Lazarus Pascal

StringBuilder GetBefore

Demonstrates the StringBuilder.GetBefore method.

The GetBefore method was added in Chilkat v9.5.0.77

Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.StringBuilder;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  sb: TStringBuilder;
  removeFlag: Boolean;
  marker: string;
  substr: string;

begin
  success := False;

  sb := TStringBuilder.Create;
  success := sb.Append('www.chilkatsoft.com');

  //  The GetBefore method returns the contents of the string up to but not including
  //  the marker string.  If the remove flag is True, then both the returned string AND
  //  the marker are removed.
  removeFlag := False;
  marker := '.';
  substr := sb.GetBefore(marker,removeFlag);
  WriteLn('substr = ' + substr);
  WriteLn('sb contains: ' + sb.GetAsString());

  //  Output:
  //  substr = www
  //  sb contains: www.chilkatsoft.com

  removeFlag := True;
  substr := sb.GetBefore(marker,removeFlag);
  WriteLn('substr = ' + substr);
  WriteLn('sb contains: ' + sb.GetAsString());

  //  Output:
  //  substr = www
  //  sb contains: chilkatsoft.com

  //  If the marker is not found, and the removeFlag is True,
  //  then the entire string is returned and the sb is cleared.
  //  For example:
  sb.Clear();
  sb.Append('111--222--333--444');
  marker := '--';
  removeFlag := True;
  while (sb.Length > 0) do
    begin
      substr := sb.GetBefore(marker,removeFlag);
      WriteLn('substr = ' + substr + ', sb contains: ' + sb.GetAsString());
    end;

  //  Output is:
  //  substr = 111, sb contains: 222--333--444
  //  substr = 222, sb contains: 333--444
  //  substr = 333, sb contains: 444
  //  substr = 444, sb contains: 


  sb.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.