C++ (Cpp) IWICBitmapDecoder_QueryInterface示例

示例#1

文件： pngformat.c 项目： DeltaYang/wine

HRESULT PngDecoder_CreateInstance(REFIID iid, void** ppv)
{
    PngDecoder *This;
    HRESULT ret;

    TRACE("(%s,%p)\n", debugstr_guid(iid), ppv);

    *ppv = NULL;

    if (!libpng_handle && !load_libpng())
    {
        ERR("Failed reading PNG because unable to find %s\n",SONAME_LIBPNG);
        return E_FAIL;
    }

    This = HeapAlloc(GetProcessHeap(), 0, sizeof(PngDecoder));
    if (!This) return E_OUTOFMEMORY;

    This->IWICBitmapDecoder_iface.lpVtbl = &PngDecoder_Vtbl;
    This->IWICBitmapFrameDecode_iface.lpVtbl = &PngDecoder_FrameVtbl;
    This->IWICMetadataBlockReader_iface.lpVtbl = &PngDecoder_BlockVtbl;
    This->ref = 1;
    This->png_ptr = NULL;
    This->info_ptr = NULL;
    This->end_info = NULL;
    This->initialized = FALSE;
    This->image_bits = NULL;
    InitializeCriticalSection(&This->lock);
    This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": PngDecoder.lock");

    ret = IWICBitmapDecoder_QueryInterface(&This->IWICBitmapDecoder_iface, iid, ppv);
    IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);

    return ret;
}

示例#2

文件： jpegformat.c 项目： RPG-7/reactos

HRESULT JpegDecoder_CreateInstance(REFIID iid, void** ppv)
{
    JpegDecoder *This;
    HRESULT ret;

    TRACE("(%s,%p)\n", debugstr_guid(iid), ppv);

    if (!libjpeg_handle && !load_libjpeg())
    {
        ERR("Failed reading JPEG because unable to find %s\n", SONAME_LIBJPEG);
        return E_FAIL;
    }

    *ppv = NULL;

    This = HeapAlloc(GetProcessHeap(), 0, sizeof(JpegDecoder));
    if (!This) return E_OUTOFMEMORY;

    This->IWICBitmapDecoder_iface.lpVtbl = &JpegDecoder_Vtbl;
    This->IWICBitmapFrameDecode_iface.lpVtbl = &JpegDecoder_Frame_Vtbl;
    This->ref = 1;
    This->initialized = FALSE;
    This->cinfo_initialized = FALSE;
    This->stream = NULL;
    This->image_data = NULL;
    InitializeCriticalSection(&This->lock);
    This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": JpegDecoder.lock");

    ret = IWICBitmapDecoder_QueryInterface(&This->IWICBitmapDecoder_iface, iid, ppv);
    IWICBitmapDecoder_Release(&This->IWICBitmapDecoder_iface);

    return ret;
}