On 3 Oct 2012, at 21:08, Furqan wrote:
> What I am doing is, I am creating a box in fl_double window like this.
>
> V3DS_box = new Fl_Box(FL_DOWN_FRAME, 400, 10, w+10, h+10, "");
>
> but I need to execute the main subroutine several times without closing the
> fl_double window, if I close fl_double window then its ok. but without
> closing the window, I got an error, because every time fl_box creates on the
> same fl_double window. So, here I need to delete V3DS_box first in order to
> do the operation again. The issue is how can delete the box. I tried like
> this,
>
> if(V3DS_box) free(V3DS_box);
> V3DS_box = new Fl_Box(FL_DOWN_FRAME, 400, 10, w+10, h+10, "");
>
> in debug mode, it gives no error but in release mode, the system goes to not
> responding and crashed. So, what is the solution of delete fltk allocations ?
> how can i delete first and recreate this box. ?
What are you trying to do? I don't understand why you are creating a new box
every time...
If the box is created as a child of the Fl_Window, then when the window is
deleted, the box will be deleted. But you are not deleting the window... or the
box... So, why do you recreate the box on each iteration?
There must be something I am not understanding here.
Anyway, to address your question:
You have created the box using the C++ "new" operator. Therefore, you should
delete it by calling the C++ "delete" operator, NOT by calling "free". The
"free" operation is appropriate for items allocated using C-style mallocs for
example, but NOT for C++ "new" allocations.
So, your code wants to say:
if(V3DS_box)
{
delete V3DS_box;
V3DS_box = NULL;
}
Or, simply do not recreate it if it already exists:
if(V3DS_box)
{
// do nothing as we already have the box
}
else
{
V3DS_box = new Fl_Box(FL_DOWN_FRAME, 400, 10, w+10, h+10, "");
}
Either way ought to work.
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