i am try to install on button

i am installing event filter after setupUi(..);

i am not getting window after run the program.
i am getting message like "The program has unexpectedly finished"
and " c:\Qt_practice\mouse_event.exe existed with code -1073741819".

Why this is any reason for it?
How can make it work for base class Qmainwindow.

Thank you
Venkat

i have added installEventFilter in constructor.?

Can we need to include any .h or any thing in .pro file
my code is:

In .h

bool eventFilter(QObject *object, QEvent *event);

in .cpp

mainwindow :: mainwindow(....)
{
button->installEventfilter(this);
}
bool mainwindow::eventFilter(QObject *object, QEvent *event)
{
if(event->type() == QEvent::MouseButtonPress)
{
label->settext("hello");
}
}
can you plz help me how work with event filter

[Action]
precondition value = Hello //if text on button is hello
[API]
objectId = button3
action = 3 /
Argumet = hello /// set text "hello" on button 3 ; we have set of function 3 equivalent to set text.

Ex: Event ID = button1
precondition = "read text on button2
Action = if precondition oK then write text on button3.

so all events, preconditions and Actions are configurable.
Each time will check event Id which is return from TRT_GETINPUT(..) with configuration events if both are matching then we check precondition and perform action.

so that why i need a function which return event info.

can you please help me.

Thank you
Regard
Venkat

You can have a look at "this":http://qt-project.org/doc/qt-5/eventsandfilters.html chapter from the documentation which explains the event system used by Qt.

There's an equivalent chapter for QML