Get Hwnd of swapchainpanel in UWP Application

vaishali sharma 21

I have a UWP App that uses a C++ API to render videos. The C++ API takes IntPtr of panel where we need to render the video as input. In Winforms, I can directly pass a panel's Handle where the video will be rendered. How can I do the same in UWP. I am thinking to use SwapChainPanel as a canvas to render video.

Roy Li - MSFT 32,721 Reputation points Microsoft Vendor

2021-10-13T05:53:18.17+00:00

In UWP apps, UI elements have no handle. I'd suggest you might try other APIs that doesn't require a handle to render videos.
vaishali sharma 21 Reputation points

2021-10-13T06:58:25.11+00:00

As the API we use is legend and have no other choice. I need to somehow manage to pass intptr of place where I need the video.
Is it ok to obtain ISwapChainPanelNative from my UWP SwapChainPanel using following approach.

This interface provides the native implementation of the Windows::UI::XAML::Control::SwapChainPanel Windows Runtime type. To obtain a pointer to ISwapChainPanelNative, you must cast a SwapChainPanel instance to IInspectable or IUnknown, and call

Microsoft::WRL::ComPtr<ISwapChainPanelNative> m_swapChainNative;
// ...
IInspectable* panelInspectable = (IInspectable*) reinterpret_cast<IInspectable*>(swapChainPanel);
panelInspectable->QueryInterface(__uuidof(ISwapChainPanelNative), (void **)&m_swapChainNative);

source: https://video2.skills-academy.com/en-us/windows/win32/api/windows.ui.xaml.media.dxinterop/nn-windows-ui-xaml-media-dxinterop-iswapchainpanelnative
Roy Li - MSFT 32,721 Reputation points Microsoft Vendor

2021-10-15T02:42:05.817+00:00

That's an interesting question. I'll consult other engineers about this. There might be some time delay.
AnnPeter 0 Reputation points

2024-05-30T18:09:51.2766667+00:00

it works?

1 answer

Castorix31 82,751 Reputation points

2021-10-12T10:32:38.597+00:00

You can see the sample SwapChainPanel DirectX interop sample
which uses a C++ D3DPanel class inherited from SwapChainPanel :
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vaishali sharma 21 Reputation points

2021-10-12T10:50:16.357+00:00

My use case is, I need to send IntPtr of my UI control, where an existing C++ component will do the rendering. I am struggling to fetch the intptr of UI element. I tried using AppWindow and ICoreWindow API to launch window and then set parent it. But the setparent hides my MainWindow UI Controllers.
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Get Hwnd of swapchainpanel in UWP Application

1 answer