(Delphi ActiveX) StringBuilder GetBefore

Demonstrates the StringBuilder.GetBefore method.

The GetBefore method was added in Chilkat v9.5.0.77

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
sb: TChilkatStringBuilder;
success: Integer;
removeFlag: Integer;
marker: WideString;
substr: WideString;

begin
sb := TChilkatStringBuilder.Create(Self);
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 1, then both the returned string AND
// the marker are removed.
removeFlag := 0;
marker := '.';
substr := sb.GetBefore(marker,removeFlag);
Memo1.Lines.Add('substr = ' + substr);
Memo1.Lines.Add('sb contains: ' + sb.GetAsString());

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

removeFlag := 1;
substr := sb.GetBefore(marker,removeFlag);
Memo1.Lines.Add('substr = ' + substr);
Memo1.Lines.Add('sb contains: ' + sb.GetAsString());

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

// If the marker is not found, and the removeFlag is 1,
// then the entire string is returned and the sb is cleared.
// For example:
sb.Clear();
sb.Append('111--222--333--444');
marker := '--';
removeFlag := 1;
while (sb.Length > 0) do
  begin
    substr := sb.GetBefore(marker,removeFlag);
    Memo1.Lines.Add('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: 
end;