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procedure TForm1.AlsPDFexportieren1Click(Sender: TObject);
begin
   if SaveDialog_pdf.Execute then
          begin
 with TGDIPages.Create(self) do
  try
   Printer.BeginDoc;
    Font.Size := 9;
    AppendRichEdit(RichEdit1.Handle);
   EndDoc;

               if TFileName(SaveDialog_pdf.FileName) = '*.pdf' then
                    case SaveDialog_pdf.FilterIndex of
          0:  dateiName := ChangeFileExt(SaveDialog_pdf.FileName,'.pdf');
          end
          else
           SaveDialog_pdf.FileName :=ChangeFileExt(SaveDialog_pdf.FileName,'.pdf');
           dateiName :=ChangeFileExt(SaveDialog_pdf.FileName,'.pdf');
           ExportPDF(TFileName(SaveDialog_pdf.FileName),true,false);
          finally
      Free;
   end;
    END;
end;