How to resolve the algorithm Read entire file step by step in the Delphi programming language

Published on 12 May 2024 09:40 PM
#Delphi

How to resolve the algorithm Read entire file step by step in the Delphi programming language

Table of Contents

Problem Statement

Load the entire contents of some text file as a single string variable. If applicable, discuss: encoding selection, the possibility of memory-mapping. Of course, in practice one should avoid reading an entire file at once if the file is large and the task can be accomplished incrementally instead (in which case check File IO); this is for those cases where having the entire file is actually what is wanted.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Read entire file step by step in the Delphi programming language

Source code in the delphi programming language

program ReadAll;

{$APPTYPE CONSOLE}

uses Classes;

var
  i: Integer;
  lList: TStringList;
begin
  lList := TStringList.Create;
  try
    lList.LoadFromFile('c:\input.txt');
    // Write everything at once
    Writeln(lList.Text);
    // Write one line at a time
    for i := 0 to lList.Count - 1 do
      Writeln(lList[i]);
  finally
    lList.Free;
  end;
end.


program ReadAll;

{$APPTYPE CONSOLE}

uses
  SysUtils, IOUtils;

begin
// with default encoding:
  Writeln(TFile.ReadAllText('C:\autoexec.bat'));
// with encoding specified:
  Writeln(TFile.ReadAllText('C:\autoexec.bat', TEncoding.ASCII));
  Readln;
end.

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