FileListBox (Delphi)

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Description

This example uses a file listbox and a regular list box on a form. The following routine scans through the files listed in the file list box and lists the sizes of any selected files to the regular list box. To exercise the error condition, create a file in the Debug directory, start this application, and then delete the file. Now try to list the size of the deleted file. Set the MultiSelect and ExtendedSelect properties on the FileListBox.

Code

procedure TForm1.Button1Click(Sender: TObject);
var
  F: File;
  i, filehandle: Integer;
begin
  for i := 0 to (FileListBox1.Items.Count - 1) do begin
  try
    if FileListBox1.Selected[i] then 
    begin
      if not FileExists(FileListBox1.Items.Strings[i]) then
      begin
        MessageDlg('File: ' + FileListBox1.Items.Strings[i] +
                   ' not found', mtError, [mbOk], 0);
        Continue;
      end;
      filehandle:=  FileOpen(FileListBox1.Items.Strings[i], fmOpenWrite);
      if (filehandle = -1) then
      begin
        MessageDlg('File: ' + FileListBox1.Items.Strings[i] +
                   ' cannot be opened with access mode fmOpenWrite.', mtError, [mbOk], 0);
        Continue;
      end
      else
        FileClose(filehandle);

      AssignFile(F, FileListBox1.Items.Strings[i]);
      Reset(F, 1);
      ListBox1.Items.Add(
        FileListBox1.Items.Strings[i] + ': ' + IntToStr(FileSize(F)));
      CloseFile(F);
    end;
   finally
   { Do something here. }
   end;
  end;
end;

Uses

Personal tools
Assistance