C#WinForm二维码编码解码器

使用ThoughtWorks.QRCode组件，该组件是一个免费开源的二维码操作动态链接库，在进行程序编写实现该系统的过程中，应先将ThoughtWorks.QRCode.dll文件通过“添加引用”进行添加，在程序中添加指令集：

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

通过引用该组件中封装的相应的类来实现二维码的生成和解码。其中封装的QRCodeEncoder为二维码编码类，QRCodeDecoder为二维码解码类，QRCodeBitmapImage为位图图像生成类，该类库具体的源码：

1.ORCodeEncoder：二维码编码类

public enum ENCODE_MODE
{ALPHA_NUMERIC,NUMERIC,BYTE
}public enum ERROR_CORRECTION
{L,M,Q,H
}public virtual Bitmap Encode(string content, Encoding encoding)
{bool[][] flagArray = this.calQrcode(encoding.GetBytes(content));SolidBrush brush = new SolidBrush(this.qrCodeBackgroundColor);Bitmap image = new Bitmap((flagArray.Length * this.qrCodeScale) + 1, (flagArray.Length * this.qrCodeScale) + 1);Graphics graphics = Graphics.FromImage(image);graphics.FillRectangle(brush, new Rectangle(0, 0, image.Width, image.Height));brush.Color = this.qrCodeForegroundColor;for (int i = 0; i < flagArray.Length; i++){for (int j = 0; j < flagArray.Length; j++){if (flagArray[j][i]){graphics.FillRectangle(brush, j * this.qrCodeScale, i * this.qrCodeScale, this.qrCodeScale, this.qrCodeScale);}}}return image;
}

2.QRCodeDecoder：二维码解码类

public virtual string decode(QRCodeImage qrCodeImage, Encoding encoding)
{sbyte[] src = this.decodeBytes(qrCodeImage);byte[] dst = new byte[src.Length];Buffer.BlockCopy(src, 0, dst, 0, dst.Length);return encoding.GetString(dst);
}public virtual sbyte[] decodeBytes(QRCodeImage qrCodeImage)
{DecodeResult result;Point[] adjustPoints = this.AdjustPoints;ArrayList list = ArrayList.Synchronized(new ArrayList(10));while (this.numTryDecode < adjustPoints.Length){try{result = this.decode(qrCodeImage, adjustPoints[this.numTryDecode]);if (result.CorrectionSucceeded){return result.DecodedBytes;}list.Add(result);canvas.println("Decoding succeeded but could not correct");canvas.println("all errors. Retrying..");}catch (DecodingFailedException exception){if (exception.Message.IndexOf("Finder Pattern") >= 0){throw exception;}}finally{this.numTryDecode++;}}if (list.Count == 0){throw new DecodingFailedException("Give up decoding");}int num = -1;int numErrors = 0x7fffffff;for (int i = 0; i < list.Count; i++){result = (DecodeResult) list[i];if (result.NumErrors < numErrors){numErrors = result.NumErrors;num = i;}}canvas.println("All trials need for correct error");canvas.println("Reporting #" + num + " that,");canvas.println("corrected minimum errors (" + numErrors + ")");canvas.println("Decoding finished.");return ((DecodeResult) list[num]).DecodedBytes;
}

3.QRCodeBitmapImage：位图图像

public class QRCodeBitmapImage : QRCodeImage
{// Fieldsprivate Bitmap image;// Methodspublic QRCodeBitmapImage(Bitmap image);public virtual int getPixel(int x, int y);// Propertiespublic virtual int Height { get; }public virtual int Width { get; }
}public interface QRCodeImage
{// Methodsint getPixel(int x, int y);// Propertiesint Height { get; }int Width { get; }
}

