WPF中通过AForge实现USB摄像头拍照
转载：https://www.cnblogs.com/lingLuoChengMi/p/8466559.html
最近由于某种原因呢，需要做一下拍照的功能，本来我纠结到底用AForge类库还是用WPFMediaKit.dll ，不过后来看网上说WPFMediaKit.dll 是截图而AForge是直接通过摄像头拍照，于是乎，我就选择了AForge类库。
首先留下发帖时我所用的AForge(NuGet包管理器可下载) 链接：https://pan.baidu.com/s/1htmOjPi 密码：tovd
第一步
将AForge中的DLL添加进引用，然后添加引用System.Drawing，System.Windows.Forms，WindowsFormsIntegration
第二步
加上
xmlns:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
xmlns:aforge ="clr-namespace:AForge.Controls;assembly=AForge.Controls"
还有
<wfi:WindowsFormsHost Grid.Row="0" HorizontalAlignment="Left" Width="517" Height="320" VerticalAlignment="Top">
<aforge:VideoSourcePlayer x:Name="player" Height="480" Width="640"/>
</wfi:WindowsFormsHost>
下面贴详细代码
MainWindow.xaml
<Window x:Class="FaceOne.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:local="clr-namespace:FaceOne"
xmlns:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
xmlns:aforge ="clr-namespace:AForge.Controls;assembly=AForge.Controls"
mc:Ignorable="d"
Title="MainWindow" Height="600" Width="800" Loaded="Window_Loaded">
<Grid>
<wfi:WindowsFormsHost Grid.Row="0" HorizontalAlignment="Left" Width="517" Height="320" VerticalAlignment="Top">
<aforge:VideoSourcePlayer x:Name="player" Height="480" Width="640"/>
</wfi:WindowsFormsHost>
<Button x:Name="connectBtn" Content="连接" HorizontalAlignment="Left" Margin="53,439,0,0" VerticalAlignment="Top" Width="75" Click="connectBtn_Click"/>
<Button x:Name="captureBtn" Content="拍照" HorizontalAlignment="Left" Margin="180,439,0,0" VerticalAlignment="Top" Width="75" Click="captureBtn_Click"/>
<Button x:Name="closeBtn" Content="断开" HorizontalAlignment="Left" Margin="312,439,0,0" VerticalAlignment="Top" Width="75" Click="closeBtn_Click"/>
<Image x:Name="imageCapture" HorizontalAlignment="Left" Height="210" Margin="522,66,0,0" VerticalAlignment="Top" Width="239"/>
</Grid>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace FaceOne
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
MyCapture myCapture = MyCapture.Instance();
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
//myCapture.sourcePlayer = player;//配置好XAML后再加上这句，即可看到摄像头的视图
myCapture.getCamera();//获取摄像头
myCapture.saveOk += ImageSaveOk;//保存照片后触发
}
//连接
private void connectBtn_Click(object sender, RoutedEventArgs e)
{
myCapture.CameraConn();
}
//拍照
private void captureBtn_Click(object sender, RoutedEventArgs e)
{
myCapture.CaputreImage();
}
//断开
private void closeBtn_Click(object sender, RoutedEventArgs e)
{
myCapture.CloseDevice();
}
//保存照片后触发(想看预览就用，不想看就不需要了)
private void ImageSaveOk(string str)
{
/*//老套的赋值方式，不会释放内存
BitmapImage bit = new BitmapImage();
bit.BeginInit();
bit.UriSource = new Uri(AppDomain.CurrentDomain.BaseDirectory+str);
bit.EndInit();
imageCapture.Source = bit;*/
BitmapImage bmi = myCapture.InitImage(str);
imageCapture.Source = bmi;
}
}
}
MyCapture.cs
using AForge.Controls;
using AForge.Video.DirectShow;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media.Imaging;
namespace FaceOne
{
class MyCapture
{
public delegate void SaveOk(string str);
public SaveOk saveOk;
private static MyCapture instance;
public static MyCapture Instance()
{
if (instance == null)
{
instance = new MyCapture();
}
return instance;
}
//private static FilterInfoCollection _cameraDevices;
private FilterInfoCollection videoDevices;
//private static VideoCaptureDevice div = null;
VideoCaptureDevice videoSource;
public VideoSourcePlayer sourcePlayer = new VideoSourcePlayer();
public void getCamera()
{
// 获取电脑已经安装的视频设备
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
if (videoDevices != null && videoDevices.Count > 0)
{
foreach (FilterInfo device in videoDevices)
{
Console.WriteLine(device.Name);
}
//CameraConn();
}
}
//连接并且打开摄像头
public void CameraConn()
{
if (videoDevices.Count <= 0)
{
Console.WriteLine("请插入视频设备");
return;
}
videoSource= new VideoCaptureDevice(videoDevices[0].MonikerString);//连接到第一个设备，可灵活改动
//videoSource.DesiredFrameSize = new System.Drawing.Size(240, 320);
//videoSource.DesiredFrameRate = 1;
sourcePlayer.VideoSource = videoSource;
videoSource.Start();
sourcePlayer.Start();
}
//截取一帧图像并保存
public void CaputreImage(string filePath=null,string fileName=null)
{
if (sourcePlayer.VideoSource == null)
{
return;
}
//判断是否有这个目录，如果没有则新创建这个目录
/*if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}*/
try
{
Image bitmap = sourcePlayer.GetCurrentVideoFrame();
/*if (fileName == null)
{
fileName = DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss");
}*/
//string str = @"" + fileName + ".jpg";
string str = "asd.jpg";//使用InitImage可以重复读写一张图，不用的话，就只能一直保存新的图片了
bitmap.Save(str,ImageFormat.Jpeg); //想看预览就用，不想看就不需要了
bitmap.Dispose();
saveOk(str);
}
catch(Exception e)
{
Console.WriteLine(e.Message.ToString());
}
}
//关闭摄像头设备
public void CloseDevice()
{
if (videoSource != null && videoSource.IsRunning)
{
sourcePlayer.Stop();
videoSource.SignalToStop();
videoSource = null;
videoDevices = null;
}
}
//解决不同进程读取同一张图片的问题，使用流来读图片
public BitmapImage InitImage(string filePath)
{
BitmapImage bitmapImage;
using (BinaryReader reader = new BinaryReader(File.Open(filePath, FileMode.Open)))
{
FileInfo fi = new FileInfo(filePath);
byte[] bytes = reader.ReadBytes((int)fi.Length);
reader.Close();
//image = new Image();
bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = new MemoryStream(bytes);
bitmapImage.EndInit();
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
//image.Source = bitmapImage;
reader.Dispose();
}
return bitmapImage;
}
}
}
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