number of text output files based on a number (say between 1 and 100) the user inputs. If he inputs a 45, then I have to create 45 separate text output files on the fly. Is there any way to do this elegantly...or at all?
  Can a declaration like this be done? ...

outfile : array[1..100] of text;

...that would be perfect..then I could just go like this:

for x:=1 to {whatever # was input} do
    assignfile(outfile[x], 'file'+Inttostr(x)+'.txt');

...or am I just dreaming?

Cheers!
   Shawn Halfpenny

P.S: By the way, I'm using Delphi 3.
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aztec
Asked:
aztec
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1 Solution
 
Stuart_JohnsonCommented:
Shawn,

I just did this:

procedure TForm1.Button1Click(Sender: TObject);
Type FileInfo = Record
        TFile: TextFile;
        Active: Boolean;
     End;

var F: Array[1..100] of FileInfo;
    I: Integer;

begin
   For i := 1 to 100 do begin
      AssignFile(F[i].TFile, 'C:\'+IntTostr(I)+'.Txt');
      Rewrite(F[i].TFile);
      F[i].Active := True;
   End;
   For i := 1 to 100 do begin
      CloseFile(F[i].TFile);
      F[i].Active := False;
   End;
End;

And it worked perfectly!  The reason I did it as a record was so you could tell in an instant if they file was open or not.  This created and held open 100 files at once, then closed them.

Hope this helps you.

Regards,


Stu.
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bryan7Commented:
.. of course that you can..

just try it. sorry, I can't use delphi right now, but I'm sure you can
if you get an error like " incompatible.. string and PChar "
in the filename at Assignfile, then try this:

i.e: if the variable with files names is FILENAMES, then do this:
PChar(FILENAMES)    in stead of only         FILENAMES


bryan

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Stuart_JohnsonCommented:
Bryan,

I dont know if I follow, but I'll have a shot.  The AssignFile procedure has to be passed a string, not a PChar.  That is probably why you where getting the error.

Is that what you mean?  Sorry if its not.  Let me know if Im completely off track :)

Cheers!

Stu

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bryan7Commented:
emm ,no.
I didn't remember if it needed string or PChar.
The thing is that I can't use delphi right now to check it.

bryan

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Stuart_JohnsonCommented:
No worries, just let me know when you get a chance.

Have fun!!

Stu
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aztecAuthor Commented:
Right on...works fine! Thanks!
   Shawn
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Stuart_JohnsonCommented:
No worries mate, glad to be of service!!

Stu.
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