C# 生成二维码/解析二维码例子

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
//引用QRCode命名空间,二维码生成规则sln
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
using ThoughtWorks.QRCode.Codec.Util;

namespace ORCode
{
    public partial class frmOrCode : Form
    {
        #region InitializeComponent
        public frmOrCode()
        {
            InitializeComponent();
        }

        private void frmOrCode_Load(object sender, EventArgs e)
        {
            //二维码生成初始选中值，（正常二维码值别的暂时不懂）
            cboEncoding.SelectedIndex = 2;
            cboVersion.SelectedIndex = 6;
            cboCorrectionLevel.SelectedIndex = 1;
        }
        #endregion


        #region 生成二维码操作
        private void btnEncode_Click(object sender, EventArgs e)
        {
            if (txtEncodeData.Text.Trim() == String.Empty)
            {
                MessageBox.Show("输入要生成的内容","提示",MessageBoxButtons.OK,MessageBoxIcon.Error);
                return;
            }
           //实例化二维码组件
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            String encoding = cboEncoding.Text;
            if (encoding == "Byte")
            {
                //Byte 字节(汉字)
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            }
            else if (encoding == "AlphaNumeric")
            {
                // AlphaNumeric 字母数字
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
            }
            else if (encoding == "Numeric")
            {
                //Numeric 数字
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;
            }
            try
            {
                int scale = Convert.ToInt16(txtSize.Text);
                qrCodeEncoder.QRCodeScale = scale;
            }
            catch (Exception ex)
            {
                MessageBox.Show("请选择");
                return;
            }
            try
            {
                int version = Convert.ToInt16(cboVersion.Text);
                qrCodeEncoder.QRCodeVersion = version;
            }
            catch (Exception ex)
            {
                MessageBox.Show("选择版本号!");
            }

            string errorCorrect = cboCorrectionLevel.Text;
            if (errorCorrect == "L")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
            else if (errorCorrect == "M")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            else if (errorCorrect == "Q")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
            else if (errorCorrect == "H")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
            //生成二维码图片
            Image image;
            String data = txtEncodeData.Text;
            try
            {
                image = qrCodeEncoder.Encode(data);
                picEncode.Image = image;
            }
            catch (Exception ex)
            {
                MessageBox.Show("输入内容过长，请选择大于当前版本号的版本");
            }
        }
        #endregion

        #region 保存二维码
        private void btnSave_Click(object sender, EventArgs e)
        {
            //以图片的形式保存二维码图片
            saveFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png";
            saveFileDialog1.Title = "Save";
            saveFileDialog1.FileName = string.Empty;
            saveFileDialog1.ShowDialog();
            if (saveFileDialog1.FileName != "")
            {
                System.IO.FileStream fs =
                   (System.IO.FileStream)saveFileDialog1.OpenFile();
                switch (saveFileDialog1.FilterIndex)
                {
                    case 1:
                        this.picEncode.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Jpeg);
                        break;

                    case 2:
                        this.picEncode.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Bmp);
                        break;

                    case 3:
                        this.picEncode.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Gif);
                        break;
                    case 4:
                        this.picEncode.Image.Save(fs,
                           System.Drawing.Imaging.ImageFormat.Png);
                        break;
                }
                fs.Close();
            }
        }

        #endregion

        #region 解码操作
        private void btnOpen_Click(object sender, EventArgs e)
        {
            //打开二维码文件
            openFileDialog1.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png|All files (*.*)|*.*";
            openFileDialog1.FilterIndex = 1;
            openFileDialog1.RestoreDirectory = true;
            openFileDialog1.FileName = string.Empty;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                String fileName = openFileDialog1.FileName;
                picDecode.Image = new Bitmap(fileName);
            }
        }

        private void btnDecode_Click(object sender, EventArgs e)
        {
            try
            {
                if (picDecode.Image == null)
                { MessageBox.Show("没有二维码图片，请选择"); }
                else
                {
                    QRCodeDecoder decoder = new QRCodeDecoder();
                    String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(picDecode.Image)));
                    txtDecodedData.Text = decodedString;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("该图片不是二维码图片，请重新选择");
            }
        }
        #endregion
    }
}