C# 使用AForge调用摄像头

AForge官网

安装AForge

Visual Studio 2022=>项目=>管理NuGet程序包，搜索AForge并依次安装作者为AForge.NET的多个关联组件。

使用AForge控件

安装AForge组件完成后，工具箱会新增AForge控件，将VideoSourcePlayer拖拽到Form控件区域即可。

1. 定义变量
   private FilterInfoCollection filterInfoCollection; // 摄像头设备集合
   private VideoCaptureDevice videoCaptureDevice; // 捕获设备源
   Bitmap bmp; // 处理图片
2. 获取PC端所有摄像头集合
   filterInfoCollection = new FilterInfoCollection(FilterCategory.VideoInputDevice);
3. 设置视频源并启动
   videoCaptureDevice = new VideoCaptureDevice(filterInfoCollection[0].MonikerString);
   videoSourcePlayer1.VideoSource = videoCaptureDevice;
   videoSourcePlayer1.Start();
4. 获取一帧摄像头数据
   bmp = videoSourcePlayer1.GetCurrentVideoFrame(); // 拍照
5. 关闭视频源
   if (videoSourcePlayer1.VideoSource != null)
   {
   videoSourcePlayer1.SignalToStop();
   videoSourcePlayer1.WaitForStop();
   videoSourcePlayer1.VideoSource = null;
   }

示例代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

using AForge;
using AForge.Controls;
using AForge.Video;
using AForge.Video.DirectShow;

namespace CameraDemo
{
    public partial class Form1 : Form
    {
        private FilterInfoCollection filterInfoCollection; // 摄像头设备集合
        private VideoCaptureDevice videoCaptureDevice;  // 捕获设备源
        Bitmap bmp; // 处理图片

        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            // 检测PC端所有摄像头
            filterInfoCollection = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            MessageBox.Show("识别到:" + filterInfoCollection.Count.ToString() +"个摄像头");

            comboBox1.Items.Add(filterInfoCollection[0].MonikerString);
        }

        private void CloseCamera()
        {
            if (videoSourcePlayer1.VideoSource != null)
            { 
                videoSourcePlayer1.SignalToStop();
                videoSourcePlayer1.WaitForStop();
                videoSourcePlayer1.VideoSource = null;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                TimeSpan now = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
                long t = Convert.ToInt64(now.TotalMilliseconds)/1000;
                bmp.Save(string.Format(@"D:\{0}.jpg", t.ToString()));
                MessageBox.Show("保存成功");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }            
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            CloseCamera();

            if (comboBox1.SelectedIndex == 0 && filterInfoCollection.Count > 0)
            {
                videoCaptureDevice = new VideoCaptureDevice(filterInfoCollection[0].MonikerString);
            }
            else if (comboBox1.SelectedIndex == 1 && filterInfoCollection.Count > 1)
            {
                videoCaptureDevice = new VideoCaptureDevice(filterInfoCollection[1].MonikerString);
            }
            else {
                MessageBox.Show("摄像头选择有误");
                return;
            }

            videoSourcePlayer1.VideoSource = videoCaptureDevice;
            videoSourcePlayer1.Start();

            button1.Enabled = true;
            button2.Enabled = true;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            CloseCamera();
        }

        /// 

        /// 拍照
        /// 
        /// 
        /// 
        private void button1_Click(object sender, EventArgs e)
        {
            bmp = videoSourcePlayer1.GetCurrentVideoFrame(); // 拍照
            pictureBox1.Image = bmp;            
        }
    }
}

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