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Quickly retrieve the lines from a text file

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Submitted on: 1/1/2015 4:50:00 AM
By: Bob Brown (from psc cd)  
Level: Intermediate
User Rating: By 7 Users
Compatibility: Delphi 5, Delphi 4, Pre Delphi 4
Views: 1875
 
     This function quickly retrieves a range of lines from a text file.

 
				
Quickly retrieve the lines from a text file

If you need a quick function to get a line from a text file, try this one. It's very simple to use, for example:

Writeln('The 2nd line in c:\autoexec.bat is '+GetLinesFromFile('c:\autoexec.bat',2,2)[0]);

functionGetLinesFromFile(filename:string; linestart, lineend:integer) : TStringList;
(*
// Name : GetLinesFromFile
// Purpose : Returns a series of lines from a text file, starting at linestart and going to lineend
// Date : 12 Feb 2001
// Comments :
*)
var
  fn : textfile;
  c : word;
  Line : String;
begin
  Result:=TStringList.Create;
  AssignFile(fn,filename);
  Reset(fn);
  for c:=0 to LineStart do
    ReadLn(fn,Line);
  for c:=LineStart to LineEnd do
  begin
    Result.Add(Line);
    ReadLn(fn,Line);
  end;
  CloseFile(fn);
end;

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