CreateBitmapFromWicBitmap access violation - visual-studio-2010

Question

Here's my problem:
I'm working on a test project, that initializes Direct2D to draw some stuff.
For now, I am in need of creating BMP background so I looked some tutorials of loading bmp to use it with Direct2D on MSDN site. After some coding and debugging I came to the only problem I can't fully comprehend and, well, I'm stuck here. The problem is simple: I get ACCESS VIOLATION at this line:
pRenderTarget->CreateBitmapFromWicBitmap( pConverter, NULL, ppBitmap);
I fixed all issues I could find out and tested every HRESULT.
here's full code of background.cpp:
`
#include "Background.h"
using namespace D2D1;
Background::Background()
{
pIWICFactory = nullptr;
pDecoder = nullptr;
pSource = nullptr;
pStream = nullptr;
pConverter = nullptr;
ppBitmap = nullptr;
destinationWidth = 0;
destinationHeight = 0;
file_path = L"Background.bmp";
}
bool Background::init(HWND hwnd)
{
CoInitializeEx(0, COINIT_MULTITHREADED);
CoCreateInstance( CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pIWICFactory));
pIWICFactory->CreateDecoderFromFilename(file_path, NULL, GENERIC_READ, WICDecodeMetadataCacheOnLoad, &pDecoder);
pIWICFactory->CreateStream(&pStream);
pStream->InitializeFromFilename(file_path, GENERIC_READ);
pDecoder->Initialize(pStream,WICDecodeMetadataCacheOnLoad);
pDecoder->GetFrame(0, &pSource);
pIWICFactory->CreateFormatConverter(&pConverter);
pConverter->Initialize(pSource, GUID_WICPixelFormat32bppPBGRA, WICBitmapDitherTypeNone, NULL, 0.f, WICBitmapPaletteTypeMedianCut);
pRenderTarget->CreateBitmapFromWicBitmap( pConverter, NULL, ppBitmap);
return true;
}
Background::~Background()
{
CoUninitialize();
pIWICFactory->Release();
pDecoder->Release();
pSource->Release();
pStream->Release();
pConverter->Release();
CoUninitialize();
}
`
And here's parent class "Render.cpp"
(there's no connection between how I managed class inheritance and the problem - I tried to create new project that contained only one class including both render and background)
`
#include "Render.h"
using namespace D2D1;
Render::Render()
{
pD2DFactory = nullptr;
pRenderTarget = nullptr;
pGreenBrush = nullptr;
}
bool Render::Init(HWND hwnd)
{
HRESULT hr = D2D1CreateFactory( D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory );
RECT rc;
GetClientRect(hwnd, &rc);
hr = pD2DFactory->CreateHwndRenderTarget(RenderTargetProperties(), HwndRenderTargetProperties(hwnd, SizeU( rc.right - rc.left, rc.bottom - rc.top)),&pRenderTarget);
if (SUCCEEDED(hr))
pRenderTarget->CreateSolidColorBrush(ColorF(ColorF::Green), &pGreenBrush );
else
return false;
return true;
}
bool Render::Draw(HWND hwnd)
{
RECT rc;
GetClientRect(hwnd, &rc);
pRenderTarget->BeginDraw();
pRenderTarget->FillRectangle(
RectF(
rc.left + 500.0f,
rc.top + 250.0f,
rc.right - 500.0f,
rc.bottom - 500.0f),
pGreenBrush);
HRESULT hr = pRenderTarget->EndDraw();
if (SUCCEEDED(hr))
return true;
else
return false;
}
void Render::ShutDown()
{
if (pD2DFactory)
pD2DFactory->Release();
if (pRenderTarget)
pRenderTarget->Release();
if (pGreenBrush)
pGreenBrush->Release();
}
`

Answer 1

From the double 'pp' I asume you declared ppBitmap; as D2D1Bitmap**, also because you pass it as-value to CreateBitmapFromWicBitmap.
If correct your solution is simple: Declare a ptrP*, not a ptrptrPP**
// in class declaration or c'tor(?)
D2D1Bitmap* pBitmap = nullptr; // instead of D2D1Bitmap**
/// at the point of creation
D2D1wndTarget->CreateBitmapFromWicBitmap(<yourConverter>, NULL, &pBitmap);
In your example you declared it as null-ptr and passed it to a function that takes an address to pointer, resulting in the function reading at 0x000000 resulting in an access violation.