class NativeHost : HwndHost
{
    new public IntPtr Handle
    {
        get { return (IntPtr)GetValue(HandleProperty); }
        set { SetValue(HandleProperty, value); }
    }
    // Using a DependencyProperty as the backing store for Hwnd.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty HandleProperty =
        DependencyProperty.Register("Handle", typeof(IntPtr), typeof(NativeHost), new PropertyMetadata(IntPtr.Zero));
    protected override HandleRef BuildWindowCore(HandleRef hwndParent)
    {
        Handle = CreateWindowEx(
            0, "static", "",
            WS_CHILD | WS_VISIBLE | LBS_NOTIFY,
            0, 0,
            (int)Width, (int)Height,
            hwndParent.Handle,
            IntPtr.Zero,
            IntPtr.Zero,
            0);
        return new HandleRef(this, Handle);
    }
    protected override void DestroyWindowCore(HandleRef hwnd)
    {
        DestroyWindow(hwnd.Handle);
    }
    const int WS_CHILD = 0x40000000;
    const int WS_VISIBLE = 0x10000000;
    const int LBS_NOTIFY = 0x001;
    [DllImport("user32.dll")]
    internal static extern IntPtr CreateWindowEx(int exStyle, string className, string windowName, int style, int x, int y, int width, int height, IntPtr hwndParent, IntPtr hMenu, IntPtr hInstance, [MarshalAs(UnmanagedType.AsAny)] object pvParam);
    [DllImport("user32.dll")]
    static extern bool DestroyWindow(IntPtr hwnd);
}

HwndSource版本：

class NativeHost : HwndHost
{
    new public IntPtr Handle
    {
        get { return (IntPtr)GetValue(HandleProperty); }
        set { SetValue(HandleProperty, value); }
    }
    // Using a DependencyProperty as the backing store for Hwnd.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty HandleProperty =
        DependencyProperty.Register("Handle", typeof(IntPtr), typeof(NativeHost), new PropertyMetadata(IntPtr.Zero));
    HwndSource _source;
    protected override HandleRef BuildWindowCore(HandleRef hwndParent)
    {
        _source = new HwndSource(0, WS_CHILD | WS_VISIBLE | LBS_NOTIFY, 0,0,0, (int)Width, (int)Height, "nativeHost", hwndParent.Handle);
        Handle = _source.Handle;
        return new HandleRef(this,Handle);
    }
    protected override void DestroyWindowCore(HandleRef hwnd)
    {
        _source.Dispose();
    }
    const int WS_CHILD = 0x40000000;
    const int WS_VISIBLE = 0x10000000;
    const int LBS_NOTIFY = 0x001;
}

二、使用方式

直接在xaml中使用上述實現(xiàn)的控件：

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        xmlns:local="clr-namespace:WpfApp1" xmlns:interop="clr-namespace:System.Windows.Interop;assembly=PresentationFramework"
        mc:Ignorable="d"
        Title="MainWindow" Height="440" Width="640"   
        >
    <Grid>
          <!--控件有個Handle屬性，可以綁定，使用OneWaytoSource賦值給viewModel-->
        <local:NativeHost x:Name="NH_Plane" Height="360" Width="640" ></local:NativeHost>
    </Grid>
</Window>

在Loaded事件中才能獲取到句柄，在此事件之前句柄還沒有生成。

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    //獲取控件句柄
    var hwnd=NH_Plane.Handle
    //通過句柄進(jìn)行渲染
}

三、示例

示例代碼：
https://download.csdn.net/download/u013113678/40304426
注：示例代碼與文本所有代碼基本一致，渲染部分在c++的dll不可見，請根據(jù)需要下載。
效果預(yù)覽：

在這里插入圖片描述

總結(jié)

通過HwndHost渲染視頻，本質(zhì)是獲取Hwnd渲染視頻，獲取Hwnd后渲染方式可以有多種選擇，用gdi、d3d、opengl都可以，其實就是相當(dāng)于在MFC上渲染視頻，很多方案有可以通用。但這種方法也有一些缺點，其渲染和wpf控件有沖突，無法同時存在，即視頻上面無法放置任何控件、也無法做到圓角播放框。

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