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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using AForge.Video.DirectShow;
using System.IO;
using System.Drawing.Imaging;

namespace WinFromDrawing
{
    public partial class Form1 : Form
    {
        private FilterInfoCollection videoDevices;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                // 枚举所有视频输入设备
                videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

                if (videoDevices.Count == 0)
                    throw new ApplicationException();

                foreach (FilterInfo device in videoDevices)
                {
                    cmbCameras.Items.Add(device.Name);
                }

                cmbCameras.SelectedIndex = 0;
            }
            catch (ApplicationException)
            {
                cmbCameras.Items.Add("No local capture devices");
                videoDevices = null;
            }
        }

        //启动设备
        private void CameraConn()
        {
            VideoCaptureDevice videoSource = new VideoCaptureDevice(videoDevices[cmbCameras.SelectedIndex].MonikerString);
            videPlayer.VideoSource = videoSource;
            videPlayer.Start();
        }
        
        //启动
        private void btStart_Click(object sender, EventArgs e)
        {
            CameraConn();
        }

        //拍照
        private void btImage_Click(object sender, EventArgs e)
        {
            try
            {
                string filePath = @"F:\Temp\";
                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }
                Bitmap bitmap = videPlayer.GetCurrentVideoFrame();
                string fileName = "54250.jpg";
                bitmap.Save(filePath   fileName, ImageFormat.Jpeg);
                bitmap.Dispose();
            }
            catch (Exception ex)
            {
                MessageBox.Show("捕获图像失败！"   ex.Message, "提示");
            }
        }

        //断开
        private void btStop_Click(object sender, EventArgs e)
        {
            videPlayer.SignalToStop();
            videPlayer.WaitForStop();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            videPlayer.SignalToStop();
            videPlayer.WaitForStop();
        }

        private void cmbCameras_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}