using System;

using System.Collections.Generic;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Linq;

using System.Web;

using ThoughtWorks.QRCode;

using ThoughtWorks.QRCode.Codec;

namespace WebApplication3

{

    public class QRCodeEncoderDemo

    {

        /// <summary>  

        /// 生成二维码.  

        /// </summary>  

        /// <param name="data">需要添加进去的文本</param>  

        /// <returns></returns>  

        public System.Drawing.Image GCode(String data)

        {

           QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

            qrCodeEncoder.QRCodeScale = 5;

            qrCodeEncoder.QRCodeVersion = 7;

            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;

            var pbImg = qrCodeEncoder.Encode(data, System.Text.Encoding.UTF8);

            var width = pbImg.Width / 10;

            var dwidth = width * 2;

            Bitmap bmp = new Bitmap(pbImg.Width + dwidth, pbImg.Height + dwidth);

            Graphics g = Graphics.FromImage(bmp);

            var c = System.Drawing.Color.White;

            g.FillRectangle(new SolidBrush(c), 0, 0, pbImg.Width + dwidth, pbImg.Height + dwidth);

            g.DrawImage(pbImg, width, width);

            g.Dispose();

            return bmp;

        }

        /// <summary>  

        /// 调用此函数后使此两种图片合并，类似相册，有个  

        /// 背景图，中间贴自己的目标图片  

        /// </summary>  

        /// <param name="sourceImg">粘贴的源图片</param>  

        /// <param name="destImg">粘贴的目标图片</param>  

        public static System.Drawing.Image CombinImage(System.Drawing.Image imgBack, string destImg)

        {

            System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片图片    

            if (img.Height != 50 || img.Width != 50)

            {

                img = KiResizeImage(img, 60, 60, 0);

            }

            Graphics g = Graphics.FromImage(imgBack);

            //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高); 

            g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);        

            //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);

            //相片四周刷一层黑色边框  

            //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 照片高);  

            g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);

            GC.Collect();

            return imgBack;

        }

        /// <summary>  

        /// Resize图片  

        /// </summary>  

        /// <param name="bmp">原始Bitmap</param>  

        /// <param name="newW">新的宽度</param>  

        /// <param name="newH">新的高度</param>  

        /// <param name="Mode">保留着，暂时未用</param>  

        /// <returns>处理以后的图片</returns>  

        public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode)

        {

            try

            {

                System.Drawing.Image b = new Bitmap(newW, newH);

                Graphics g = Graphics.FromImage(b);

                // 插值算法的质量  

                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;

            }

        }

    }

}

        protected void BtnCreate_Click(object sender, EventArgs e)

        {         

            QRCodeEncoderDemo qrc = new QRCodeEncoderDemo();

            //生成二维码图片

            System.Drawing.Image ImageBack=qrc.GCode(this.txtstr.Text.ToString());

            string DestImg = Server.MapPath(@"~/Image/psb.jpg");

            System.Drawing.Image Img = QRCodeEncoderDemo.CombinImage(ImageBack, DestImg);

            string filename = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";

            Img.Save(Server.MapPath(@"~/Image/") + filename);

            this.Img.ImageUrl = "~/Image/" + filename;

        }

protected void Button1_Click(object sender, EventArgs e)

        {

            QRCodeDecoder decoder = new QRCodeDecoder();

           Bitmap bt = new Bitmap(Server.MapPath(@"~/Image/"+this.Img.ImageUrl.Substring(this.Img.ImageUrl.LastIndexOf('/'))));

            string decodedString = decoder.decode(new QRCodeBitmapImage(bt),Encoding.UTF8);

            this.TxtContent.Text = decodedString;

        }