I Have a Classs Called MyDevice I Want To Create Direct3D9 Device but wher i Debug The Project The Pc Show A Message

Say :

Unhandled exception at 0x004114b7 in Direct3d Device.exe: 0xC0000005: Access violation reading location 0x00000000.

I  Use Viusal C++ 2005 Pro

The Code Is

void MyDevice::BuildDeviceParameters()
{
    
    ZeroMemory ( &Parameters , sizeof (D3DPRESENT_PARAMETERS));

    Direct3D->GetAdapterDisplayMode ( D3DADAPTER_DEFAULT , &DisplayMode );
    

    Parameters.AutoDepthStencilFormat = DisplayMode.Format ;
    Parameters.BackBufferCount = 3 ;
    Parameters.BackBufferFormat = DisplayMode.Format ;
    Parameters.BackBufferHeight = DisplayMode.Height ;
    Parameters.BackBufferWidth = DisplayMode.Width ;
    Parameters.EnableAutoDepthStencil = TRUE ;
    Parameters.hDeviceWindow = hwnd ;
    Parameters.SwapEffect = D3DSWAPEFFECT_DISCARD ;
    Parameters.Windowed = TRUE ;


    
}

remark

There Is No Error Whene I Build The Project 

your idea  works

 But

The error Go To The Reder Function please help §§§!!!!

Code:

 void MyDevice::Render()
{
    
    Device->Clear ( 0 , NULL , D3DCLEAR_TARGET , D3DCOLOR_XRGB(0,0,255) , 1.0f , 0);

    if ( SUCCEEDED ( Device->BeginScene ()))
    {
        Device->EndScene ();
    }
    Device->Present ( NULL , NULL , NULL , NULL );
    
}

One thing it could be, looking at your D3DPRESENT_PARAMETERS you're requesting a depth-stencil surface but you haven't specified its format, try setting its AutoDepthStencilFormat to something like D3DFMT_D16 or D3DFMT_D24X8. Or since you're just clearing the target you can set EnableAutoDepthStencil to FALSE.

Those access violations are to do with uninitialised pointers. Basically something like:

struct C { int i; }

C* ptr = 0;
ptr->i = 3;           // Access violation, ptr points to 0x0

you first need to set the pointer like:

C* ptr = new C;
ptr->i = 3;           // OK, we're pointing to something

Make sure that IDirect3D9 and IDirect3DDevice9 are created before you call any of their methods. Also make sure that you've created the window and called ShowWindow() and UpdateWindow() before you create the IDirect3DDevice9.

Now It Work

Very Thanks