本人C#菜鸟一枚，很多东西不懂，网上资料也不是很多，怕自己忘掉或找不到资料，在此做下记录，以备后面使用，也可以帮助其他需要的伙伴们
C#一般使用AForge调用摄像头进行拍照，AForge比较完善，经过很多人的检验和完善，现在不论是功能还是稳定性上，都能满足我们基本需要，我们这里也是用这个类库进行的，主要用了它的摄像头初始化，预览和拍照几个功能，如果您有兴趣可以多多挖掘它的功能并分享出来，下面是效果图，不过我本文的代码时一个摄像头的，需要多路的请自行修改代码即可，温馨提示，多路修改很简单哦，废话补多说，开整
首先需要您导入AForge依赖，需要下载并放到bin目录下，自行百度就可以下载到，但是网上的资料不是很全，我将库打包上传了，您也可以通过此链接下载库
https://download.csdn.net/download/baoolong/85580501接下来我们先需要写下布局文件，布局文件中靠VideoPlayer显示摄像头的信息，3个Button分别用来开启摄像头，关闭摄像头和拍照的，布局文件较简单，可以根据需要自行更改布局
<Window x:Class="CameraCapture.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:wfi ="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
xmlns:aforge ="clr-namespace:AForge.Controls;assembly=AForge.Controls"
xmlns:local="clr-namespace:CameraCapture"
mc:Ignorable="d"
Title="MainWindow" Height="610" Width="640">
<StackPanel>
<wfi:WindowsFormsHost Grid.Row="0" Grid.Column="0">
<aforge:VideoSourcePlayer x:Name="player" Height="90" Width="106"/>
</wfi:WindowsFormsHost>
<Button Name="btnCapture" Click="btnCapture_Click" Height="30">拍照</Button>
<Button Name="btnOpenCamera" Click="btnOpenCamera_Click" Height="30">打开</Button>
<Button Name="btnCloseCamera" Click="btnCloseCamera_Click" Height="30">关闭</Button>
</StackPanel>
</Window>
我们写完布局文件还要写一个摄像头控制的类 CameraHelper.cs
里面查询摄像头数量，给VideoPlayer设置摄像头，拍照，关闭摄像头等方法全都有，您只需要调用对应的方法即可，我自己试过，可以稳定运行，您可以放心的拷贝复制啦
class CameraHelper
{
private static FilterInfoCollection _cameraDevices;
private VideoCaptureDevice div = null;
private VideoSourcePlayer sourcePlayer = new VideoSourcePlayer();
private bool _isDisplay = false;
//指示_isDisplay设置为true后，是否设置了其他的sourcePlayer，若未设置则_isDisplay重设为false
private bool isSet = false;
/// <summary>
/// 获取或设置摄像头设备，无设备为null
/// </summary>
public static FilterInfoCollection CameraDevices
{
get
{
return _cameraDevices;
}
set
{
_cameraDevices = value;
}
}
/// <summary>
/// 指示是否显示摄像头视频画面
/// 默认false
/// </summary>
public bool IsDisplay
{
get { return _isDisplay; }
set { _isDisplay = value; }
}
/// <summary>
/// 获取或设置VideoSourcePlayer控件，
/// 只有当IsDisplay设置为true时，该属性才可以设置成功
/// </summary>
public VideoSourcePlayer SourcePlayer
{
get { return sourcePlayer; }
set
{
if (_isDisplay)
{
sourcePlayer = value;
isSet = true;
}
}
}
/// <summary>
/// 更新摄像头设备信息
/// </summary>
public static void UpdateCameraDevices()
{
_cameraDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
}
/// <summary>
/// 设置使用的摄像头设备
/// </summary>
/// <param name="index">设备在CameraDevices中的索引</param>
/// <returns><see cref="bool"/></returns>
public bool SetCameraDevice(int index)
{
if (!isSet) _isDisplay = false;
//无设备，返回false
if (_cameraDevices.Count <= 0 || index < 0) return false;
if (index > _cameraDevices.Count - 1) return false;
// 设定初始视频设备
div = new VideoCaptureDevice(_cameraDevices[index].MonikerString);
sourcePlayer.VideoSource = div;
div.Start();
sourcePlayer.Start();
return true;
}
/// <summary>
/// 截取一帧图像并保存
/// </summary>
/// <param name="filePath">图像保存路径</param>
