Qt

Installation

Ubuntu:
apt install libgl1-mesa-dev

apt-get install essential cmake gdb
qt-unified-linux-x64-2.0.5-online.run
#Benutzer: qt.io <at> h*.de
ln -s /opt/Qt/5.8/gcc_64/bin /usr/lib/x86_64-linux-gnu/qt5

Links

• QtCreator
• g++

RegExpr

QRegularExpression regExpr("(\\d+)x(\\d+)");
QRegularExpressionMatch match = regExpr.match(line);
if (match.hasMatch()){
   QString width = match.captured(1);
   QString height = match.captured(2);
}

QRegularExpression re("(\\w+)");
QRegularExpressionMatchIterator i = re.globalMatch(line);
while(i.hasNext()){
   QRegularExpressionMatch match = i.next();
   QString word = match.captured(1);
}

File Handling

  QFile output(fileName);
  if( ! output.open(QIODevice::WriteOnly) )
  {
    error();
  } else {
    QTextStream os(&output);
    os << "Hi world!\n";
    output.close();
  }

Datum/Zeit

QDateTime::currentDateTime().toString("yyyy.MM.dd hh:mm:ss");

QString/QByteArray

QString::fromUtf8(const QByteArray &str);
QByteArray data = message.toUtf8();

QMap

for (i = map.constBegin(); i != map.constEnd(); ++i)
    cout << i.key() << ": " << i.value() << endl;

UI

• Alle Widgets auf dem Container herrichten. Widgets selektieren: Rechtsklick: Layout
• Layout in der obersten Ebene eines Containers (auch Mainwindow): Rechtsklick auf Containergrund: Layout