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#include <QtGui/QApplication>
#include "mainwindow.h"
#include "mainy.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    mainy *mn = new mainy(&a);

    return a.exec();
}

#ifndef MAINY_H
#define MAINY_H

#include <QObject>
#include <QDebug>

class mainy : public QObject
{
    Q_OBJECT
public:
    explicit mainy(QObject *parent = 0);
    ~mainy();

public slots:
};

#endif // MAINY_H

#include "mainy.h"

mainy::mainy(QObject *parent) :
    QObject(parent)
{
}

mainy::~mainy() {
    //

    qDebug() << "DESTROYED";
}

mainy *mn = new mainy(&w);

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    Mainy *May = new Mainy(this);
}

class Mainy : public QObject
{
    Q_OBJECT
public:
    explicit Mainy(QObject *parent = 0);
    ~Mainy();

signals:

public slots:

};

// .h - file
void myMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg);

// .cpp - file
void myMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    QFile outFile(QCoreApplication::applicationDirPath()+"\\"+QCoreApplication::applicationName()+".log");
    outFile.open(QIODevice::WriteOnly | QIODevice::Append);
    QTextStream ts(&outFile);
    ts << QDateTime::currentDateTime().toString("dd/MM/yyyy (HH:mm:ss) : ") << msg << endl;
    if (type == QtFatalMsg) abort();
}

// in main() { }

qInstallMessageHandler(myMessageHandler);
w.show();
return a.exec();