How to Convert Simple RichText to HTML tags in Delphi?

Question

You may say that there are lots of discussions about this in stackOverflow, but most of them are more complicated than what I need and mostly for other languages.

I have

Answer 1

After trying many different solutions which did not gave accurate results, I was inspired by this solution: Convert RTF to HTML and HTML to RTF.

The idea is that TWebBrowser control (in design/edit mode) can handle and convert correctly Rich text format when it was pasted from the clipboard.

uses SHDocVw, MSHTML;

function ClipboardToHTML(AParent: TWinControl): WideString;
var
  wb: TWebBrowser;

  function WaitDocumentReady: Boolean;
  var
    StartTime: DWORD;
  begin
    StartTime := GetTickCount;
    while wb.ReadyState <> READYSTATE_COMPLETE do
    begin
      Application.HandleMessage;
      if GetTickCount >= StartTime + 2000 then // time-out of max 2 sec
      begin
        Result := False; // time-out
        Exit;
      end;
    end;
    Result := True;
  end;
begin
  Result := '';
  wb := TWebBrowser.Create(nil);
  try
    wb.Silent := True;
    wb.Width := 0;
    wb.Height := 0;
    wb.Visible := False;
    TWinControl(wb).Parent := AParent;
    wb.HandleNeeded;
    if wb.HandleAllocated then
    begin
      wb.Navigate('about:blank');
      (wb.Document as IHTMLDocument2).designMode := 'on';
      if WaitDocumentReady then
      begin
        (wb.Document as IHTMLDocument2).execCommand('Paste', False, 0);
        Result := (wb.Document as IHTMLDocument2).body.innerHTML;
      end;
    end;
  finally
    wb.Free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  RichEdit1.SelectAll;
  RichEdit1.CopyToClipboard;

  ShowMessage(ClipboardToHTML(Self));
end;