WPF實現調用本機攝像頭的示例代碼
此項目使用瞭OpenCVSharp加載本地攝像頭,多個攝像頭支持切換展示,也可以展示rtsp地址。
使用NuGet如下:
代碼如下
一、創建MainWindow.xaml代碼如下。
<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.png" 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代碼如下。
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 的交互邏輯 /// </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($"北京時間:{ 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(); } } }
效果預覽
源碼地址如下
Github:https://github.com/WPFDevelopersOrg
https://github.com/WPFDevelopersOrg/OpenCVSharpExample
Gitee:https://gitee.com/WPFDevelopersOrg
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