如何用.NET生成二维码？-白红宇

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：

namespace WinQRCode

{

partial class Form1

{

/// <summary>

/// 必需的设计器变量。

/// </summary>

private System.ComponentModel.IContainer components = null;

/// <summary>

/// 清理所有正在使用的资源。

/// </summary>

/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}

#region Windows 窗体设计器生成的代码

/// <summary>

/// 设计器支持所需的方法 - 不要

/// 使用代码编辑器修改此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.button1 = new System.Windows.Forms.Button();

this.button2 = new System.Windows.Forms.Button();

this.pictureBox1 = new System.Windows.Forms.PictureBox();

this.label1 = new System.Windows.Forms.Label();

this.textBox1 = new System.Windows.Forms.TextBox();

this.label2 = new System.Windows.Forms.Label();

this.lbl解码信息 = new System.Windows.Forms.Label();

((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();

this.SuspendLayout();

// button1

this.button1.Location = new System.Drawing.Point(446, 31);

this.button1.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);

this.button1.Name = "button1";

this.button1.Size = new System.Drawing.Size(103, 37);

this.button1.TabIndex = 0;

this.button1.Text = "编码";

this.button1.UseVisualStyleBackColor = true;

this.button1.Click += new System.EventHandler(this.button1_Click);

// button2

this.button2.Location = new System.Drawing.Point(446, 81);

this.button2.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);

this.button2.Name = "button2";

this.button2.Size = new System.Drawing.Size(103, 37);

this.button2.TabIndex = 1;

this.button2.Text = "解码";

this.button2.UseVisualStyleBackColor = true;

this.button2.Click += new System.EventHandler(this.button2_Click);

// pictureBox1

this.pictureBox1.Location = new System.Drawing.Point(23, 117);

this.pictureBox1.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);

this.pictureBox1.Name = "pictureBox1";

this.pictureBox1.Size = new System.Drawing.Size(279, 253);

this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;

this.pictureBox1.TabIndex = 2;

this.pictureBox1.TabStop = false;

// label1

this.label1.AutoSize = true;

this.label1.Location = new System.Drawing.Point(18, 39);

this.label1.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(69, 25);

this.label1.TabIndex = 3;

this.label1.Text = "信息：";

// textBox1

this.textBox1.Location = new System.Drawing.Point(95, 37);

this.textBox1.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);

this.textBox1.Name = "textBox1";

this.textBox1.Size = new System.Drawing.Size(333, 31);

this.textBox1.TabIndex = 4;

// label2

this.label2.AutoSize = true;

this.label2.Location = new System.Drawing.Point(18, 81);

this.label2.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);

this.label2.Name = "label2";

this.label2.Size = new System.Drawing.Size(88, 25);

this.label2.TabIndex = 5;

this.label2.Text = "二维码：";

// lbl解码信息

this.lbl解码信息.AutoSize = true;

this.lbl解码信息.Location = new System.Drawing.Point(101, 81);

this.lbl解码信息.Margin = new System.Windows.Forms.Padding(4, 0, 4, 0);

this.lbl解码信息.Name = "lbl解码信息";

this.lbl解码信息.Size = new System.Drawing.Size(0, 25);

this.lbl解码信息.TabIndex = 6;

// Form1

this.AutoScaleDimensions = new System.Drawing.SizeF(11F, 24F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(572, 384);

this.Controls.Add(this.lbl解码信息);

this.Controls.Add(this.label2);

this.Controls.Add(this.textBox1);

this.Controls.Add(this.label1);

this.Controls.Add(this.pictureBox1);

this.Controls.Add(this.button2);

this.Controls.Add(this.button1);

this.Font = new System.Drawing.Font("微软雅黑", 10.8F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));

this.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);

this.Name = "Form1";

this.Text = "二维码";

((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();

this.ResumeLayout(false);

this.PerformLayout();

}

#endregion

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Button button2;

private System.Windows.Forms.PictureBox pictureBox1;

private System.Windows.Forms.Label label1;

private System.Windows.Forms.TextBox textBox1;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.Label lbl解码信息;

}

}

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：

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;

namespace WinQRCode

{

using ThoughtWorks.QRCode.Codec;

using ThoughtWorks.QRCode.Codec.Data;

using ThoughtWorks.QRCode.Codec.Util;

using System.IO;

using PdfToImage;

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

/// <summary>

/// 编码

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void button1_Click(object sender, EventArgs e)

{

if (this.textBox1.Text != "")

{

Cursor.Current = Cursors.WaitCursor;

if (textBox1.Text.Trim() == String.Empty)

{

MessageBox.Show("不能为空.");

return;

}

QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;

qrCodeEncoder.QRCodeScale = 4;

qrCodeEncoder.QRCodeVersion = 7;

qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;

System.Drawing.Image image;

String data = textBox1.Text;

//编码

image = qrCodeEncoder.Encode(data);

//图片显示

this.pictureBox1.Image = image;

Cursor.Current = Cursors.Default;

}

}

/// <summary>

/// 解码

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void button2_Click(object sender, EventArgs e)

{

Cursor.Current = Cursors.WaitCursor;

Bitmap b = this.pictureBox1.Image as Bitmap;

{

QRCodeDecoder decoder = new QRCodeDecoder();

//解码

String decodedString = decoder.decode(new QRCodeBitmapImage(b));

//显示解码信息

this.lbl解码信息.Text += decodedString ;

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

Cursor.Current = Cursors.Default;

}

private void Form1_Load(object sender, EventArgs e)

{

}

}

}

4、编译运行，如下图：

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作者：JackWang-CUMT

来源：51CTO