directx programmering

er igang med at lære directx programmering
og har lavet et program der opretter directx, og skal animere en kat der løber. men er selv løbet ind i et problem.

får denne fejl ved runtime
Unhandled exception at 0x00411596 in Anim_Sprite.exe: 0xC0000005: Access violation reading location 0x00000000.

og den kommer i min init direct3d funktion
helt præcis når jeg når til
d3d->CreateDevice()

her er koden. nogle der kan hjælpe mig
ps. alle steder hvor der står ">" er faktisk en ">" men hjemmesiden laver det om af en grund

[code]
// Beginning game programming, second edition
// Chapter 7
// dxgraphics.cpp - Direct3D frameword source code file

#include <d3d9.h>
#include <d3dx9.h>
#include "dxgraphics.h"

// variable declarations
LPDIRECT3D9 d3d = NULL;
LPDIRECT3DDEVICE9 d3ddev = NULL;
LPDIRECT3DSURFACE9 backbuffer = NULL;

int Init_Direct3D(HWND hWnd, int width, int height, int fullscreen)
{
    // initialize the direct3D
    d3d = Direct3DCreate9(D3D_SDK_VERSION);
    if(d3d = NULL)
    {
        MessageBox(hWnd, "Error initializing Direct3D", "Error", MB_OK);
        return 0;
    }

    // set Direct3D presentation parameters
    D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory(&d3dpp, sizeof(d3dpp));

    d3dpp.Windowed = (!fullscreen);
    d3dpp.SwapEffect = D3DSWAPEFFECT_COPY;
    d3dpp.BackBufferFormat = D3DFMT_X8R8G8B8;
    d3dpp.BackBufferCount = 1;
    d3dpp.BackBufferWidth = width;
    d3dpp.BackBufferHeight = height;
    d3dpp.hDeviceWindow = hWnd;
    d3dpp.EnableAutoDepthStencil = TRUE;
    d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
    d3dpp.PresentationInterval    = D3DPRESENT_INTERVAL_IMMEDIATE;

    // create Direct3D device
    d3d->CreateDevice(
        D3DADAPTER_DEFAULT,
        D3DDEVTYPE_HAL,
        hWnd,
        D3DCREATE_SOFTWARE_VERTEXPROCESSING,
        &d3dpp,
        &d3ddev);


    if(d3ddev == NULL)
    {
        MessageBox(hWnd, "Error creating Direct3D device", "Error!", MB_OK);
        return 0;
    }

    // clear the backbuffer to black
    d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0);

    // create pointer to the backbuffer
    d3ddev->GetBackBuffer(0,0, D3DBACKBUFFER_TYPE_MONO, &backbuffer);

    return 1;
}

LPDIRECT3DSURFACE9 LoadSurface(char *filename, D3DCOLOR transcolor)
{
    LPDIRECT3DSURFACE9 image = NULL;
    D3DXIMAGE_INFO info;
    HRESULT result;

    // get width and height from bitmapfile
    result = D3DXGetImageInfoFromFile(filename, &info);
    if(result != D3D_OK)
        return NULL;

    // create surface
    result = d3ddev->CreateOffscreenPlainSurface(
        info.Width,            // width of surface
        info.Height,        // height of surface
        D3DFMT_X8R8G8B8,    // surface format
        D3DPOOL_DEFAULT,    // memory pool to use
        &#8465;,                // pointer to the surface
        NULL);                // reserved (always NULL

    if(result != D3D_OK)
        return NULL;

    // load surface from file into newly created surface
    result = D3DXLoadSurfaceFromFile(
        image,        // destinationsurface
        NULL,        // destination palette
        NULL,        // destination rectange
        filename,    // source filename
        NULL,        // source rectangle
        D3DX_DEFAULT, // controls how image is filtered
        transcolor,    // for transparency(90 for none
        NULL);        // source image info (usually NULL)

    // make sure the file was loaded ok
    if(result != D3D_OK)
        return NULL;
    return image;
}
[/code]