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This article mainly shows you "how wpf in C# renders video through HwndHost", which is easy to understand and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to render video through HwndHost in wpf in C#".

First, how to realize

By inheriting HwndHost and implementing abstract methods, you can use it in xaml as a wpf control with a handle, as follows:

Win32Api version:

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 = 0x100000000; 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 version:

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, (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 = 0x100000000; const int LBS_NOTIFY = 0x001;} II. Usage

Use the controls implemented above directly in xaml:

The handle is only obtained in the Loaded event, which has not been generated before this event.

Private void Window_Loaded (object sender, RoutedEventArgs e) {/ / get control handle var hwnd=NH_Plane.Handle / / render via handle} 3. Example

Sample code:

Https://download.csdn.net/download/u013113678/40304426

Note: the sample code is basically the same as all the code in the text. The rendering part is not visible in the dll of C++. Please download it as needed.

Effect Preview:

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