Do the Access Violations every end?

I've been working on a game engine for the past 2 weeks, I've run into some wierd errors throughout my time, but this one takes the pie. I've debugged it from start to finish, watching the addresses carefully. I noticed that the function that causes the error SETS an argument to 0x00000000 or NULL and that seems to be causing the access violation. I watched that argument all the way down to the function and it's definitely not NULL. Here's some code:

Error Function

Code:

---

BOOL ArkButton::Init(ArkCore *Ark, LPCTSTR TextureFilename, int MaxButtons)
{
        if( Ark == NULL || TextureFilename == NULL || MaxButtons == NULL )
                return FALSE;
        if( Ark->GetDevice() == NULL )
                return FALSE;

        *m_Button = new sButton[MaxButtons];

        if(FAILED(D3DXCreateTextureFromFile(Ark->GetDevice(), TextureFilename, &m_Texture)))  // ACCESS VIOLATION, ARK IS THE SUPPOSED NULL OBJECT(NOTE THE CHECK FOR IT)
                return FALSE;

---

And the call:

Code:

---

/* PRE INSTANTIATED OBJECTS **********
ArkCore* AC;
ArkButton* AB;
**********************************/

AB->Init(AC, "C:\\UI\\Buttons.jpg", 2); // The call

---

I'm stumped, any ideas?

:confused: I suspect you're setting a pointer to NULL, rather than setting whatever the pointer points-to to NULL.

Well what does Ark->GetDevice() return? I would assume a pointer to an IDirect3DDevice9.
Also why are you checking an int to be NULL?
I don't know much about D3D but are you sure you shouldn't be checking something like

Code:

---

if(Ark->GetDevice() == INVALID_DEVICE)
{
  //oh crap
}

---

My logic is based on this code

Code:

---

#include <iostream>

class Ark
{
  public:
    Ark()
    {
      device = new int;
    }
    int *GetDevice()
    {
      return device;
    }
  private:
    int *device;
};

int main()
{
  Ark *ark = new Ark;
  if(ark->GetDevice() == NULL)
  {
    std::cout<<"It's null"<<std::endl;
  }
  else
  {
    std::cout<<"It's ok"<<std::endl;
  }
  std::cin.get();
}

---

Even though it passes the NULL check it doesn't mean it is good data.

Arg, I was allocating memory for the dereferenced double pointer, but I wasn't allocating memory for the actual double pointer. So on dereference of the double pointer, it was actually pointing to NULL.

Solution:
m_Button = new sButton();
*m_Button = new sButton[];

Cool glad I was no help to you ;)