采用C#WinForm进行二维码编码和解码系统的实现，详细代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;
using ThoughtWorks.QRCode.Codec.Util;
using System.IO;using ControlExs;namespace WindowsQRCode11_22
{public partial class Form1 : Form{private const long WM_GETMINMAXINFO = 0x24;public struct POINTAPI{public int x;public int y;}public struct MINMAXINFO{public POINTAPI ptReserved;public POINTAPI ptMaxSize;public POINTAPI ptMaxPosition;public POINTAPI ptMinTrackSize;public POINTAPI ptMaxTrackSize;}public Form1(){InitializeComponent();this.MaximumSize = new Size(Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height);cbVersion.Text = "7";cbEncoding.Text = "Byte";cbCorrectionLevel.Text = "M";txtData.Text = "请输入数据内容...";  cbScale.Text = "5";btnQRCodeForegroundColor.BackColor = System.Drawing.Color.Black;btnQRCodeBackgroundColor.BackColor = System.Drawing.Color.White;}private void Form1_Load(object sender, EventArgs e){this.WindowState = FormWindowState.Maximized;    //最大化窗体}protected override void WndProc(ref System.Windows.Forms.Message m){base.WndProc(ref m);if (m.Msg == WM_GETMINMAXINFO){MINMAXINFO mmi = (MINMAXINFO)m.GetLParam(typeof(MINMAXINFO));mmi.ptMinTrackSize.x = this.MinimumSize.Width;mmi.ptMinTrackSize.y = this.MinimumSize.Height;if (this.MaximumSize.Width != 0 || this.MaximumSize.Height != 0){mmi.ptMaxTrackSize.x = this.MaximumSize.Width;mmi.ptMaxTrackSize.y = this.MaximumSize.Height;}mmi.ptMaxPosition.x = 1;mmi.ptMaxPosition.y = 1;System.Runtime.InteropServices.Marshal.StructureToPtr(mmi, m.LParam, true);}}//解决窗体闪烁protected override CreateParams CreateParams{get{CreateParams cp = base.CreateParams;if (!DesignMode){cp.ExStyle |= (int)WindowStyle.WS_CLIPCHILDREN;}return cp;}}//生成二维码private void button1_Click(object sender, EventArgs e){button8.Visible = true;string encoding = cbEncoding.Text;string correctionLever = cbCorrectionLevel.Text;int version = Convert.ToInt32(cbVersion.Text);int scale = Convert.ToInt32(cbScale.Text);string data = txtData.Text.Trim();if (data == string.Empty){MessageBox.Show("请输入数据！","警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}if (data == "请输入数据内容..."){DialogResult dr = MessageBox.Show("您确定输入的数据内容为：“请输入数据内容...”吗？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);if (dr == DialogResult.Cancel){txtData.Text = "";return;}else{txtData.Text = "请输入数据内容...";}}QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();//创建一个对象//设置编码模式 //当设定目标图片尺寸小于生成的尺寸时，逐步减小方格尺寸//二维码编码(Byte、AlphaNumeric、Numeric)/*byte模式，可以支持汉字、英文字母、数字、特殊符号等Alphanumeric为混合模式，支持的二维码内容:英文大写字母、数字、9个特殊符号，英文小写字母识别为0Numeric:二维码内容为纯数字1) numeric data (digits 0 - 9);2) alphanumeric data (digits 0 - 9; upper case letters A -Z; nine other characters: space, $ % * + - . / : );*/switch (encoding){case "Byte":qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;break;case "AlphaNumeric":qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;break;case "Numeric":qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;break;}#region//设置编码测量度:值越大生成的二维码图片像素越高//二维码尺寸(Version为0时，1：26x26，每加1宽和高各加25#endregionqrCodeEncoder.QRCodeScale = scale;#region//设置编码版本 //二维码密集度0 - 40/*二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵Version 2是 25 x 25的矩阵Version 3是29的尺寸每增加一个version，就会增加4的尺寸(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高是177 x 177 的正方形There are forty sizes of QR Code symbol referred to as Version 1, Version 2 ... Version 40. Version 1 measures 21modules  21 modules, Version 2 measures 25 modules  25 modules and so on increasing in steps of 4 modulesper side up to Version 40 which measures 177 modules  177 modules. Figures 3 to 8 illustrate the structure ofVersions 1, 2, 6, 7, 14, 21 and 40.