Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  An INI file stores information in logical groupings, called “sections.” 
  Within each section, actual data values are stored in named keys. 
   
  [Section_Name] 
  Key_Name1=Value1 
  Key_Name2=Value2 
   
}

 uses
   IniFiles;

 // Write values to a INI file 

procedure TForm1.Button1Click(Sender: TObject);
 var
   ini: TIniFile;
 begin
   // Create INI Object and open or create file test.ini 
  ini := TIniFile.Create('c:\MyIni.ini');
   try
     // Write a string value to the INI file. 
    ini.WriteString('Section_Name', 'Key_Name', 'String Value');
     // Write a integer value to the INI file. 
    ini.WriteInteger('Section_Name', 'Key_Name', 2002);
     // Write a boolean value to the INI file. 
    ini.WriteBool('Section_Name', 'Key_Name', True);
   finally
     ini.Free;
   end;
 end;


 // Read values from an INI file 

procedure TForm1.Button2Click(Sender: TObject);
 var
   ini: TIniFile;
   res: string;
 begin
   // Create INI Object and open or create file test.ini 
  ini := TIniFile.Create('c:\MyIni.ini');
   try
     res := ini.ReadString('Section_Name', 'Key_Name', 'default value');
     MessageDlg('Value of Section:  ' + res, mtInformation, [mbOK], 0);
   finally
     ini.Free;
   end;
 end;

 // Read all sections 

procedure TForm1.Button3Click(Sender: TObject);
 var
    ini: TIniFile;
 begin
   ListBox1.Clear;
   ini := TIniFile.Create('MyIni.ini');
   try
     ini.ReadSections(listBox1.Items);
   finally
      ini.Free;
    end;
 end;

 // Read a section 

procedure TForm1.Button4Click(Sender: TObject);
 var
    ini: TIniFile;
 begin
   ini: = TIniFile.Create('WIN.INI');
   try
     ini.ReadSection('Desktop', ListBox1.Items);
   finally
     ini.Free;
   end;
 end;


 // Read section values 

procedure TForm1.Button5Click(Sender: TObject);
 var
   ini: TIniFile;
 begin
   ini := TIniFile.Create('WIN.INI');
   try
     ini.ReadSectionValues('Desktop', ListBox1.Items);
   finally
      ini.Free;
     end;
 end;

 // Erase a section 

procedure TForm1.Button6Click(Sender: TObject);
 var
    ini: TIniFile;
 begin
   ini := TIniFile.Create('MyIni.ini');
   try
     ini.EraseSection('My_Section');
   finally
     ini.Free;
   end;
 end;