【愚公系列】2023年04月 .NET CORE工具案例-二维码生成器QRCoder

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发布于 2023-05-03 09:29:03

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前言

二维码是一种能够存储数据的编码形式，它可以被扫描器快速识别和解码。二维码通常由黑白相间的方格组成，可以将文本、网址、电子邮件、电话号码等信息编码成矩阵条码的形式，从而方便用户获取信息。二维码的应用范围非常广泛，如商业、广告、新闻、公共交通系统等领域。

条形码，也称为商品条码，是一种以条形图案为基础的一维条码，是商业和物流领域中广泛使用的一种编码方式。它可以迅速、准确地读取产品信息，包括商品名称、价格、品牌、生产日期等，对于追溯产品流转、提高物流效率、防止假冒伪劣产品等方面发挥了巨大的作用。

不好意思，因为带二维码图片csdn会拦截，下面有些图片不能看。

一、二维码生成器QRCoder

1.QRCoder是什么

QRCoder 是用 C#.NET 编写的简单库，使您能够创建 QR 码。它对其他库没有任何依赖关系，在NuGet上作为.NET Framework和.NET Core PCL版本提供，可以自定义像素、颜色、背景色、logo、logo大小、logo边框等属性的二维码。

除了二次位图的二维码格式外，还支持以下格式：

QRCode
ArtQRCode
AsciiQRCode
Base64QRCode
BitmapByteQRCode
PdfByteQRCode
PngByteQRCode
PostscriptQRCode
SvgQRCode
UnityQRCode
XamlQRCode

该库支持以下结构化内容的二维码：

BezahlCode
Bitcoin-Like cryptocurrency payment address：虚拟币付款地址
Bookmark：书签
Calendar events (iCal/vEvent)：日历事件
ContactData(MeCard/vCard)：联系人数据
Geolocation：位置
Girocode
Email：邮件
MMS：多媒体信息服务
Monero 地址/付款
One-Time-Password：一次性密码
Phonenumber：手机号码
RussiaPaymentOrder
Shadowsocks configuration
Skype
SlovenianUpnQr
SMS：短信
SwissQrCode
Url：网址
WhatsApp
WiFi

QRCoder的代码网址：https://github.com/codebude/QRCoder

2.安装包

Install-Package QRCoder

调整OS为windows操作系统

3.普通二维码

3.1 创建二维码

using QRCoder;
using System.Drawing;

//创建二维码
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
Bitmap qrCodeImage = qrCode.GetGraphic(20);
qrCodeImage.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

3.2 设置二维码颜色

using QRCoder;
using System.Drawing;

//创建二维码
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
//设置颜色
//Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, false);
Bitmap qrCodeImage = qrCode.GetGraphic(10, "#efefef", "#2e3e4e");
qrCodeImage.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

3.3 带logo的二维码

1、设置logo

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
//设置logo
//Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, icon: (Bitmap)Image.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"));
Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, icon: (Bitmap)Bitmap.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"));
qrCodeImage.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

2、设置logo图标边框

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
//设置logo
//Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, icon: (Bitmap)Image.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"));
Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, icon: (Bitmap)Bitmap.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"), iconBorderWidth: 6);
qrCodeImage.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

3、设置logo图标边框背景色

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
//设置logo
//Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, icon: (Bitmap)Image.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"));
Bitmap qrCodeImage = qrCode.GetGraphic(10, Color.Black, Color.White, icon: (Bitmap)Bitmap.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"), iconBorderWidth: 6, iconBackgroundColor: Color.DarkGreen);
qrCodeImage.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

4.艺术二维码

4.1 创建二维码

using QRCoder;

//创建二维码
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("This is a quick test! 123#?", QRCodeGenerator.ECCLevel.H);
var bmp = new ArtQRCode(data).GetGraphic(10);

bmp.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

4.2 设置二维码颜色和图像大小

using QRCoder;
using System.Drawing;

//创建二维码
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("This is a quick test! 123#?", QRCodeGenerator.ECCLevel.H);
var finder = new Bitmap(15, 15);
var bmp = new ArtQRCode(data).GetGraphic(10, Color.Black, Color.White, Color.Transparent, finderPatternImage: finder);

bmp.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

4.3 满屏二维码

using QRCoder;
using System.Drawing;

