Running Urho3D and Qt from main - c++

Question

I am using the Urho3D engine with Qt for an application. The problem is that both Urho3D and QApplication require to be ran from main(). For now I am using it in separate processes but IPC makes it complicated.
Is there any way to solve this issue? Thanks
My platform is Urho3D 1.5, Qt 4.71 and Windows 7 x64 and VS2015 (C++)

Answer 1

I'm new to both c++ and Urho3D, but I've successfully achieved it.
Simple code, haven't had further test:
awidget.h:
#ifndef AWIDGET_H
#define AWIDGET_H
#include <QWidget>
#include <QPushButton>
#include <Urho3D/Engine/Application.h>
class aWidget : public QWidget
{
Q_OBJECT
public:
explicit aWidget(QWidget *parent = 0)
{
QPushButton *button = new QPushButton(this);
connect(button, SIGNAL(clicked()), this, SLOT(pressed()));
}
public slots:
void pressed()
{
Urho3D::Context* context = new Urho3D::Context();
Urho3D::Application *application = new Urho3D::Application(context);
application->Run();
}
};
#endif // AWIDGET_H
main.cpp:
#include <QApplication>
#include <awidget.h>
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
aWidget *widget = new aWidget();
widget->show();
return app.exec();
}
By the way, I'm using Qt 5.9.0

Answer 2

So the answer is quite simple. Instead of running QApplication by calling
app->exec();
it is needed to manually and regularily call this from your main loop:
app->processEvents();
This will take care that all events used by Qt are processed and QApplication will respond accordingly.
Example:
#include <QApplication>
#include <awidget.h>
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
bool shallrun = true;
aWidget *widget = new aWidget();
widget->show();
while (shallrun)
{
app->processEvents();
...
}
...
}