QT communicate through QProcess with Notepad.exe - qt

Question

I would like to start notepad.exe from QT and then for example write "Hello Notepad" to the input-area of Notepad from QT!
What I managed to do, is starting notepad from QT. But what ever I try I can't fill in the text in the Notepad-textedit area.
.h-File:
#ifndef MATLABPROCESS
#define MATLABPROCESS
#include "QObject"
#include <QProcess>
#include <QDebug>
class MatlabProcess : public QObject{
Q_OBJECT
public:
// enum State {IDLE, ERRORX, WRITING};
//State myState;
QProcess* myProcess;
explicit MatlabProcess (QObject* parent = 0) : QObject(parent) {
myProcess = new QProcess(this);
// myState = IDLE;
QObject::connect(myProcess, SIGNAL(readyReadStandardOutput()), SLOT(writing_stream()));
}
Q_INVOKABLE bool startMatlab(){
// QString program = "\"C:/Program Files (x86)/MATLAB/R2012a/bin/matlab.exe\"";
QString program = "\"C:/FlorianK/notepad.exe\"";
myProcess->start(program);
if (!myProcess->waitForStarted(-1)) return false;
qDebug() << "program started";
return true;
}
Q_INVOKABLE bool stopMatlab(){
//TODO
return false;
}
Q_INVOKABLE bool writeSomething(){
QByteArray script = "Hello Notepad\n";
qDebug() << myProcess->write(script);
qDebug() << myProcess->waitForFinished();
QByteArray result = myProcess->readAll();
qDebug() << "result: " + result;
}
private slots:
void writing_stream() {
if (!myProcess) return;
QTextStream out(stdout);
out << myProcess->readAllStandardOutput() << endl;
}
};
#endif // MATLABPROCESS
Because I want to do this stuff from qml, I registered this class in main.cpp
qmlRegisterType<MatlabProcess>("com.myself", 1, 0, "MatlabProcess");
From qml I call startMatlab() and than writeSomething(). The qt-output for "writesomething" will be
14
than 30seconds will happen nothing and program freezes than following lines will be printed in Qt-output
false
"result: "
The Notepad-text-area stays empty.