Question

I wrote some program in C++ Builder 6 (don’t ask me why).
I do some actions with on-form components after formResize event occurs.
But it occurs right after I close my program, and looks like all components on form where deleted, so I’ve got exception and everything crashes.
There is my code:

void __fastcall TForm3::FormResize(TObject *Sender)
{
    Image1->Picture->Graphic->Width = Image1->Width;
    Image1->Picture->Graphic->Height = Image1->Height;    
}

What can I do with that?

Answer 1

You could check to make sure the objects haven’t been deleted:

void __fastcall TForm3::FormResize(TObject *Sender)
{
    if (Image1) {
        Image1->Picture->Graphic->Width = Image1->Width;
        Image1->Picture->Graphic->Height = Image1->Height; 
    }   
}

But that assumes you always set pointers back to NULL when you delete them.

UPDATE:

Or you could do this:

void __fastcall TForm3::FormResize(TObject *Sender)
{
    if (this->Visible) {
        Image1->Picture->Graphic->Width = Image1->Width;
        Image1->Picture->Graphic->Height = Image1->Height;
    } 
}