TOpenTextFileDialog (Delphi)

Description

This example shows how to use the TOpenTextFileDialog and the TSaveTextFileDialog to handle files with specific encodings.

Code

procedure TForm1.Button1Click(Sender: TObject);
var
  Encoding : TEncoding;
  EncIndex : Integer;
  Filename : String;
begin
  if OpenTxtDlg.Execute(Self.Handle) then
    begin
    //Selecting the file name and the encoding
    Filename := OpenTxtDlg.FileName;

    EncIndex := OpenTxtDlg.EncodingIndex;
    Encoding := OpenTxtDlg.Encodings.Objects[EncIndex] as TEncoding;

    //Checking if the file exists
    if FileExists(Filename) then
      //Display the contents in a memo based on the selected encoding.
      Memo1.Lines.LoadFromFile(FileName, Encoding)
    else
      raise Exception.Create('File does not exist.');
    end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  Encoding : TEncoding;
  EncIndex : Integer;
  Filename : String;
begin
  if SaveTxtDlg.Execute(Self.Handle) then
    begin
    //Selecting the file name and the encoding
    Filename := SaveTxtDlg.FileName;

    EncIndex := SaveTxtDlg.EncodingIndex;
    Encoding := SaveTxtDlg.Encodings.Objects[EncIndex] as TEncoding;

    //Checking if the file exists
    if FileExists(Filename) then
      raise Exception.Create('File already exists.')
    else
      //Save to file based on the selected encoding.
      Memo1.Lines.LoadFromFile(FileName, Encoding);
    end;

end;

procedure TForm1.FormCreate(Sender: TObject);
var
  encodings : TStrings;
begin
  OpenTxtDlg := TOpenTextFileDialog.Create(Self);
  SaveTxtDlg := TSaveTextFileDialog.Create(Self);

  // Create a new string list that holds encoding info.
  encodings := TStringList.Create();

  // Add some encodings to the list.
  encodings.AddObject('ASCII', TEncoding.ASCII);
  encodings.AddObject('UNICODE', TEncoding.Unicode);
  encodings.AddObject('UTF8', TEncoding.UTF8);

  OpenTxtDlg.Encodings.Assign(encodings);
  SaveTxtDlg.Encodings.Assign(encodings);

  OpenTxtDlg.Filter := 'Text files (*.txt)|*.TXT|XML files (*.xml)|*.XML|Any file (*.*)|*.*';
  SaveTxtDlg.Filter := 'Text files (*.txt)|*.TXT|XML files (*.xml)|*.XML|Any file (*.*)|*.*';

end;

Uses

• Vcl.ExtDlgs.TOpenTextFileDialog ( fr | de | ja )
• Vcl.ExtDlgs.TSaveTextFileDialog ( fr | de | ja )
• Vcl.ExtDlgs.TOpenTextFileDialog.Encodings ( fr | de | ja )
• Vcl.ExtDlgs.TOpenTextFileDialog.EncodingIndex ( fr | de | ja )
• System.Classes.TStrings.LoadFromFile ( fr | de | ja )