无法在Direct2D项目中初始化IWICImagingFactory

Question

i'm creating a direct2d project and i can't load a bitmap picture because the object of the class IWICImagingFactory is null. i don't know if i am calling correctly the function CoCreateInstance.

this is the code i am using for initialize everything:

// ... d2dFactory ... and others objects
IWICImagingFactory* pIWICFactory = 0;

HRESULT TDE_Device::Initialize(HWND hwnd)
{
    HRESULT hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &d2dFactory);
    //
    RECT rc;
    GetClientRect(hwnd, &rc);
    //
    D2D1_SIZE_U size = D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top);
    d2dFactory->CreateHwndRenderTarget(D2D1::RenderTargetProperties(),     D2D1::HwndRenderTargetProperties(hwnd, size), &MainD2DCore.d2dRenderTarg);
    wndHandle = hwnd;
    //
    // ----------  HERE IS THE CoCreateInstance ------------------------
    CoCreateInstance(CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_IWICImagingFactory, reinterpret_cast<void **>(&pIWICFactory));
    if (pIWICFactory == 0)
    {
        // I GET THIS MESSAGE
        MessageBox(NULL, L"Error creating the Image Factory", L"ERROR", MB_OK);
        return E_FAIL;
    }
    //
    return hr;
}

when i try to use this IWICImagingFactory for load a picture from file, i get the Access violation exception because is reading the address 0x0.

what the correct way to call the function CoCreateInstance?

Answer 1

Yes it is the correct way of creating an ImagingFactory but did you call CoInitializeEx( NULL, COINIT_MULTITHREADED); befor calling CoCreateInstance?