Exception thrown in SurfaceImageSource.as()

Question

I'm back to C++ after a 31-year absence and have spent the last few months learning everything I can about Windows app development, UWP, C++/WinRT, DirectX, WinUI 3, XAML, etc. All within Visual Studio 2022 Community.

I'm currently working on creating an app template that brings together DirectX and WinUI 3, allowing me to draw on a surface within XAML/UI3. So far I've been able to create separate apps with each component (modifying existing Microsoft templates), but I'm struggling a bit bringing them all together.

The closest example I've found (using C++/WinRT) is the "DirectX and XAML interop" tutorial. I copied the example into my WinUI 3 project and it compiles no errors and the UI runs fine until I click on the button that invokes the tutorial code. Then it crashes trying to create a winrt::com_ptr to the SurfaceImageSource. I've spent a couple of days now trying to figure out why. The code in question is :

(C++/WinRT)

    SurfaceImageSource  surfaceImageSource( 500, 500 ) ;
    
    winrt :: com_ptr <::ISurfaceImageSourceNativeWithD2D> sisNativeWithD2D { 
                    surfaceImageSource.as <::ISurfaceImageSourceNativeWithD2D> () } ;

If I replace "surfaceImageSource.as" with "surfaceImageSource.try_as" the call returns, but .get() on the com_ptr returns nullptr. So it looks like internally, QueryInterface is not succeeding.

Any help with this would be greatly appreciated since I don't know where to go from here. Thanks.

*** EDIT *** : additional information added per IInspectable's comment

Thanks IInspectable for your help. I can reproduce this with the following minimal setup :

1 - Create a new project from "Blank App, Packaged (WinUI 3 in Desktop)" C++/WinRT template. This project creates a blank window with a UI3 "Click Me" button in its center.

2 - In the file "MainWindow.xaml.cpp" :

a - at the top, add :

#include <windows.ui.xaml.media.dxinterop.h>

#include <winrt/Microsoft.UI.Xaml.Media.Imaging.h>

using namespace winrt::Microsoft::UI::Xaml::Media::Imaging;

b - further down, in the method "MainWindow::myButton_Click()" add the two lines mentioned earlier :

SurfaceImageSource  surfaceImageSource(500, 500);

winrt::com_ptr <::ISurfaceImageSourceNativeWithD2D> sisNativeWithD2D{
                surfaceImageSource.as <::ISurfaceImageSourceNativeWithD2D>() };

3 - that's it. Rebuild and the program crashes on the button click.

I put a breakpoint between the two lines above. I then put another breakpoint in "Generated Files\winrt\base.h" on first line of "struct IUnknown :: as()":

template <typename To>
auto as() const
{ (breakpoint here)

    return impl::as<To>(m_ptr);
}

When I continue execution, the program crashes immediately before returning to the next line of myButton_Click() (as far as I can determine).

