my window disappears quickly

[Abeer]

Hi everyone..

I have problem in my project..
look at this first:
in dialog3.cpp

void Dialog3::openD4()
{
      drawGraph g;
    g.show();
}

void Dialog3::openD4()
{
      drawGraph g;
    g.show();
}

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I have drawGraph.h , drawGraph.cpp ,and drawGraph.ui files
( I draw circles and add bottons inside it)
I call them window by define object and call show functon to display it after dialog3..

but it disappears quickly
so, I cann't see it!

when I call it in main.cpp,it doesn't disappear!!

anyone have idea about that?

[Zlatomir]

That happens because you allocate memory (for your g) on that function stack.

You should allocate memory on the heap, so the object remains after the function terminates, like this:

drawGraph *g = new drawGraph; //create a pointer and allocate with new
g->show(); // use  -> to access members

drawGraph *g = new drawGraph; //create a pointer and allocate with new
g->show(); // use  -> to access members

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And make sure that your g pointer gets a parent, or else you should call delete g; in the class destructor (so that you wont get a memory leak)

[Abeer]

That happens because you allocate memory (for your g) on that function stack.

You should allocate memory on the heap, so the object remains after the function terminates, like this:

drawGraph *g = new drawGraph; //create a pointer and allocate with new
g->show(); // use  -> to access members

drawGraph *g = new drawGraph; //create a pointer and allocate with new
g->show(); // use  -> to access members

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And make sure that your g pointer gets a parent, or else you should call delete g; in the class destructor (so that you wont get a memory leak)

Thanks a lot
Thanks a lot Zlatomir

I see my window now clearly

I am grateful to you for helping..
thanks again..

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