WPF實現(xiàn)調(diào)用本機攝像頭的示例代碼

更新時間：2022年08月03日 17:11:23 作者：驚鏵

這篇文章主要介紹了如何利用WPF實現(xiàn)調(diào)用本機攝像頭，文中的示例代碼講解詳細，對我們學習或工作有一定幫助，需要的可以參考一下

此項目使用了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(chuàng)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