Debug Output

'My_WinUI_3_project_4.exe' (Win32): Loaded 'C:\Program Files\WindowsApps\Microsoft.WindowsAppRuntime.1.1_1004.584.2120.0_x64__8wekyb3d8bbwe\Microsoft.DirectManipulation.dll'. 
onecoreuap\windows\frameworkudk\dxprivatescommon.cpp(53)\Microsoft.Internal.FrameworkUdk.dll!00007FFFABE09BC5: (caller: 00007FFFABE5ED0D) ReturnHr(1) tid(2508) 80004002 This interface is not supported
onecoreuap\windows\frameworkudk\dxprivatescommon.cpp(53)\Microsoft.Internal.FrameworkUdk.dll!00007FFFABE09BC5: (caller: 00007FFFABE5ED0D) ReturnHr(2) tid(2508) 80004002 This interface is not supported
onecoreuap\windows\frameworkudk\dxprivatescommon.cpp(53)\Microsoft.Internal.FrameworkUdk.dll!00007FFFABE09BC5: (caller: 00007FFFABE5ED0D) ReturnHr(3) tid(3670) 80004002 This interface is not supported
'My_WinUI_3_project_4.exe' (Win32): Loaded 'C:\Windows\System32\cabinet.dll'. 
'My_WinUI_3_project_4.exe' (Win32): Loaded 'C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\CommonExtensions\Microsoft\XamlDiagnostics\x64\WinUI3\Microsoft.VisualStudio.DesignTools.WinUITap.dll'. 
Microsoft.UI.Xaml.dll!00007FFF8DAF3D45: (caller: 00007FFF90651CAF) ReturnHr(1) tid(2508) 80070057 Incorrect parameter.
Microsoft.UI.Xaml.dll!00007FFF8DAF3D45: (caller: 00007FFF90651CAF) ReturnHr(2) tid(2508) 80070057 Incorrect parameter.
Microsoft.UI.Xaml.dll!00007FFF8DAF3D45: (caller: 00007FFF90651CAF) ReturnHr(3) tid(2508) 80070057 Incorrect parameter.
Exception thrown at 0x00007FF83C644FD9 (KernelBase.dll) in My_WinUI_3_project_4.exe: WinRT originate error - 0x80004002 : 'This interface is not supported'.
Exception thrown at 0x00007FF83C644FD9 in My_WinUI_3_project_4.exe: Microsoft C++ exception: winrt::hresult_no_interface at memory location 0x0000005C234FA538.
Exception thrown at 0x00007FF83C644FD9 in My_WinUI_3_project_4.exe: Microsoft C++ exception: [rethrow] at memory location 0x0000000000000000.
A breakpoint instruction (__debugbreak() statement or a similar call) was executed in My_WinUI_3_project_4.exe.

Call Stack

My_WinUI_3_project_4.exe!winrt::My_WinUI_3_project_4::implementation::App::{ctor}::__l2::<lambda>(const winrt::Windows::Foundation::IInspectable & __formal, const winrt::Microsoft::UI::Xaml::UnhandledExceptionEventArgs & e) Line 31 C++
My_WinUI_3_project_4.exe!winrt::impl::delegate<winrt::Microsoft::UI::Xaml::UnhandledExceptionEventHandler,void <lambda>(const winrt::Windows::Foundation::IInspectable &, const winrt::Microsoft::UI::Xaml::UnhandledExceptionEventArgs &)>::Invoke(void * sender, void * e) Line 4824  C++
[External Code] 
My_WinUI_3_project_4.exe!winrt::impl::consume_Microsoft_UI_Xaml_IApplicationStatics<winrt::Microsoft::UI::Xaml::IApplicationStatics>::Start(const winrt::Microsoft::UI::Xaml::ApplicationInitializationCallback & callback) Line 157    C++
My_WinUI_3_project_4.exe!winrt::Microsoft::UI::Xaml::Application::Start::__l2::<lambda>(const winrt::Microsoft::UI::Xaml::IApplicationStatics & f) Line 12146   C++
My_WinUI_3_project_4.exe!winrt::impl::factory_cache_entry<winrt::Microsoft::UI::Xaml::Application,winrt::Microsoft::UI::Xaml::IApplicationStatics>::call<void <lambda>(const winrt::Microsoft::UI::Xaml::IApplicationStatics &) &>(winrt::Microsoft::UI::Xaml::Application::Start::__l2::void <lambda>(const winrt::Microsoft::UI::Xaml::IApplicationStatics &) & callback) Line 6286   C++
My_WinUI_3_project_4.exe!winrt::impl::call_factory<winrt::Microsoft::UI::Xaml::Application,winrt::Microsoft::UI::Xaml::IApplicationStatics,void <lambda>(const winrt::Microsoft::UI::Xaml::IApplicationStatics &)>(winrt::Microsoft::UI::Xaml::Application::Start::__l2::void <lambda>(const winrt::Microsoft::UI::Xaml::IApplicationStatics &) && callback) Line 6309  C++
My_WinUI_3_project_4.exe!winrt::Microsoft::UI::Xaml::Application::Start(const winrt::Microsoft::UI::Xaml::ApplicationInitializationCallback & callback) Line 12147  C++
[External Code] 

Answer 1

This:

#include <windows.ui.xaml.media.dxinterop.h>

should be this:

#include <microsoft.ui.xaml.media.dxinterop.h>

when working with WinUI 3.0 Desktop apps and not UWP.