LRESULT CALLBACK ChildProc(HWND hWnd, UINT uiMessage, WPARAM wParam, LPARAM lParam)
{

static BITMAPFILEHEADER *pbmfh;
static BITMAPINFO *pbmi;
static BYTE *pBits;
static int cxDib, cyDib;

switch (uiMessage)
   {
   case WM_CREATE:

      DWORD dwFileSize, dwHighSize, dwBytesRead;
      HANDLE hFile;

      hFile = CreateFile ("test.bmp", GENERIC_READ,
                          FILE_SHARE_READ, NULL,
                          OPEN_EXISTING,
                          FILE_FLAG_SEQUENTIAL_SCAN,
                          NULL);
      dwFileSize = GetFileSize (hFile, &dwHighSize);
      pbmfh = (BITMAPFILEHEADER *) malloc (dwFileSize);
      ReadFile (hFile, pbmfh, dwFileSize,
                &dwBytesRead, NULL);

      pbmi = (BITMAPINFO *) (pbmfh + 1);
      pBits = (BYTE *) pbmfh + pbmfh->bfOffBits;
      cxDib = pbmi->bmiHeader.biWidth;
      cyDib = abs(pbmi->bmiHeader.biHeight);
      HDC hdc;
      hdc = GetDC (hWnd);

      SetDIBitsToDevice (hdc, 0, 0,
                         cxDib, cyDib,
                         0,0,0, cyDib,
                         pBits,
                         pbmi,
                         DIB_RGB_COLORS);

      ReleaseDC (hWnd, hdc);
      free (pbmfh);
      return 0;

default:
return DefWindowProc(hWnd, uiMessage, wParam, lParam);

    }
   }

Das Ganze fuktioniert aber nicht, warum?