摄像头拍照，解析二维码

C#语言基础

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开发语言：C#
实例大小：0.37M
下载次数：232
浏览次数：1186
发布时间：2015-10-15
实例类别：C#语言基础
发布人：liutuo
文件格式：.zip
所需积分：0

实例介绍

【实例简介】自动解析摄像头中的二维码
【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;
 
namespace QRCodeService
{
    public partial class MainForm : Form
    {
        //摄像头对象
        private Capture cam;
        //计时器
        System.Timers.Timer _timer = null;
        //扫描时间频率(毫秒)
        private int scanTime = 250;
        private bool videoState = false;
        private IContainer componentss;
 
 
        public MainForm()
        {
            Control.CheckForIllegalCrossThreadCalls = false;
            InitializeComponent();
            pictureBox1.Visible = false;
            btnStop.Enabled = false;
        }
 
        //点击开始扫描
        private void btnStart_Click(object sender, EventArgs e)
        {
            Console.WriteLine("摄像头启动");
            btnStart.Enabled = false;
            btnStop.Enabled = true;
            StartCam();
            if (_timer != null && _timer.Enabled)
            {
                _timer.Stop();
                _timer.Dispose();
            }
            //定时器启动，设置扫描频率
            _timer = new System.Timers.Timer(scanTime);
            _timer.Start();
            _timer.Elapsed  = new System.Timers.ElapsedEventHandler(_timer_Elapsed);
        }
 
        //定时器工作
        void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            Console.WriteLine("扫描开始");
            try
            {
                //摄像头截屏
                string result = SnapShot();
                if (string.IsNullOrEmpty(result))
                {
 
                    if (pictureBox1.Image == null)
                    {
                        return;
                    }
                    else
                    {
                        try
                        {
                            result = RQDecode(new Bitmap(pictureBox1.Image));
                            Console.WriteLine(result);
                        }
                        catch (Exception ss)
                        { }
                        if (null != result && !string.IsNullOrEmpty(result))
                        {
                            this.textBoxMsg1.Text = result;
                            CreateQRCode(result);
                            Console.WriteLine("扫描完毕");
                        }
                        else
                        {
                            Console.WriteLine("未扫描到二维码。");
                            this.textBoxMsg1.Text = "未扫描到二维码。";
                            pictureBox3.Image = null;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            Console.WriteLine("扫描结束");
 
        }
 
 
        //点击停止扫描
        private void btnStop_Click(object sender, EventArgs e)
        {
            Console.WriteLine("摄像头关闭");
            btnStop.Enabled = false;
            btnStart.Enabled = true;
            textBoxMsg1.Text = string.Empty;
 
            //摄像头停止
            StopCam();
            //计时器循环扫描停止
            _timer.Stop();
            _timer.Dispose();
        }
 
        //生成二维码，并显示到界面
        private void CreateQRCode(string content)
        {
 
                EncodingOptions options = null;
                BarcodeWriter writer = null;
                options = new QrCodeEncodingOptions
                {
                    DisableECI = true,
                    CharacterSet = "UTF-8",
                    Width = pictureBox3.Width,
                    Height = pictureBox3.Height
                };
                writer = new BarcodeWriter();
                writer.Format = BarcodeFormat.QR_CODE;
                writer.Options = options;
 
                Bitmap bitmap = writer.Write(content);
                pictureBox3.Image = bitmap;
        }
 
        //--截图
        private string SnapShot()
        {
            Cursor.Current = Cursors.WaitCursor;
            if (m_ip != IntPtr.Zero)
            {
                Marshal.FreeCoTaskMem(m_ip);
                m_ip = IntPtr.Zero;
            }
 
            m_ip = cam.Click();
            Bitmap b = new Bitmap(cam.Width, cam.Height, cam.Stride, PixelFormat.Format24bppRgb, m_ip);
 
            b.RotateFlip(RotateFlipType.RotateNoneFlipY);
            b = ResizeImage(b, pictureBox1);
            pictureBox1.Image = b;
 
            Bitmap bit = null;
            bit = new Bitmap(pictureBox1.Width, pictureBox1.Height);
 
            Graphics g = Graphics.FromImage(bit);
            g.CopyFromScreen(this.PointToScreen(pictureBox1.Location), new Point(0, 0), bit.Size);
            g.Dispose();
            string result = string.Empty;
            try
            {
                //扫描二维码
                result = RQDecode(bit);
                Console.WriteLine(result);
            }
            catch (Exception ex)
            {
                 
            }
            if (!string.IsNullOrEmpty(result))
            {
                //生成二维码
                CreateQRCode(result);
            }
            Cursor.Current = Cursors.Default;
            return result;
        }
 
        //--重置图像大小
        private Bitmap ResizeImage(Bitmap bmp, PictureBox picBox)
        {
            float xRate = (float)bmp.Width / picBox.Size.Width;
            float yRate = (float)bmp.Height / picBox.Size.Height;
            if (xRate <= 1 && yRate <= 1)
            {
                return bmp;
            }
            else
            {
                float tRate = (xRate >= yRate) ? xRate : yRate;
                Graphics g = null;
                try
                {
                    int newW = (int)(bmp.Width / tRate);
                    int newH = (int)(bmp.Height / tRate);
                    Bitmap b = new Bitmap(newW, newH);
                    g = Graphics.FromImage(b);
                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
                    g.Dispose();
                    return b;
                }
                catch
                {
                    return null;
                }
                finally
                {
                    if (null != g)
                    {
                        g.Dispose();
                    }
                }
            }
        }
 
        //--解码
        private string RQDecode(Bitmap img)
        {
            string errText = string.Empty;
            Result result = null;
            if (img != null)
            {
                try
                {
                    result = new BarcodeReader().Decode(img);
                }
                catch { return errText; }
                if (result != null)
                {
                    return result.Text;
                }
                else
                {
                    return errText;
                }
            }
            else
            {
                return errText;
            }
        }
 
        //--开启摄像头
        private void StartCam()
        {
            const int VIDEODEVICE = 0;
            const int VIDEOWIDTH = 640;
            const int VIDEOHEIGHT = 480;
            const int VIDEOBITSPERPIXEL = 32;
 
            cam = new Capture(VIDEODEVICE, VIDEOWIDTH, VIDEOHEIGHT, VIDEOBITSPERPIXEL, pictureBox2);
            videoState = true;
        }
 
        //--停止摄像头
        private void StopCam()
        {
            cam.Dispose();
            if (m_ip != IntPtr.Zero)
            {
                Marshal.FreeCoTaskMem(m_ip);
                m_ip = IntPtr.Zero;
            }
            videoState = false;
        }
 
        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            PictureBox p = (PictureBox)sender;
            Pen pp = new Pen(System.Drawing.Color.Red);
            e.Graphics.DrawRectangle(pp, e.ClipRectangle.X, e.ClipRectangle.Y, e.ClipRectangle.X   e.ClipRectangle.Width - 1, e.ClipRectangle.Y   e.ClipRectangle.Height - 1);
 
        }
 
        private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            try
            {
                StopCam();
            }
            catch (Exception ex) { }
 
            try
            {
                Dispose();
            }
            catch(Exception exx) { }
        }
    }
}

标签： 二维码摄像头拍照

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