C# PDF、winform 生成解析二维码

PDF 生成、解析二维码

界面样式：

第一步：下载ThoughtWorks.QRCode.dll 类并引用 

地址  http://download.csdn.net/detail/liwb1987/8500113

第二步：设置控件到界面上

第三部：生成按钮下代码

  private void btnCreateQRCodeClick(object sender, RoutedEventArgs e)
        {
            try
            {
                ShowQRCode();
            }
            catch (Exception ex)
            {
                MessageBox.Show("生成二维码出错！", "系统提示");
                return;
            }
        }

ShowQRCode();  在这个方法里面有调用了三个方法都有返回值

        /// <summary>
        /// 显示生成的二维码
        /// </summary>
        public void ShowQRCode()
        {
            if (txtQRCodeContent.Text.Trim().Length <= 0)
            {
                MessageBox.Show("二维码内容不能为空，请输入内容！", "系统提示");
                txtQRCodeContent.Focus();
                return;
            }
            bimg = CreateQRCode(txtQRCodeContent.Text);
            imgQRcode.Source = BitmapToBitmapImage(bimg);
            ResetImageStrethch(imgQRcode, bimg);
        }

 （1）CreateQRCode 将文本转换成为 Bitmap 格式

        public Bitmap CreateQRCode(string content)
        {
            QRCodeEncoder qrEncoder = new QRCodeEncoder();
            qrEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrEncoder.QRCodeScale = Convert.ToInt32(txtSize.Text);
            qrEncoder.QRCodeVersion = Convert.ToInt32(cboVersion.SelectedValue);
            qrEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            try
            {
                Bitmap qrcode = qrEncoder.Encode(content, Encoding.UTF8);
                if (!logoImagepath.Equals(string.Empty))
                {
                    Graphics g = Graphics.FromImage(qrcode);
                    Bitmap bitmapLogo = new Bitmap(logoImagepath);
                    int logoSize = Convert.ToInt32(txtLogoSize.Text);
                    bitmapLogo = new Bitmap(bitmapLogo, new System.Drawing.Size(logoSize, logoSize));
                    PointF point = new PointF(qrcode.Width / 2 - logoSize / 2, qrcode.Height / 2 - logoSize / 2);
                    g.DrawImage(bitmapLogo, point);
                }
                return qrcode;
            }
            catch (IndexOutOfRangeException ex)
            {
                MessageBox.Show("超出当前二维码版本的容量上限，请选择更高的二维码版本！", "系统提示");
                return new Bitmap(100, 100);
            }
            catch (Exception ex)
            {
                MessageBox.Show("生成二维码出错！", "系统提示");
                return new Bitmap(100, 100);
            }
        }

BitmapToBitmapImage 再次转换成image  格式 显示在界面上

      public BitmapImage BitmapToBitmapImage(Bitmap bitmap)
        {
            BitmapImage bImage = new BitmapImage();
            MemoryStream ms = new MemoryStream();
            bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
            bImage.BeginInit();
            bImage.StreamSource = new MemoryStream(ms.ToArray());
            bImage.EndInit();
            return bImage;
        }

ResetImageStrethch（填充附加图片）

  private void ResetImageStrethch(System.Windows.Controls.Image img, Bitmap bImg)
        {
            if (bImg.Width <= img.Width)
            {
                img.Stretch = Stretch.None;
            }
            else
            {
                img.Stretch = Stretch.Fill;
            }
        }

添加Logo   添加按钮

    /// <summary>
        /// 添加Logo按钮处理事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnAddLogoClick(object sender, RoutedEventArgs e)
        {
            OpenFileDialog openDialog = new OpenFileDialog();
            openDialog.Filter = "图片文件|*.jpg;*.png;*.gif|All files(*.*)|*.*";
            if (openDialog.ShowDialog() == true)
            {
                logoImagepath = openDialog.FileName;
                Bitmap bImg = new Bitmap(logoImagepath);
                imgLogo.Source = new BitmapImage(new Uri(openDialog.FileName));
                ResetImageStrethch(imgLogo, bImg);
            }
        }

第三步  解析二维码

解析按钮下代码

  private void DecodeQRCodeClick(object sender, RoutedEventArgs e)
        {
            try
            {
                tbDecodeResult.Text = "";
                DecodeQRCode();
            }
            catch (Exception ex)
            {
                MessageBox.Show("解析二维码出错！", "系统提示");
                return;
            }
        }

DecodeQRCode()方法

       /// <summary>
        /// 解析二维码
        /// </summary>
        public void DecodeQRCode()
        {
            if (bimg == null)
            {
                MessageBox.Show("请先打开一张二维码图片！", "系统提示");
                return;
            }
            QRCodeDecoder qrDecoder = new QRCodeDecoder();
            QRCodeImage qrImage = new QRCodeBitmapImage(bimg);
            tbDecodeResult.Text = qrDecoder.decode(qrImage, Encoding.UTF8);
        }

将解析的内容显示在界面上

第四步 

打开二维码按钮

    OpenFileDialog openDialog = new OpenFileDialog();
            openDialog.Filter = "图片文件|*.jpg;*.png;*.gif|All files(*.*)|*.*";
            if (openDialog.ShowDialog() == true)
            {
                bimg = new Bitmap(openDialog.FileName);
                imgQRcode.Source = new BitmapImage(new Uri(openDialog.FileName));
                ResetImageStrethch(imgQRcode, bimg);
            }

保存按钮

  private void btnSaveClick(object sender, RoutedEventArgs e)
        {
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.Filter = "Png文件(*.Png)|*.png|All files(*.*)|*.*";
            if (saveDialog.ShowDialog() == true)
            {
                try
                {
                    SaveQRCode(saveDialog.FileName);
                    MessageBox.Show("保存成功！", "系统提示");
                }
                catch (Exception ex)
                {
                    MessageBox.Show("保存二维码出错！", "系统提示");
                    return;
                }
            }
        }

C#  winform生成二维码

界面样式