/// <param name="fileName">保存的图像文件名</param>
/// <returns>如果保存成功，则返回完整路径，否则为 null</returns>
public string CaptureImage(string filePath, string fileName = null)
{
if (sourcePlayer.VideoSource == null) return null;
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 fullPath = Path.Combine(filePath, fileName + "-cap.jpg");
bitmap.Save(fullPath, ImageFormat.Jpeg);
bitmap.Dispose();
return fullPath;
}
catch (Exception e)
{
MessageBox.Show(e.Message.ToString());
return null;
}
}
/// <summary>
/// 关闭摄像头设备
/// </summary>
public void CloseDevice()
{
if (div != null && div.IsRunning)
{
sourcePlayer.Stop();
div.SignalToStop();
div = null;
_cameraDevices = null;
}
}
}下来我们看看主界面是怎么做的，首先初始化摄像头Helper类并设置显示的Player，然后更新摄像头，三个点击事件，一个用来打开摄像头，一个关闭摄像头，还有拍照的，都是调用Helper类进行的，我还设置了一个预览帧调用的方法 videoSourcePlayer1_NewFrame，每当有新的帧时，就可以通过对图像进行处理，方法都很简单的，如果您需要开发多路的摄像头，仅仅需要修改布局和这个类就可以，我现在里面时单个摄像头的
public partial class MainWindow : Window
{
private CameraHelper cameraHelper = new CameraHelper();
public MainWindow()
{
InitializeComponent();
cameraHelper.IsDisplay = true;
cameraHelper.SourcePlayer = player;
cameraHelper.UpdateCameraDevices();
}
private void btnCapture_Click(object sender, RoutedEventArgs e)
{
string fullPath = cameraHelper.CaptureImage(AppDomain.CurrentDomain.BaseDirectory + @"\Capture");
BitmapImage bit = new BitmapImage();
bit.BeginInit();
bit.UriSource = new Uri(fullPath);
bit.EndInit();
String result = parseBarCode(bit);
Console.WriteLine("------"+ result);
}
private void btnOpenCamera_Click(object sender, RoutedEventArgs e)
{
if (cameraHelper.CameraDevices.Count > 0)
{
cameraHelper.SetCameraDevice(0);
player.NewFrame += videoSourcePlayer1_NewFrame;
}
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
cameraHelper.CloseDevice();
}
private Result[] parseBarCode(Bitmap bit)
{
BarcodeReader reader = new BarcodeReader();
reader.Options.CharacterSet = "UTF-8";
Result[] results = null;
try
{
results = reader.DecodeMultiple(bit);
}
catch (Exception e)
{
String msg = e.Message;
Console.WriteLine(msg);
}
return results;
}
private String parseBarCode(BitmapImage bit)
{
BarcodeReader reader = new BarcodeReader();
reader.Options.CharacterSet = "UTF-8";
Result result = null;
try
{
result = reader.Decode(bit);
}
catch (Exception e)
{
String msg = e.Message;
Console.WriteLine(msg);
}
return result == null ? "" : result.Text;
}
private void videoSourcePlayer1_NewFrame(object sender, ref Bitmap image)
{
if (image == null) return;
Bitmap bitmap = (Bitmap)image.Clone();
new Thread(()=> {
Result[] res = parseBarCode(bitmap);
if (res == null) return;
foreach (Result result in res)
{
String resStr = result == null ? "" : result.Text;
Console.WriteLine("------" + resStr);
}
}).Start();
}
private void btnCloseCamera_Click(object sender, RoutedEventArgs e)
{
player.NewFrame -= videoSourcePlayer1_NewFrame;
player.SignalToStop();
player.WaitForStop();
}
}现在你就可以开开心心的用摄像头拍照了，如果您觉得本文章有用，还请您点个赞