C#生成和識別二維碼

用到外部一個DLL文件(ThoughtWorks.QRCode.dll)，看效果

生成截圖

識別截圖

生成二維碼后右鍵菜單可以保存二維碼圖片，然后可以到識別模式下進行識別，當然生成后可以用手機掃描識別出來，或者用手機直接掃描以上兩張圖也能看到識別后的結果。

使用方法，在解決方案中引用上面那個dll文件，引入命名空間

using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;

看完整的生成二維碼代碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
namespace 二維碼
{
    public partial class UC_To : UserControl
    {
        public UC_To()
        {
            InitializeComponent();
        }
            
        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Trim() != "")
            {
                string enCodeString = textBox1.Text;
                QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
                pictureBox1.Image = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);
            }
            //else
                //MessageBox.Show("請輸入內容");
        }
            
        private void 保存圖片ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (pictureBox1.Image != null)
            {
                SaveFileDialog s = new SaveFileDialog();
                s.Title = "保存二維碼圖片";
                s.Filter = "圖片文件(*.jpg)|*.jpg";
                if(s.ShowDialog()==DialogResult.OK)
                try
                {
                    pictureBox1.Image.Save(s.FileName,System.Drawing.Imaging.ImageFormat.Jpeg);
                    MessageBox.Show("保存成功");
                }
                catch { MessageBox.Show("保存失敗"); }
            }
        }
    }
}

看完整的識別二維碼的代碼

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
namespace 二維碼
{
    public partial class UC_From : UserControl
    {
        public UC_From()
        {
            InitializeComponent();
        }
        string filepath = "";
        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog p = new OpenFileDialog();
            p.Title = "請選擇二維碼文件";
            p.Filter = "圖片文件(*.jpg)|*.jpg";
            p.Multiselect = false;
            if (p.ShowDialog() == DialogResult.OK)
            {
                filepath = p.FileName;
                System.Threading.Thread t = new System.Threading.Thread(ss);
                t.IsBackground = true;
                t.Start();
            }
        }
        private void ss()
        {
            if (filepath != "")
            {
                string tt = "";
                try
                {
                    Invoke((EventHandler)delegate
                    {
                        button1.Enabled = false;
                        button1.Text = "Waiting！";
                        pictureBox1.Image = new Bitmap(filepath);
                    });
                    //pictureBox1.Size = new Size(new Bitmap(filepath).Size.Width, new Bitmap(filepath).Size.Height);
                    QRCodeDecoder qrDecoder = new QRCodeDecoder();
                    string txtMsg = qrDecoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)), Encoding.UTF8);
                    tt = txtMsg;
                }
                catch { tt = "識別失敗"; }
                Invoke((EventHandler)delegate
                {
                    textBox1.Text = tt;
                    button1.Enabled = true;
                    button1.Text = "識別";
                });
            }
            System.Threading.Thread.CurrentThread.Abort();
        }
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            e.Handled = true;
        }
    }
}