Question

My scenario is as follows (VC++ code):

IDirect3DSurface9 ***ppp;
IDirect3DSurface9* p;

I call CreateOffscreenPlainSurface( , , ,&p,null) and now p will hold the address of D3D surface. So I want to assign p to ppp.

So I am doing

(*(*ppp)) = p;

But it’s throwing the runtime exception. I don’t understand why. Can anyone kindly help me in this?

Answer 1

This assignment throws an exception because you are writing to an address pointed to by an uninitialized pointer. You need to allocate memory for the pointer to a pointer array and then to the pointer array before you can make an assignment.

ppp = new IDirect3DSurface9**[10];  // Pick the right size here
ppp[0] = new IDirect3DSurface9*[5]; // Pick the right size here, too
ppp[0][0] = p;

After you are done with these arrays, don’t forget to delete[] them.

If using pointers to pointers to pointers is not an explicit requirement, consider using std::vector<std::vector<IDirect3DSurface9*> > instead.