Programm crashes when QTcpServer is called - c++

Question

I'm trying a very, very simple QT networking program. For some reason it crashes when executing without any error message, since it's not printing out any of the outputs to the command line as expected. Here's the code:
qtTCPservertest.pro
QT += core
QT += network
QT -= gui
TARGET = qtTCPservertest
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp \
theserver.cpp
HEADERS += \
theserver.h
theServer.h
#ifndef THESERVER_H
#define THESERVER_H
#include <QTcpServer>
#include <stdio.h>
class theServer : public QTcpServer{
Q_OBJECT
public:
theServer();
~theServer();
void goOnline();
};
#endif // THESERVER_H
theServer.cpp
#include "theserver.h"
theServer::theServer()
{
}
theServer::~theServer()
{
}
void theServer::goOnline()
{
bool status = false;
unsigned int portNum = 5200;
status = this->listen(QHostAddress::Any, portNum );
// Check, if the server did start correctly or not
if( status == true )
printf("Server up\n");
else
printf("Server down\n");
}
and the main.cpp
#include <QCoreApplication>
#include <stdio.h>
#include "theserver.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
printf("Test\n");
theServer* aServer = new theServer();
aServer->goOnline();
aServer->~theServer();
return a.exec();
}
Has anyone an idea, where I went wrong? Since there is no error I'm total clueless. It just doesn't print out anything, it just tells me to hit any key to close the window, as if it came to an end as usual.
Thanks for any advise.

Answer 1

Here is the code that compiles and works for me (Qt 5.5):
TheServer.h
#ifndef THESERVER_H
#define THESERVER_H
#include <QTcpServer>
class TheServer : public QTcpServer
{
Q_OBJECT
public:
TheServer(QObject *pParent = nullptr);
void goOnline();
};
#endif // THESERVER_H
TheServer.cpp
#include <QDebug>
#include "TheServer.h"
TheServer::TheServer(QObject *pParent)
: QTcpServer(pParent)
{
}
void TheServer::goOnline()
{
bool status = listen(QHostAddress::Any, 5200);
if (status) {
qDebug() << "Server up";
} else {
qDebug() << "Server down";
}
}
main.cpp
#include <QCoreApplication>
#include "TheServer.h"
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
TheServer server;
server.goOnline();
return a.exec();
}