如何用.NET生成二维码?
二维码是用某种特定的几何图形按一定规律在平面(二维方向上)分布的黑白相间的图形记录数据符号信息的,国外对二维码技术的研究始于20世纪80年代末,在二维码符号表示技术研究方面已研制出多种码制,常见的有PDF417、QR Code、Code 49、Code 16K、Code One等。二维码技术已经被广泛应用于公安、外交、军事等部门对各类证件的管理,而且也将二维码应用于海关、税务等部门对各类报表和票据的管理,商业、交通运输等部门对商品及货物运输的管理、邮政部门对邮政包裹的管理、工业生产领域对工业生产线的自动化管理。
下面介绍一下如何用.NET生成二维码(QR Code码制),下面给出详细步骤:
1、新建一个window应用程序,然后引入.NET二维码类库(开源的类库,可从网上下载):
2、构建UI界面,代码如下:
1 namespace WinQRCode 2 { 3 partial class Form1 4 { 5 /// <summary> 6 /// 必需的设计器变量。 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// 清理所有正在使用的资源。 12 /// </summary> 13 /// <param name="disposing">如果应释放托管资源,为 true;否则为 false。</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows 窗体设计器生成的代码 24 25 /// <summary> 26 /// 设计器支持所需的方法 - 不要 27 /// 使用代码编辑器修改此方法的内容。 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.button1 = new System.Windows.Forms.Button(); 32 this.button2 = new System.Windows.Forms.Button(); 33 this.pictureBox1 = new System.Windows.Forms.PictureBox(); 34 this.label1 = new System.Windows.Forms.Label(); 35 this.textBox1 = new System.Windows.Forms.TextBox(); 36 this.label2 = new System.Windows.Forms.Label(); 37 this.lbl解码信息 = new System.Windows.Forms.Label(); 38 ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit(); 39 this.SuspendLayout(); 40 // 41 // button1 42 // 43 this.button1.Location = new System.Drawing.Point(446, 31); 44 this.button1.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5); 45 this.button1.Name = "button1"; 46 this.button1.Size = new System.Drawing.Size(103, 37); 47 this.button1.TabIndex = 0; 48 this.button1.Text = "编码"; 49 this.button1.UseVisualStyleBackColor = true; 50 this.button1.Click += new System.EventHandler(this.button1_Click); 51 // 52 // button2 53 // 54 this.button2.Location = new System.Drawing.Point(446, 81); 55 this.button2.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5); 56 this.button2.Name = "button2"; 57 this.button2.Size = new System.Drawing.Size(103, 37); 58 this.button2.TabIndex = 1; 59 this.button2.Text = "解码"; 60 this.button2.UseVisualStyleBackColor = true; 61 this.button2.Click += new System.EventHandler(this.button2_Click); 62 // 63 // pictureBox1 64 // 65 this.pictureBox1.Location = new System.Drawing.Point(23, 117); 66 this.pictureBox1.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5); 67 this.pictureBox1.Name = "pictureBox1"; 68 this.pictureBox1.Size = new System.Drawing.Size(279, 253); 69 this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage; 70 this.pictureBox1.TabIndex = 2; 71 this.pictureBox1.TabStop = false; 72 // 73 // label1 74 // 75 this.label1.AutoSize = true; 76 this.label1.Location = new System.Drawing.Point(18, 39); 77 this.label1.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0); 78 this.label1.Name = "label1"; 79 this.label1.Size = new System.Drawing.Size(69, 25); 80 this.label1.TabIndex = 3; 81 this.label1.Text = "信息:"; 82 // 83 // textBox1 84 // 85 this.textBox1.Location = new System.Drawing.Point(95, 37); 86 this.textBox1.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5); 87 this.textBox1.Name = "textBox1"; 88 this.textBox1.Size = new System.Drawing.Size(333, 31); 89 this.textBox1.TabIndex = 4; 90 // 91 // label2 92 // 93 this.label2.AutoSize = true; 94 this.label2.Location = new System.Drawing.Point(18, 81); 95 this.label2.