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我的目标：将字符串从 C#/Xaml 编写的 Windows Phone 运行时组件传递到 C++ 编写的 Direct3DComponent。

我的理解：这是使用 D3DInterop 完成的。

更具体地说，我将 D3D 与 Xaml 应用程序模板一起使用，并尝试将值传递给加载 DrawingSurfaceGrid 时创建的 Direct3DBackground 对象。

模板作者通过仅复制诸如整数之类的琐碎数据类型来实现这一点，但没有给出封送字符串的示例。我得出的结论是，最终解决方案将比简单的变量分配更复杂，例如第一次调用首先分配一个足够大的缓冲区，然后再实际复制字节。

下面首先是项目的托管部分，它将数据传递给 D3DComponent，然后是接收数据的类 Direct3DBackground 类声明。

    private void DrawingSurfaceBackground_Loaded(object sender, RoutedEventArgs e)
    {
        if (m_d3dBackground == null)
        {
            m_d3dBackground = new Direct3DBackground();

            // Set window bounds in dips
            m_d3dBackground.WindowBounds = new Windows.Foundation.Size(
                (float)Application.Current.Host.Content.ActualWidth,
                (float)Application.Current.Host.Content.ActualHeight
                );

            // Set native resolution in pixels
            m_d3dBackground.NativeResolution = new Windows.Foundation.Size(
                (float)Math.Floor(Application.Current.Host.Content.ActualWidth * Application.Current.Host.Content.ScaleFactor / 100.0f + 0.5f),
                (float)Math.Floor(Application.Current.Host.Content.ActualHeight * Application.Current.Host.Content.ScaleFactor / 100.0f + 0.5f)
                );

            // Set render resolution to the full native resolution
            m_d3dBackground.RenderResolution = m_d3dBackground.NativeResolution;

            // Get the location of the model from the query string
            string ModelLocation;
            if (this.NavigationContext.QueryString.ContainsKey("ModelLocation"))
            {
                ModelLocation = this.NavigationContext.QueryString["ModelLocation"];
            }

            // then somehow pass the value of ModelLocation to m_d3dBackground
            /// ???

            // Hook-up native component to DrawingSurfaceBackgroundGrid
            DrawingSurfaceBackground.SetBackgroundContentProvider(m_d3dBackground.CreateContentProvider());
            DrawingSurfaceBackground.SetBackgroundManipulationHandler(m_d3dBackground);
        }
    }

以及接收此数据的 C++ 类：

public ref class Direct3DBackground sealed : public Windows::Phone::Input::Interop::IDrawingSurfaceManipulationHandler
{
public:
    Direct3DBackground();

    Windows::Phone::Graphics::Interop::IDrawingSurfaceBackgroundContentProvider^ CreateContentProvider();

    // IDrawingSurfaceManipulationHandler
    virtual void SetManipulationHost(Windows::Phone::Input::Interop::DrawingSurfaceManipulationHost^ manipulationHost);

    event RequestAdditionalFrameHandler^ RequestAdditionalFrame;

    property Windows::Foundation::Size WindowBounds;
    property Windows::Foundation::Size NativeResolution;
    property Windows::Foundation::Size RenderResolution;
    // property System::String ModelLocationUri; // The solution is more complex than this

protected:
    // Event Handlers
    void OnPointerPressed(Windows::Phone::Input::Interop::DrawingSurfaceManipulationHost^ sender, Windows::UI::Core::PointerEventArgs^ args);
    void OnPointerReleased(Windows::Phone::Input::Interop::DrawingSurfaceManipulationHost^ sender, Windows::UI::Core::PointerEventArgs^ args);
    void OnPointerMoved(Windows::Phone::Input::Interop::DrawingSurfaceManipulationHost^ sender, Windows::UI::Core::PointerEventArgs^ args);

internal:
    HRESULT Connect(_In_ IDrawingSurfaceRuntimeHostNative* host, _In_ ID3D11Device1* device);
    void Disconnect();

    HRESULT PrepareResources(_In_ const LARGE_INTEGER* presentTargetTime, _Inout_ DrawingSurfaceSizeF* desiredRenderTargetSize);
    HRESULT Draw(_In_ ID3D11Device1* device, _In_ ID3D11DeviceContext1* context, _In_ ID3D11RenderTargetView* renderTargetView);

private:
    CubeRenderer^ m_renderer;
    BasicTimer^ m_timer;
};
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1 回答 1

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这就是为什么你必须Platform.String传递字符串。将以下属性添加到 D3DInterop 类：

property Platform::String ^Name;

现在您可以像这样从 C# 代码中设置它：

m_d3dInterop.Name = "Whatever you like";
于 2013-04-08T15:55:18.297 回答