前言：

AForge.NET 是用C#写的一个关于计算机视觉和人工智能领域的框架，它包括图像处理、神经网络、遗传算法和机器学习等。在C#程序中使用摄像头，我习惯性使用AForge.NET提供的类库。本文讲解如何在WPF程序中调用AForge.NET控件实现视频和抓拍功能。

AForge.NET控件下载地址：

WPF与WinForm控件交互：

要实现视频功能，需要使用AForge.Controls命名空间中的VideoSourcePlayer控件。这是一个WinForm控件，要在WPF程序中使用，我们需要做如下4步：

1. 添加引用：

   在.NET选项卡中选择WindowsFormsIntegration

   在浏览选项卡中添加3个AForge.NET类库

   AForge.Controls.dll

   AForge.Video.dll

   AForge.Video.DirectShow.dll

2. 在XAML中添加System.Windows.Forms.Integration命名空间

   [html]

   1. xmlns:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"

   xmlns:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"

3. 在XAML中添加AForge.Controls命名空间

   [html]

   1. xmlns:aforge ="clr-namespace:AForge.Controls;assembly=AForge.Controls"

   xmlns:aforge ="clr-namespace:AForge.Controls;assembly=AForge.Controls"

4. 在XAML中加入VideoSourcePlayer可视控件

   [html]

   1. <wfi:WindowsFormsHost Grid.Row="0" Margin="5">
   2. <aforge:VideoSourcePlayer x:Name="sourcePlayer" Width="300" Height="360">
   3. </aforge:VideoSourcePlayer>
   4. </wfi:WindowsFormsHost>

演示程序界面：

开发工具：

• Visual Studio v2010

• .NET Framework 4 Client Profile

工程文件下载：

源程序：

MainWindow.xaml

xmlns:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"

xmlns:aforge ="clr-namespace:AForge.Controls;assembly=AForge.Controls"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:my="clr-namespace:Splash;assembly=FingerPictureBox"

Title="FaceCapture（WPF）" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="480" d:DesignWidth="902" SizeToContent="WidthAndHeight" WindowStartupLocation="CenterScreen" ResizeMode="CanMinimize" AllowDrop="True" Closing="Window_Closing">

MainWindow.xaml.cs

using System;

using System.Windows;

using System.Windows.Media.Imaging;

using AForge.Video.DirectShow;

using Splash;

namespace FaceCapture

{

/// 

/// MainWindow.xaml 的交互逻辑

/// 

public partial class MainWindow : Window

{

BitmapSource ImagePlay;

BitmapSource ImageStop;

public MainWindow()

{

InitializeComponent();

// 设置窗体图标

this.Icon = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(

Properties.Resources.FingerPictureBox.Handle,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

// 图像源初始化

ImagePlay = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

Properties.Resources.Button_Play_icon2.GetHbitmap(),

IntPtr.Zero,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

ImageStop = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

Properties.Resources.Button_Stop_icon.GetHbitmap(),

IntPtr.Zero,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

// 设置按钮图像

image_Play.Source = ImagePlay;

image_Capture.Source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

Properties.Resources.capture.GetHbitmap(),

IntPtr.Zero,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

// 设置窗体装载后事件处理器

this.Loaded += new RoutedEventHandler(MainWindow_Loaded);

}

private void MainWindow_Loaded(object sender, RoutedEventArgs e)

{

// 设定初始视频设备

FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

if (videoDevices.Count > 0)

{   // 默认设备

sourcePlayer.VideoSource = new VideoCaptureDevice(videoDevices[0].MonikerString);

}

else

{

button_Play.IsEnabled = false;

button_Capture.IsEnabled = false;

}

// 设置图片框初始图像

BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

Properties.Resources.noimage.GetHbitmap(),

IntPtr.Zero,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

fingerPictureBox1.InitialImage = bs;

fingerPictureBox2.InitialImage = bs;

fingerPictureBox3.InitialImage = bs;

fingerPictureBox4.InitialImage = bs;

}

private void button_Play_Click(object sender, RoutedEventArgs e)

{

if (image_Play.Source == ImagePlay)

{   // 开启视频

sourcePlayer.Start();

if (sourcePlayer.IsRunning)

{

// 改变按钮为“停止”状态

image_Play.Source = ImageStop;

label_Play.Content = "停止";

// 允许拍照

button_Capture.IsEnabled = true;

}

}

else

{

if (sourcePlayer.IsRunning)

{   // 停止视频

sourcePlayer.SignalToStop();

sourcePlayer.WaitForStop();

// 改变按钮为“开始”状态

image_Play.Source = ImagePlay;

label_Play.Content = "开启摄像头"; ;

// 关闭拍照

button_Capture.IsEnabled = false;

}

}

}

private void button_Capture_Click(object sender, RoutedEventArgs e)

{

// 判断视频设备是否开启

if (sourcePlayer.IsRunning)

{   // 进行拍照

for (Int32 i = 1; i <= 4; i++)

{

object box = this.FindName("fingerPictureBox" + i);

if(box is FingerPictureBox)

{

if ((box as FingerPictureBox).ActiveImage == (box as FingerPictureBox).InitialImage)

{   // 更新图像

(box as FingerPictureBox).ActiveImage = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

sourcePlayer.GetCurrentVideoFrame().GetHbitmap(),

IntPtr.Zero,

Int32Rect.Empty,

BitmapSizeOptions.FromEmptyOptions());

break;

}

}

}

}

}

private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)

{

if (sourcePlayer.IsRunning)

{   // 停止视频

sourcePlayer.SignalToStop();

sourcePlayer.WaitForStop();

}

}

}

}