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Need code quick. How to add text to Memo and delete/add things on user input?

Posted on 2006-06-17
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Last Modified: 2010-04-05
Hey,

Usually I would try to figure this out, but I just don't have time so I thought I'd ask here.

Basically I am trying to write a program that reads a file (which is a list of files that have a number/letters in front of them, which are a specific length e.g. 8 characters). I need the program to open a file and read it and put that info in the Memo. Then I want a Userinput box where the user enters how long the number at the beginning is, and then click a command button to delete the characters.

This is the code I was trying to use to open the file

procedure TForm1.Open1Click(Sender: TObject);
var
  CurrentLine: string;
  DataFile: textfile;
begin
  //open a data file, reading it line by line
      OpenDialog1.Filter := 'Text files (*.txt)|*.TXT';
      if OpenDialog1.Execute then
      begin
      AssignFile(DataFile, OpenDialog1.FileName);
      Filename:= OpenDialog1.FileName; //assign opendialog1.filename to the filename
      Reset(DataFile);  //reopen file
      while not eof(DataFile) do
        begin
          ReadLn(DataFile, CurrentLine);
          memo1.text := Currentline;
        end;
end;

Then I was going to use a similar code to delete the characters

delete(CurrentLine, 1, UserInput); - where userinput is an integer value that the user has entered.

I know this will be really easy for someone to do. I will give A to whoever does it.

Thanks in advance.
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Question by:shakoor_h
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6 Comments
 

Author Comment

by:shakoor_h
ID: 16927361
oh yeh the updated text needs to reload into the Memo and also have a possibility to save to a file.
0
 
LVL 13

Expert Comment

by:BlackTigerX
ID: 16927515
     if OpenDialog1.Execute then
      begin
         memo1.lines.LodFromFile(OpenDialog1.FileName);
....
0
 
LVL 6

Accepted Solution

by:
Amir Azhdari earned 1000 total points
ID: 16928349
procedure TForm1.open1Click(Sender: TObject);
var ts:TStrings;
    sd:TSaveDialog;
    i,UserInput:integer;
    s:string;
begin
OpenDialog1.Filter := 'Text files (*.txt)|*.TXT';
if OpenDialog1.Execute then
  begin
    ts:=TStringList.Create;
    ts.LoadFromFile(OpenDialog1.FileName);
    UserInput:=strtoint(InputBox('Enter the length to delete','Enter the length to delete','2'));
    for i:=0 to ts.count-1 do
     begin
      s:=ts.strings[i];
      delete(s,1,UserInput);
      ts.Strings[i]:=s;
     end;
    Memo1.Lines:=ts;
    sd:=TSaveDialog.Create(nil);
    sd.filter := 'Text files (*.txt)|*.TXT';
    if sd.Execute then
        ts.SaveToFile(sd.FileName);
    sd.Free;
    ts.Free;
  end;
end;
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Author Comment

by:shakoor_h
ID: 16929717
Exactly what I wanted. Obviously I edited it so that the functions were split up and added and insert text function as well. But at the moment I can only add to the beginning of a string. Is it possible to add to the end of a string?
0
 
LVL 6

Expert Comment

by:Amir Azhdari
ID: 16930440
in this case you should replace
delete(s,1,UserInput);
with
delete(s,Userinput,Length(s)-Userinput+1);
0
 
LVL 6

Expert Comment

by:Amir Azhdari
ID: 16930444
in this case you should replace
delete(s,1,UserInput);
with
delete(s,Userinput,Length(s)-Userinput+1);
0

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