WPF实现调用本机摄像头的示例代码

此项目使用了OpenCVSharp加载本地摄像头,多个摄像头支持切换展示,也可以展示rtsp地址。

使用NuGet如下:

代码如下

一、创建MainWindow.xaml代码如下。

 <ws:Window x:Class="OpenCVSharpExample.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:ws="https://github.com/WPFDevelopersOrg.WPFDevelopers.Minimal"         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"         xmlns:local="clr-namespace:OpenCVSharpExample"         Icon="OpenCV_Logo.webp"         mc:Ignorable="d" WindowStartupLocation="CenterScreen"         Title="OpenCVSharpExample https://github.com/WPFDevelopersOrg" Height="450" Width="800">     <Grid>         <Grid.RowDefinitions>             <RowDefinition Height="Auto"/>             <RowDefinition />             <RowDefinition Height="Auto"/>         </Grid.RowDefinitions>         <ComboBox Name="ComboBoxCamera" ItemsSource="{Binding CameraArray,RelativeSource={RelativeSource AncestorType=local:MainWindow}}"                    Width="200" SelectedIndex="{Binding CameraIndex,RelativeSource={RelativeSource AncestorType=local:MainWindow}}"                   SelectionChanged="ComboBoxCamera_SelectionChanged"/>         <Image Grid.Row="1" Name="imgViewport" Margin="0,4"/>         <StackPanel Orientation="Horizontal"                     HorizontalAlignment="Center"                     Grid.Row="2">             <!--<Button Name="btRecord" Click="btRecord_Click" Content="Record" Style="{StaticResource PrimaryButton}" Width="100" Height="50" Margin="16"/>-->             <Button Name="btStop" Click="btStop_Click" Content="Stop"  Width="100" Height="50" Margin="16"/>         </StackPanel>     </Grid> </ws:Window>

二、MainWindow.xaml.cs代码如下。

using OpenCvSharp; using OpenCvSharp.Extensions; using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Management; using System.Threading; using System.Windows; using System.Windows.Controls; using System.Windows.Media.Imaging; using System.Windows.Threading; namespace OpenCVSharpExample {     /// <summary>     /// MainWindow.xaml 的交互逻辑     /// </summary>     public partial class MainWindow     {         private VideoCapture capCamera;         private Mat matImage = new Mat();         private Thread cameraThread;         public List<string> CameraArray         {             get { return (List<string>)GetValue(CameraArrayProperty); }             set { SetValue(CameraArrayProperty, value); }         }         public static readonly DependencyProperty CameraArrayProperty =             DependencyProperty.Register("CameraArray", typeof(List<string>), typeof(MainWindow), new PropertyMetadata(null));         public int CameraIndex         {             get { return (int)GetValue(CameraIndexProperty); }             set { SetValue(CameraIndexProperty, value); }         }         public static readonly DependencyProperty CameraIndexProperty =             DependencyProperty.Register("CameraIndex", typeof(int), typeof(MainWindow), new PropertyMetadata(0));         public MainWindow()         {             InitializeComponent();             Width = SystemParameters.WorkArea.Width / 1.5;             Height = SystemParameters.WorkArea.Height / 1.5;             this.Loaded += MainWindow_Loaded;         }         private void MainWindow_Loaded(object sender, RoutedEventArgs e)         {             InitializeCamera();         }         private void ComboBoxCamera_SelectionChanged(object sender, SelectionChangedEventArgs e)         {             if (CameraArray.Count - 1 < CameraIndex)                 return;             if (capCamera != null && cameraThread != null)             {                 cameraThread.Abort();                 StopDispose();             }             capCamera = new VideoCapture(CameraIndex);             capCamera.Fps = 30;             CreateCamera();         }         private void InitializeCamera()         {             CameraArray = GetAllConnectedCameras();         }         List<string> GetAllConnectedCameras()         {             var cameraNames = new List<string>();             using (var searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity WHERE (PNPClass = 'Image' OR PNPClass = 'Camera')"))             {                 foreach (var device in searcher.Get())                 {                     cameraNames.Add(device["Caption"].ToString());                 }             }             return cameraNames;         }         void CreateCamera()         {             cameraThread = new Thread(PlayCamera);             cameraThread.Start();         }         private void PlayCamera()         {             while (capCamera != null && !capCamera.IsDisposed)             {                 capCamera.Read(matImage);                 if (matImage.Empty()) break;                 Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>                 {                     var converted = Convert(BitmapConverter.ToBitmap(matImage));                     imgViewport.Source = converted;                 }));             }         }         private void btStop_Click(object sender, RoutedEventArgs e)         {             StopDispose();             btStop.IsEnabled = false;         }         void StopDispose()         {             if (capCamera != null && capCamera.IsOpened())             {                 capCamera.Dispose();                 capCamera = null;             }         }         void CreateRecord()         {             cameraThread = new Thread(PlayCamera);             cameraThread.Start();         }         BitmapImage Convert(Bitmap src)         {             System.Drawing.Image img = src;             var now = DateTime.Now;             var g = Graphics.FromImage(img);             var brush = new SolidBrush(System.Drawing.Color.Red);             g.DrawString($"北京时间:{ now.ToString("yyyy年MM月dd日 HH:mm:ss")}", new System.Drawing.Font("Arial", 18), brush, new PointF(5, 5));             brush.Dispose();             g.Dispose();             MemoryStream ms = new MemoryStream();             img.Save(ms, ImageFormat.Bmp);             ms.Seek(0, SeekOrigin.Begin);             BitmapImage image = new BitmapImage();             image.BeginInit();             image.StreamSource = ms;             image.EndInit();             image.Freeze();             return image;         }         protected override void OnClosed(EventArgs e)         {             StopDispose();         }     } }

效果预览

源码地址如下

Github:https://github.com/WPFDevelopersOrg

https://github.com/WPFDevelopersOrg/OpenCVSharpExample

Gitee:https://gitee.com/WPFDevelopersOrg

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