*/#endregionqrCodeEncoder.QRCodeVersion = version;#region//设置编码错误纠正//二维码纠错能力(L：7% M：15% Q：25% H：30%)//L->H:修正的错误增加，对应二维码里包含的错误校验信息增加，相对的图形内容也会越来越密集。#endregionif (correctionLever == "L")//L水平7%的字码可被修正{qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;}else if (correctionLever == "M")//M水平15%的字码可被修正{qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;}else if (correctionLever == "Q")//Q水平25%的字码可被修正{qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;}else if (correctionLever == "H")//H水平30%的字码可被修正{qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;}qrCodeEncoder.QRCodeForegroundColor = btnQRCodeForegroundColor.BackColor;//设置二维码前景色qrCodeEncoder.QRCodeBackgroundColor = btnQRCodeBackgroundColor.BackColor;//设置二维码背景色Image image = qrCodeEncoder.Encode(data, Encoding.UTF8);//生成二维码图片if (txtLogo.Text.Trim() != string.Empty)//如果有logo的话则添加logo{Bitmap btm = new Bitmap(txtLogo.Text);Bitmap copyImage = new Bitmap(btm, image.Width / 5, image.Height / 5);Graphics g = Graphics.FromImage(image);int x = image.Width / 2 - copyImage.Width / 2;int y = image.Height / 2 - copyImage.Height / 2;g.DrawImage(copyImage, x, y);}picEncode.Image = image;}//保存二维码到磁盘private void button3_Click(object sender, EventArgs e){SaveFileDialog sfd = new SaveFileDialog();sfd.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png";sfd.Title = "保存二维码";sfd.FileName = string.Empty;if (picEncode.Image != null){if (sfd.ShowDialog() == DialogResult.OK && sfd.FileName != ""){using (FileStream fs = (FileStream)sfd.OpenFile()){switch (sfd.FilterIndex){case 1:picEncode.Image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);break;case 2:picEncode.Image.Save(fs, System.Drawing.Imaging.ImageFormat.Bmp);break;case 3:picEncode.Image.Save(fs, System.Drawing.Imaging.ImageFormat.Gif);break;case 4:picEncode.Image.Save(fs, System.Drawing.Imaging.ImageFormat.Png);break;}}MessageBox.Show("保存成功！");}}else{MessageBox.Show("抱歉，没有要保存的图片！");}}//上传二维码照片private void button2_Click(object sender, EventArgs e){button8.Visible = true;OpenFileDialog ofd = new OpenFileDialog();ofd.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png";if (ofd.ShowDialog() == DialogResult.OK){String fileName = ofd.FileName;picEncode.Image = new Bitmap(fileName);}}//解码private void button4_Click(object sender, EventArgs e){if(picEncode.Image == null){MessageBox.Show("请先上传二维码图片！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);}else{try{string decodedString = new QRCodeDecoder().decode(new QRCodeBitmapImage(new Bitmap(picEncode.Image)), Encoding.UTF8);txtData.Text = decodedString;}catch (Exception){MessageBox.Show("抱歉，无法解码！");}}  }private void groupBox1_Enter(object sender, EventArgs e){}//上传LOGOprivate void button5_Click(object sender, EventArgs e) {OpenFileDialog ofd = new OpenFileDialog();ofd.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|PNG Image|*.png";if (ofd.ShowDialog() == DialogResult.OK){txtLogo.Text = ofd.FileName;}}//撤销LOGOprivate void button9_Click(object sender, EventArgs e){picEncode.Image = null;txtLogo.Text = "";}private void textData_MouseClick(object sender, MouseEventArgs e){txtData.Text = "";}private void label8_Click(object sender, EventArgs e){Font f = new Font("Consolas", 14f, FontStyle.Regular);label9.Font = f;label10.Font = f;Font font = new Font("Consolas", 14f, FontStyle.Underline | FontStyle.Italic);label8.Font = font;label5.Visible = false;label6.Visible = false;btnQRCodeForegroundColor.Visible = false;btnQRCodeBackgroundColor.Visible = false;button5.Visible = false;txtLogo.Visible = false;button9.Visible = false;button7.Visible = true;button6.Visible = false;label1.Visible = true;cbEncoding.Visible = true;label4.Visible = true;cbScale.Visible = true;label2.Visible = true;cbCorrectionLevel.Visible = true;label3.Visible = true;label3.Visible = true;cbVersion.Visible = true;}private void label10_Click(object sender, EventArgs e){Font f = new Font("Consolas", 14f, FontStyle.Regular);label8.Font = f;label9.Font = f;Font font = new Font("Consolas", 14f, FontStyle.Underline | FontStyle.Italic);label10.Font = font;label1.Visible = false;cbEncoding.Visible = false;label4.Visible = false;cbScale.Visible = false;label2.Visible = false;cbCorrectionLevel.Visible = false;label3.Visible = false;label3.Visible = false;cbVersion.Visible = false;label5.Visible = false;label6.Visible = false;btnQRCodeForegroundColor.Visible = false;btnQRCodeBackgroundColor.Visible = false;button7.Visible = false;button6.Visible = false;button5.Visible = true;txtLogo.Visible = true;button9.Visible = true;}    private void label9_Click(object sender, EventArgs e){Font f = new Font("Consolas", 14f, FontStyle.Regular);label8.Font = f;label10.Font = f;Font font = new Font("Consolas", 14f, FontStyle.Underline | FontStyle.Italic);label9.Font = font;label1.Visible = false;cbEncoding.Visible = false;label4.Visible = false;cbScale.Visible = false;label2.Visible = false;cbCorrectionLevel.Visible = false;label3.Visible = false;label3.Visible = false;cbVersion.Visible = false;button5.Visible = false;txtLogo.Visible = false;button9.Visible = false;button7.Visible = false;button6.Visible = true;label5.Visible = true;label6.Visible = true;btnQRCodeForegroundColor.Visible = true;btnQRCodeBackgroundColor.Visible = true;}private void button6_Click(object sender, EventArgs e){btnQRCodeForegroundColor.BackColor = System.Drawing.Color.Black;btnQRCodeBackgroundColor.BackColor = System.Drawing.Color.White;}private void button7_Click(object sender, EventArgs e){cbVersion.Text = "7";cbEncoding.Text = "Byte";cbCorrectionLevel.Text = "M";cbScale.Text = "5";}private void button8_Click(object sender, EventArgs e){cbVersion.Text = "7";cbEncoding.Text = "Byte";cbCorrectionLevel.Text = "M";cbScale.Text = "5";btnQRCodeForegroundColor.BackColor = System.Drawing.Color.Black;btnQRCodeBackgroundColor.BackColor = System.Drawing.Color.White;txtData.Text = "";picEncode.Image = null;txtLogo.Text = "";}private void cbVersion_Click(object sender, EventArgs e){MessageBox.Show("请尽量选择5-23范围内的Version值，确保生成的二维码能被准确解读","提示", MessageBoxButtons.OK,MessageBoxIcon.Information);}private void btnQRCodeBackgroundColor_Click(object sender, EventArgs e){colorDialog2.ShowDialog();btnQRCodeBackgroundColor.BackColor = colorDialog2.Color;}private void btnQRCodeForegroundColor_Click(object sender, EventArgs e){colorDialog1.ShowDialog();btnQRCodeForegroundColor.BackColor = colorDialog1.Color;}//隐藏textBox控件的竖形指针[DllImport("user32.dll")]static extern bool HideCaret(IntPtr hWnd);private void btnQRCodeBackgroundColor_MouseDown(object sender, MouseEventArgs e){HideCaret(btnQRCodeBackgroundColor.Handle);}private void btnQRCodeForegroundColor_MouseDown(object sender, MouseEventArgs e){HideCaret(btnQRCodeForegroundColor.Handle);}private void btnQRCodeBackgroundColor_MouseUp(object sender, MouseEventArgs e){HideCaret(btnQRCodeBackgroundColor.Handle);}private void btnQRCodeForegroundColor_MouseUp(object sender, MouseEventArgs e){HideCaret(btnQRCodeForegroundColor.Handle);}}}

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