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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.Imaging;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.IO;
using System.Windows.Media.Imaging;
using AForge;
using AForge.Controls;
using AForge.Video;
using AForge.Video.DirectShow;
using Size = System.Drawing.Size;
using System.Configuration;
using System.Drawing;
using System.Drawing.Drawing2D;


namespace OperateCamera
{
    public partial class Form1 : Form
    {
        private FilterInfoCollection videoDevices;
        private VideoCaptureDevice videoSource;
        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)
                {
                    tscbxCameras.Items.Add(device.Name);
                }

                tscbxCameras.SelectedIndex = 0;

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

        private void btnConnect_Click(object sender, EventArgs e)
        {
            CameraConn();

        }
        //连接摄像头
        private void CameraConn()
        {

            videoSourcePlayer.SignalToStop();
            videoSourcePlayer.WaitForStop();
            VideoCaptureDevice videoSource = new VideoCaptureDevice(videoDevices[tscbxCameras.SelectedIndex].MonikerString);
            videoSource.DesiredFrameSize = new System.Drawing.Size(1280, 1024);
            videoSource.DesiredFrameRate = 1;

            videoSourcePlayer.VideoSource = videoSource;
            videoSourcePlayer.Start();
        }

        //关闭摄像头
        private void btnClose_Click(object sender, EventArgs e)
        {
            videoSourcePlayer.SignalToStop();
            videoSourcePlayer.WaitForStop();
        }

        //主窗体关闭
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            btnClose_Click(null, null);
        }

        //拍照
        private void Photograph_Click(object sender, EventArgs e)
        {
            try
            {
                if (videoSourcePlayer.IsRunning)
                {


                    BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
                                    videoSourcePlayer.GetCurrentVideoFrame().GetHbitmap(),
                                    IntPtr.Zero,
                                    Int32Rect.Empty,
                                    BitmapSizeOptions.FromEmptyOptions());//
                    PngBitmapEncoder pE = new PngBitmapEncoder();
                    BitmapFrame bitmap = BitmapFrame.Create(bitmapSource);
                    pE.Frames.Add(bitmap);
                    string fileName = DateTime.Now.ToString("yyyyMMddHHmmss")   "_1";
                    string fileSaveName = DateTime.Now.ToString("yyyyMMddHHmmss");
                    string picName = GetImagePath()   "\\"   fileName   ".jpg";
                    string saveName = GetImagePath()   "\\"   fileSaveName   ".jpg";
                    if (File.Exists(picName))
                    {
                        File.Delete(picName);
                    }
                    using (Stream stream = File.Create(picName))
                    {
                        pE.Save(stream); 
                        
                    }
                    //拍照完成后关摄像头并刷新同时关窗体
                    //if (videoSourcePlayer != null && videoSourcePlayer.IsRunning)
                    //{
                    //    videoSourcePlayer.SignalToStop();
                    //    videoSourcePlayer.WaitForStop();
                    //} 
                   GetThumbnail(picName, saveName, 1920, 1080);
                     
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("摄像头异常："   ex.Message);
            }
        }


        //文件存储路径
        private string GetImagePath()
        {
            AppSettingsReader reader = new AppSettingsReader();
            string strServer = reader.GetValue("ServerPath", typeof(string)).ToString();


            //string personImgPath = Path.GetDirectoryName(AppDomain.CurrentDomain.BaseDirectory)
            //               Path.DirectorySeparatorChar.ToString()   "PersonImg";
            string personImgPath = "\\\\"   strServer   "\\upload";
            if (!Directory.Exists(personImgPath))
            {
                Directory.CreateDirectory(personImgPath);
            }

            return personImgPath;
        }
        /// <summary>  
        /// 生成缩略图  
        /// </summary>  
        /// <param name="serverImagePath">图片地址</param>  
        /// <param name="thumbnailImagePath">缩略图地址</param>  
        /// <param name="width">图片宽度</param>  
        /// <param name="height">图片高度</param>  
        /// <param name="p"></param>  
        public static bool GetThumbnail(string serverImagePath, string thumbnailImagePath, int width, int height)
        {

            System.Drawing.Image serverImage = System.Drawing.Image.FromFile(serverImagePath);
            //画板大小  
            int towidth = width;
            int toheight = height;
            //缩略图矩形框的像素点  
            int x = 0;
            int y = 0;
            int ow = serverImage.Width;
            int oh = serverImage.Height;
            if (ow > oh)
            {
                toheight = serverImage.Height * width / serverImage.Width;
            }
            else
            {
                towidth = serverImage.Width * height / serverImage.Height;
            }
            //新建一个bmp图片  
            System.Drawing.Image bm = new System.Drawing.Bitmap(width, height);
            //新建一个画板  
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bm);
            //设置高质量插值法  
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            //设置高质量,低速度呈现平滑程度  
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //清空画布并以透明背景色填充  
            g.Clear(System.Drawing.Color.White);
            //在指定位置并且按指定大小绘制原图片的指定部分  
            g.DrawImage(serverImage, new System.Drawing.Rectangle((width - towidth) / 2, (height - toheight) / 2, towidth, toheight),
                0, 0, ow, oh, System.Drawing.GraphicsUnit.Pixel);
            try
            {
                //以jpg格式保存缩略图  
                bm.Save(thumbnailImagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
                serverImage.Dispose();
                bm.Dispose();
                g.Dispose();
                //删除原图
                File.Delete(serverImagePath);
                return true;
            }
            catch (System.Exception e)
            {
                return false;
                throw e;
            }
            finally
            {
                serverImage.Dispose();
                bm.Dispose();
                g.Dispose();
            }
        }


//        /// <summary> 
//        /// 从视频中截取图片，调用GetNewImage方法，自定义图片大小，返回Bitmap格式图片
//        /// </summary> 
//        /// <returns></returns> 
//        private Bitmap GetImage()
//        {
//          Bitmap bitmap;
//            try
//            {
//                CameraForm.SendMessage(this.hHwnd, 0x41e, 0, 0);
//                System.Windows.IDataObject obj1 = System.Windows.Clipboard.GetDataObject();
//                if (obj1.GetDataPresent(typeof(Bitmap)))
//                {
//                    bitmap= (Bitmap)obj1.GetData(typeof(Bitmap));
//                    GetNewImage(bitmap, 300, 300);//自定图片大小
//                }

//}
//            catch
//            {

//}
//      return bitmap;
//        }

//        /// <summary> 
//        /// 对图片进行处理,返回一个Image类别的对象 
//        /// </summary> 
//        /// <param name="oldImgPath">原图片路径</param> 
//        /// <param name="newWidth">新图片宽度</param> 
//        /// <param name="newHeight">新图片高度</param> 
//        /// <returns></returns> 
//        private Image GetNewImage(Bitmap bmap, int newWidth, int newHeight)
//        {
//            Image oldImg = bmap;
//            Image newImg = oldImg.GetThumbnailImage(newWidth, newHeight, new Image.GetThumbnailImageAbort(IsTrue), IntPtr.Zero); // 对原图片进行缩放 
//            return newImg;
//        }
    } 
}