var filename = "demofile.txt";
// write file
var file = new DlxFile(filename, DlxApp.FILEOPEN_WRITETEXT);
if (file.IsValid())
{
  for (var i = 0; i <= 90; i++)
	file.Write(i.toString() + "° : " + Math.sin(i / 180 * Math.PI) + "\n");
  file.Close();
}
// read file
file = new DlxFile(filename, DlxApp.FILEOPEN_READTEXT);
if (file.IsValid())
{
  DlxApp.Printf("File size: %i characters", file.GetLength());
  file.Seek(file.GetLength() /2, DlxApp.FILESEEK_BEGIN);
  DlxApp.Printf("Position; %i", file.GetPosition());
  while (!file.IsEOF())
    DlxApp.Printf("-: %s", file.ReadLine());
  DlxApp.Printf("Position; %i", file.GetPosition());
  file.Close();
}
else DlxApp.Printf("File not found.");