Hi,

Thanks for the replies, I have the following code working well,
Qt Code: 
  1. void Loader::saveToFile()
  2. {
  3.      QString fileName = QFileDialog::getSaveFileName( this, tr("Save File As..."), QDir::homePath(), tr("txt (*.txt)"));
  4.      if (fileName.isEmpty())
  5.          return;
  6.      else 
  7.     {
  8.          QFile file(fileName);
  9.          if (!file.open(QIODevice::WriteOnly))
  10.          {
  11.              QMessageBox::information(this, tr("Unable to open file"), file.errorString());
  12.              return;
  13.          }
  14.           // Need to find a way to clear all present data in file, if the file already exists.
  15.          QDataStream out(&file);
  16.          out.setVersion(QDataStream::Qt_4_3);
  17.          out << channels;  // "channels" is a QMap<QString, QString> which has the relevant information already inserted.
  18.      }
  19.  }
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The problem I now have is that if I open a file that already exists, I overwrite my data to this file, but any original data that is not overwritten still remains... what I need is a way to delete all original data in the file before I write my new data.

Is there a simple way to delete all data in a file?

Thanks