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Code: Alles auswählen

 

 while (!file.atEnd()) 
{
         QString line = file.readLine();
}

Code: Alles auswählen

Reading Files Directly

The following example reads a text file line by line:

     QFile file("in.txt");
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
         return;

     while (!file.atEnd()) {
         QByteArray line = file.readLine();
         process_line(line);
     }

The QIODevice::Text flag passed to open() tells Qt to convert Windows-style line terminators ("\r\n") into C++-style terminators ("\n"). By default, QFile assumes binary, i.e. it doesn't perform any conversion on the bytes stored in the file.
Using Streams to Read Files

The next example uses QTextStream to read a text file line by line:

     QFile file("in.txt");
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
         return;

     QTextStream in(&file);
     while (!in.atEnd()) {
         QString line = in.readLine();
         process_line(line);
     }

Code: Alles auswählen

   
QFile file("in.txt");
     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
         return;

     while (!file.atEnd()) {
         QByteArray line = file.readLine();
         // nun tue hier irgend etwas mit der ausgelesenen zeile 
     } 

Code: Alles auswählen

void
ImportExport::Import(void)
{
  QString strDataName;

  QFileDialog::Options options;

  QString strFileName = QFileDialog::getOpenFileName(0, tr("Parameter Map Open"), strDataName, tr("Parameter Map (*.map)"));

  QFile file(strFileName);

  QTextStream Text(&file);

  file.open(QFile::ReadOnly);
  
  while (!file.atEnd()) 
  {
    QByteArray strLine = file.readLine();

    if(strLine.startsWith("Version="))
    {
      QString strText = strLine.mid(8);

      strText.toDouble();  

      QMessageBox::information(0, tr("Save"), (strText));
    }
    else if(strLine.startsWith("Description="))
    {
      QString strText = strLine.mid(12);

      QMessageBox::information(0, tr("Save"), (strText));
    }
  }
}