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0); 96 this.label2.Name = "label2"; 97 this.label2.Size = new System.Drawing.Size(88, 25); 98 this.label2.TabIndex = 5; 99 this.label2.Text = "二维码:"; 100 // 101 // lbl解码信息 102 // 103 this.lbl解码信息.AutoSize = true; 104 this.lbl解码信息.Location = new System.Drawing.Point(101, 81); 105 this.lbl解码信息.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0); 106 this.lbl解码信息.Name = "lbl解码信息"; 107 this.lbl解码信息.Size = new System.Drawing.Size(0, 25); 108 this.lbl解码信息.TabIndex = 6; 109 // 110 // Form1 111 // 112 this.AutoScaleDimensions = new System.Drawing.SizeF(11F, 24F); 113 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 114 this.ClientSize = new System.Drawing.Size(572, 384); 115 this.Controls.Add(this.lbl解码信息); 116 this.Controls.Add(this.label2); 117 this.Controls.Add(this.textBox1); 118 this.Controls.Add(this.label1); 119 this.Controls.Add(this.pictureBox1); 120 this.Controls.Add(this.button2); 121 this.Controls.Add(this.button1); 122 this.Font = new System.Drawing.Font("微软雅黑", 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); 123 this.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5); 124 this.Name = "Form1"; 125 this.Text = "二维码"; 126 ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit(); 127 this.ResumeLayout(false); 128 this.PerformLayout(); 129 130 } 131 132 #endregion 133 134 private System.Windows.Forms.Button button1; 135 private System.Windows.Forms.Button button2; 136 private System.Windows.Forms.PictureBox pictureBox1; 137 private System.Windows.Forms.Label label1; 138 private System.Windows.Forms.TextBox textBox1; 139 private System.Windows.Forms.Label label2; 140 private System.Windows.Forms.Label lbl解码信息; 141 } 142 }
图形如下所示:
3、编写 编码和解码按钮事件,进行编码和解码处理:
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 10 namespace WinQRCode 11 { 12 using ThoughtWorks.QRCode.Codec; 13 using ThoughtWorks.QRCode.Codec.Data; 14 using ThoughtWorks.QRCode.Codec.Util; 15 using System.IO; 16 using PdfToImage; 17 public partial class Form1 : Form 18 { 19 public Form1() 20 { 21 InitializeComponent(); 22 } 23 /// <summary> 24 /// 编码 25 /// </summary> 26 /// <param name="sender"></param> 27 /// <param name="e"></param> 28 private void button1_Click(object sender, EventArgs e) 29 { 30 if (this.textBox1.Text != "") 31 { 32 Cursor.Current = Cursors.WaitCursor; 33 if (textBox1.Text.Trim() == String.Empty) 34 { 35 MessageBox.Show("不能为空."); 36 return; 37 } 38 QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); 39 qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; 40 qrCodeEncoder.QRCodeScale = 4; 41 qrCodeEncoder.QRCodeVersion = 7; 42 qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; 43 System.Drawing.Image image; 44 String data = textBox1.Text; 45 //编码 46 image = qrCodeEncoder.Encode(data); 47 //图片显示 48 this.pictureBox1.Image = image; 49 Cursor.Current = Cursors.Default; 50 51 } 52 } 53 /// <summary> 54 /// 解码 55 /// </summary> 56 /// <param name="sender"></param> 57 /// <param name="e"></param> 58 private void button2_Click(object sender, EventArgs e) 59 { 60 Cursor.Current = Cursors.WaitCursor; 61 Bitmap b = this.pictureBox1.Image as Bitmap; 62 try 63 { 64 QRCodeDecoder decoder = new QRCodeDecoder(); 65 //解码 66 String decodedString = decoder.decode(new QRCodeBitmapImage(b)); 67 //显示解码信息 68 this.lbl解码信息.Text += decodedString ; 69 } 70 catch (Exception ex) 71 { 72 MessageBox.Show(ex.Message); 73 } 74 Cursor.Current = Cursors.Default; 75 } 76 77 private void Form1_Load(object sender, EventArgs e) 78 { 79 80 } 81 } 82 }
4、编译运行,如下图:
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分类: C#