WPF 实现调用本机摄像头~

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接着很久前的上一篇

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：

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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.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();}}
}

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效果预览

鸣谢素材提供者 - 屈越