QT hex, decimal, qbytearray, qstring data conversion

One 、QT QString Each character changes Plastic figure

First of all, it is not clear whether there is a better way , I write here a kind of ;

  QString textStr = "54326";

// first to QByteArray 
  QByteArray strArray = textStr.toLatin1();

  int arraySize = strArray.size();
  for(int i =0;i<arraySize;i++)
  {
     // get ASCII ;sub '0'
     int value = strArray[i]-48;
     qDebug()<< QString::number(value) <<" ";
  }

print out:

"5"  
"4"  
"3"  
"2"  
"6"

Two 、QString And int transformation

QString qstr = QString::number(123);

int i = atoi(qstr.toStdString().c_str());

You can do that ：int i = atoi(qstr.ascii());

3、 ... and 、QString And string, namely std::string

string s = qstr.toStdString();

QString qstr2 = QString::fromStdString(s)