[Qt-interest] Does QGLWidget have to be manually released?

[Joe Liu]

Hi guys,

I am writing some OpenGL programs based on QGLWidget;

My program now is quite simple, its structure is generally like this:

===========================================================
*// my Qt gl widget class*
class *MyGLWidget *: public QGLWidget
{
    MyGLWidget ();
    ~MyGLWidget ();    // do nothing

    // add some additional variables to manipulate the camera
};

*// my main window class*
class *MyWindow *: public QMainWindow
{
    MyWindow(QWidget* parent);
    ~QMainWindow();

    MyGLWidget* m_pGLWindow;
}

*// how the GL widget is created and attached to the main window*
MyWindow::MyWindow(QWidget* parent)
: QMainWindow(parent)
{
    ui.setupUi(this);

    *// set current main window as the parent of the gl widget***
    m_pGLWindow = new MyGLWidget (this);   **
    ui.glLayout->addWidget(m_pGLWindow);
}
==================================================================

At the beginning, everything works well; the GLWidget display a simple quad
in the scene;

However, when i tried to add more variables to help manipulate the camera
states,
The program always crashed when closing the application window;

the compiler outputs the message: Heap block at 013AB9C8 modified at
013ABAE4 past requested size of 114

Anyway, I tried to fix the problem by releasing QGLWidget object manually,
in this way:

==================================================================
MyWindow::~MyWIndow()
{
    m_pGLWindow->~MyGLWidget();  *// manually invoke the destructor of GL
widget*

*    // delete m_pGLWindow;  does not work*
}
==================================================================

Then the program shut down correctly.

So does Qt GL widget have to be manually released? It's very weird...

My Qt: v4.5.2,
OS: Windows XP sp3
Compiler: VC++ 9.0

Need some help, thanks~~

Cheers,


Joe
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