这篇文章主要为大家展示了“C#中wpf如何通过HwndHost渲染视频”,内容简而易懂,条理清晰,希望能够帮助大家解决疑惑,下面让小编带领大家一起研究并学习一下“C#中wpf如何通过HwndHost渲染视频”这篇文章吧。
通过继承HwndHost并实现抽象方法即可作为一个带句柄的wpf控件在xaml中使用,代码如下:
win32Api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));
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;
}
直接在xaml中使用上述实现的控件:
<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>
<!--控件有个Handle属性,可以绑定,使用OneWaytoSource赋值给viewModel-->
<local:NativeHost x:Name="NH_Plane" Height="360" Width="640" ></local:NativeHost>
</Grid>
</Window>
在Loaded事件中才能获取到句柄,在此事件之前句柄还没有生成。
private void Window_Loaded(object sender, RoutedEventArgs e)
{
//获取控件句柄
var hwnd=NH_Plane.Handle
//通过句柄进行渲染
}
示例代码:
https://download.csdn.net/download/u013113678/40304426
注:示例代码与文本所有代码基本一致,渲染部分在c++的dll不可见,请根据需要下载。
效果预览:
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