After running a program containing the Qaxwidget control for a period of time, there are records indicating that the interface becomes stuck. Monitoring the notify of QApplication, the receiver->objectName for mouse click events is empty

pyli

the mouse hover on splitter, the mouse icon will change。

Pl45m4

The objectName for dynamically created QObjects is always empty if you don't have set one before.

goldenhawking

Some control contains a stdio operation will stuck in a period time , when the printf function inside the control over-fill the stdout buf. Try to read the stdout buf with tunnels such like : app > log.txt. This is only a possibility, that will mostly not work.

IgKh

It is hard to decipher the question... What I understood is that the UI becomes unresponsive, and the mouse cursor does not change when you hover over the splitter control, right?

If so - it means that the main thread event loop has become blocked by something (in the application itself, or maybe in the ActiveX control). Next time it happens, attach a debugger to the application and force it to stop. Then look at the stack trace of the main thread (almost always the one whose stack trace begins with WinMain) to see what it is doing - that thing is either hanging or doing some intensive CPU work.

pyli

@Pl45m4 You're right, the name is not set, but the problem is not solved. Through Microsoft SPY++ monitoring, it was found that the VM_MouseMove/Down was gone, only VM_SetCursor. UI clicks are unresponsive

pyli

It's like Qaxwidget control stealing the focus of the application

hskoglund

Maybe you can steal back to the focus by muting the control, say by calling disableEventSink on it.

pyli

I tried this method, and the problem mainly occurred when switching tabs. The system event is as follows
abnormal: don't have WM_MOUSEMOVE and WM_MOUSEDOWN
![alt text](![abnormal.png]
normal: have WM_MOUSEMOVE and WM_MOUSEDOWN

pyli

this is my class inherits from QAxWidget.

class MyChildQaxWidget : public QAxWidget
{

public:
    MyChildQaxWidget ( QWidget * parent = 0 ) : QAxWidget (parent)
    {
        this->setFocusPolicy(Qt::ClickFocus);
        this->setAttribute(Qt::WA_ShowWithoutActivating);
        this->disableClassInfo();
        this->disableEventSink();

    }

    MyChildQaxWidget ( const QString & c, QWidget * parent = 0 ) : QAxWidget (c,parent)
    {}

protected:
    void mousePressEvent ( QMouseEvent * e ) override
    {
        setFocus();
        clearFocus();
        QAxWidget::mousePressEvent ( e );
    }
    void showEvent(QShowEvent* event) override
    { 
        return QAxWidget::showEvent(event);
    }

    void hideEvent(QHideEvent* event) override
    {
        this->clearFocus();
        return QAxWidget::hideEvent(event);
    }
};

pyli

This post is deleted!

hskoglund

What COM object are you hosting in your MyChildQaxWidget?
If it's something like Internet Explorer, you might be better off using Qt's WebEngine instead.

pyli

@hskoglund Don't is IE, it is provided by third-party companies. So I'm not sure about its underlying implementation, I'm just calling it

hskoglund

Ok,. To get smoother experience, have you tried running dumpcpp on that control?

That way you can get QAxObject subclasses specially suited for the control, and you don' have to write your own subclass like MyChildQaxWidget.