C# 二维码生成——QRCode

C#二维码生成，这里使用开源的ThoughtWorks.QRCode.dll库。

步骤:

1.下载ThoughtWorks.QRCode.dll库文件，并引用到项目中。

2.创建QRCodeHandler.cs二维码处理类

/// 二维码处理类
    /// 创建人:杨武
    /// 创建日期:2015-01-22
    /// </summary>
    public class QRCodeHandler
    {
        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="data">数据</param>
        /// <param name="filePath">文件保存路径（绝对路径）</param>
        /// <param name="hasLogo">二维码图标是否添加图片</param>
        /// <param name="logoFilePath">图片的路径（绝对路径）</param>
        /// <returns>true--成功；false--失败</returns>
        public static bool CreateQRcode(string data, string filePath, bool hasLogo = false, string logoFilePath = "")
        {
            bool result = false;
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//二维码编码(Byte、AlphaNumeric、Numeric)
            qrCodeEncoder.QRCodeScale = 4;//二维码尺寸(Version为0时，1：26x26，每加1宽和高各加25
            qrCodeEncoder.QRCodeVersion = 8;//二维码密集度0-40
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//二维码纠错能力(L：7% M：15% Q：25% H：30%)
            try
            {
                Image card = qrCodeEncoder.Encode(data, Encoding.UTF8);

                using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    card.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
                    fs.Close();
                }

                if (hasLogo)
                {
                    AddLogo(logoFilePath, card, filePath);
                }

                card.Dispose();
                result = true;
            }
            catch (Exception ex)
            {
                result = false;
            }
            return result;
        }

        /// <summary>
        /// 二维码图标中添加图片
        /// </summary>
        /// <param name="logoFilePath">图片路径</param>
        /// <param name="cord">二维码</param>
        /// <param name="cardSavePath">二维码保存路径</param>
        private static void AddLogo(string logoFilePath, Image cord, string cardSavePath)
        {
            if (string.IsNullOrWhiteSpace(logoFilePath) || cord == null || File.Exists(logoFilePath) == false)
            {
                return;
            }

            using (Image copyImage = Image.FromFile(logoFilePath))
            {
                using (Graphics g = Graphics.FromImage(cord))
                {
                    int x = cord.Width / 2 - copyImage.Width / 2;
                    int y = cord.Height / 2 - copyImage.Height / 2;
                    g.DrawImage(copyImage, new Rectangle(x, y, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                }
                cord.Save(cardSavePath);
            }
        }
    }

3.调用

string str = "http://hao.360.cn/?src=lm&ls=n3335c8fd8f";
            string filtPath = Server.MapPath("~/Images/1.jpg");
            string logoFilePath = Server.MapPath("~/Images/faceIcon.png");
            QRCodeHandler.CreateQRcode(str, filtPath, true, logoFilePath);