using System;

using System.Collections.Generic;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Runtime.InteropServices;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.Windows.Threading;

using WPFMediaKit.DirectShow.Controls;

using ZXing;

using ZXing.Common;

using ZXing.QrCode.Internal;

namespace QRcode

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        /// <summary>

        /// ZXING 二维码扫描类

        /// </summary>

        BarcodeReader codeReader = new BarcodeReader();

        /// <summary>

        /// 定时器

        /// </summary>

        DispatcherTimer cameraTimer = new DispatcherTimer();

        public MainWindow()

        {

            InitializeComponent();

            // 配置的摄像头名称

            var camera = "Lenovo EasyCamera";

            if (MultimediaUtil.VideoInputNames.Contains(camera))

            {

                //控件制定摄像头

                vce.VideoCaptureSource = camera;

                cameraTimer.IsEnabled = false;

                cameraTimer.Interval = new TimeSpan(200); //执行间隔0.2秒

                cameraTimer.Tick += cameraTimer_Tick;

            }

        }

        /// <summary>

        /// 计时器方法

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void cameraTimer_Tick(object sender, EventArgs e)

        {

            RenderTargetBitmap bmp = new RenderTargetBitmap((int)vce.ActualWidth, (int)vce.ActualHeight, 96, 96, PixelFormats.Default);

            vce.Measure(vce.RenderSize);

            vce.Arrange(new Rect(vce.RenderSize));

            bmp.Render(vce);

            BitmapEncoder encoder = new JpegBitmapEncoder();

            encoder.Frames.Add(BitmapFrame.Create(bmp));

            using (MemoryStream ms = new MemoryStream())

            {

                encoder.Save(ms);

                Bitmap btiMap = new Bitmap(ms);

                var result = codeReader.Decode(btiMap);//解析条码

                if (result != null)

                {

                    // 1:停止识别

                    cameraTimer.Stop();

                    vce.Play();

                    MessageBox.Show($"识别内容为：{result}");

                }

            }

        }

        private void BtnShiBie_Click(object sender, RoutedEventArgs e)

        {

            cameraTimer.Start();

        }

        private void BtnShnegCeng_Click(object sender, RoutedEventArgs e)

        {

           var codimg= Create("hello world!!");

            imgQR.Source = ChangeBitmapToImageSource(codimg);

        }

        /// <summary>

        /// 创建二维码

        /// </summary>

        /// <param name="msg">二维码中保存的信息</param>

        /// <returns></returns>

        public static Bitmap Create(string msg)

        {

            MultiFormatWriter writer = new MultiFormatWriter();

            Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();

            //设置二维码为utf-8编码

            hint.Add(EncodeHintType.CHARACTER_SET, "utf-8");

            //设置纠错等级， 高

            hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

            BitMatrix bm = writer.encode(msg, BarcodeFormat.QR_CODE, 200, 120, hint);

            BarcodeWriter barcodeWriter = new BarcodeWriter();

            Bitmap bitmap = barcodeWriter.Write(bm);

            string codePath = Directory.GetCurrentDirectory() + "/code.jpg";

            if (File.Exists(codePath))

                File.Delete(codePath);

            bitmap.Save(codePath);

            return bitmap;

        }

        /// <summary>

        /// 从bitmap转换成ImageSource

        /// </summary>

        /// <param name="icon"></param>

        /// <returns></returns>

        public static ImageSource ChangeBitmapToImageSource(Bitmap bitmap)

        {

            IntPtr hBitmap = bitmap.GetHbitmap();

            ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(

                hBitmap,

                IntPtr.Zero,

                Int32Rect.Empty,

                BitmapSizeOptions.FromEmptyOptions());

            if (!DeleteObject(hBitmap))

            {

                throw new System.ComponentModel.Win32Exception();

            }

            return wpfBitmap;

        }

        [DllImport("gdi32.dll", SetLastError = true)]

        private static extern bool DeleteObject(IntPtr hObject);

    }

}