Question

Program works fine (with random crashes) and Memory Validator reports Uninitialized read problem in pD3D = Direct3DCreate9.
What could be the problem ?

init3D.h

    class CD3DWindow
    {
            public:
                CD3DWindow();
                ~CD3DWindow();
                LPDIRECT3D9 pD3D;
                HRESULT PreInitD3D();
                HWND hWnd;  
                bool killed;
                VOID KillD3DWindow();
    };

init3D.cpp

    CD3DWindow::CD3DWindow()
    {
        pD3D=NULL; 
    }

    CD3DWindow::~CD3DWindow()
    {
        if (!killed) KillD3DWindow();
    }

    HRESULT CD3DWindow::PreInitD3D()
    {
        pD3D = Direct3DCreate9( D3D_SDK_VERSION );  // Here it reports a problem 
        if( pD3D == NULL )  return E_FAIL;
    // Other not related code

    VOID CD3DWindow::KillD3DWindow()
    {
        if (killed) return;
        diwrap::input.UnCreate();   
        if (hWnd) DestroyWindow(hWnd);
        UnregisterClass( "D3D Window", wc.hInstance );
        killed = true;
    }

Inside main app .h

    CD3DWindow *d3dWin;

Inside main app .cpp

    d3dWin = new CD3DWindow;
d3dWin->PreInitD3D();

And here is the error report:

 Error: UNINITIALIZED READ: reading register ebx
@0:00:02.969 in thread 4092

 0x7c912a1f <ntdll.dll+0x12a1f> ntdll.dll!RtlUnicodeToMultiByteN

0x7e42d4c4 <USER32.dll+0x1d4c4> USER32.dll!WCSToMBEx

0x7e428b79 <USER32.dll+0x18b79> USER32.dll!EnumDisplayDevicesA

0x4fdfc8c7 <d3d9.dll+0x2c8c7> d3d9.dll!DebugSetLevel

0x4fdfa701 <d3d9.dll+0x2a701> d3d9.dll!D3DPERF_GetStatus

0x4fdfafad <d3d9.dll+0x2afad> d3d9.dll!Direct3DCreate9

0x00644c59 <Temp.exe+0x244c59> Temp.exe!CD3DWindow::PreInitD3D
c:\_work\Temp\initd3d.cpp:32   

Answer 1

Edit: Your stack trace is very, very strange- inside the USER32.dll? That’s part of Windows.

What I might suggest is that you’re linking the multi-byte Direct3D against the Unicode D3D libraries, or something like that. You shouldn’t be able to cause Windows functions to trigger an error.