my window disappears quickly

Hi everyone..

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

Code:

---

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

---

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?

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:

Code:

---

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

---

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)

Quote:

---

Originally Posted by 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:

Code:

---

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

---

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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