//创建二维码
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("This is a quick test! 123#?", QRCodeGenerator.ECCLevel.H);
var bmp = new ArtQRCode(data).GetGraphic(10, Color.Black, Color.White, Color.Transparent, drawQuietZones: false);

bmp.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

4.4 带logo的二维码

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("This is a quick test! 123#?", QRCodeGenerator.ECCLevel.H);
var bmp = new ArtQRCode(data).GetGraphic((Bitmap)Image.FromFile(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_software engineer_2909346.png"));

bmp.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

5.纯文本二维码

5.1 创建二维码

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
var targetCode = "                                                          \n                                                          \n                                                          \n                                                          \n        ██████████████    ██  ██    ██████████████        \n        ██          ██  ██    ████  ██          ██        \n        ██  ██████  ██  ██  ██  ██  ██  ██████  ██        \n        ██  ██████  ██      ██      ██  ██████  ██        \n        ██  ██████  ██  ██          ██  ██████  ██        \n        ██          ██    ████████  ██          ██        \n        ██████████████  ██  ██  ██  ██████████████        \n                        ██  ████                          \n        ██████████  ████      ████████  ██  ████          \n        ████    ██    ██    ████      ████████  ██        \n            ██  ██  ██████████  ██  ██  ██  ████          \n        ██      ██    ████  ████  ████                    \n          ████████  ██████            ████  ██  ██        \n                                  ████████                \n        ██████████████  ████  ████  ██  ████  ████        \n        ██          ██            ████████                \n        ██  ██████  ██  ██  ██  ██    ██    ██  ██        \n        ██  ██████  ██  ██████    ██  ██                  \n        ██  ██████  ██  ██  ██  ██  ██  ████  ████        \n        ██          ██  ████  ████        ██  ██          \n        ██████████████  ██████          ██  ██████        \n                                                          \n                                                          \n                                                          \n                                                          ";

//Create QR code
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("A05", QRCodeGenerator.ECCLevel.Q);
var asciiCode = new AsciiQRCode(data).GetGraphic(1);

5.2 满屏二维码

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
var targetCode = "██████████████    ██  ██    ██████████████\n██          ██  ██    ████  ██          ██\n██  ██████  ██  ██  ██  ██  ██  ██████  ██\n██  ██████  ██      ██      ██  ██████  ██\n██  ██████  ██  ██          ██  ██████  ██\n██          ██    ████████  ██          ██\n██████████████  ██  ██  ██  ██████████████\n                ██  ████                  \n██████████  ████      ████████  ██  ████  \n████    ██    ██    ████      ████████  ██\n    ██  ██  ██████████  ██  ██  ██  ████  \n██      ██    ████  ████  ████            \n  ████████  ██████            ████  ██  ██\n                          ████████        \n██████████████  ████  ████  ██  ████  ████\n██          ██            ████████        \n██  ██████  ██  ██  ██  ██    ██    ██  ██\n██  ██████  ██  ██████    ██  ██          \n██  ██████  ██  ██  ██  ██  ██  ████  ████\n██          ██  ████  ████        ██  ██  \n██████████████  ██████          ██  ██████";

//Create QR code
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("A05", QRCodeGenerator.ECCLevel.Q);
var asciiCode = new AsciiQRCode(data).GetGraphic(1, drawQuietZones: false);

5.3 x字二维码

using QRCoder;

//创建二维码
var targetCode = "                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n        XXXXXXXXXXXXXX        XXXX  XXXXXXXXXXXXXX        \n        XXXXXXXXXXXXXX        XXXX  XXXXXXXXXXXXXX        \n        XX          XX  XXXXXX  XX  XX          XX        \n        XX          XX  XXXXXX  XX  XX          XX        \n        XX  XXXXXX  XX    XXXXXXXX  XX  XXXXXX  XX        \n        XX  XXXXXX  XX    XXXXXXXX  XX  XXXXXX  XX        \n        XX  XXXXXX  XX    XXXX      XX  XXXXXX  XX        \n        XX  XXXXXX  XX    XXXX      XX  XXXXXX  XX        \n        XX  XXXXXX  XX  XX    XX    XX  XXXXXX  XX        \n        XX  XXXXXX  XX  XX    XX    XX  XXXXXX  XX        \n        XX          XX    XX        XX          XX        \n        XX          XX    XX        XX          XX        \n        XXXXXXXXXXXXXX  XX  XX  XX  XXXXXXXXXXXXXX        \n        XXXXXXXXXXXXXX  XX  XX  XX  XXXXXXXXXXXXXX        \n                          XXXXXXXX                        \n                          XXXXXXXX                        \n            XX  XXXXXX  XXXXXX    XX    XX    XX          \n            XX  XXXXXX  XXXXXX    XX    XX    XX          \n        XX  XXXXXX    XXXX  XXXXXXXX    XXXXXX  XX        \n        XX  XXXXXX    XXXX  XXXXXXXX    XXXXXX  XX        \n                    XX  XX  XX    XX    XX  XX            \n                    XX  XX  XX    XX    XX  XX            \n          XX          XX        XX  XX  XXXXXX            \n          XX          XX        XX  XX  XXXXXX            \n          XX  XXXXXXXX  XXXX  XX    XXXXXXXX    XX        \n          XX  XXXXXXXX  XXXX  XX    XXXXXXXX    XX        \n                        XX    XXXXXXXX        XXXX        \n                        XX    XXXXXXXX        XXXX        \n        XXXXXXXXXXXXXX      XXXXXXXX    XX  XXXXXX        \n        XXXXXXXXXXXXXX      XXXXXXXX    XX  XXXXXX        \n        XX          XX  XXXXXX        XXXXXXXX            \n        XX          XX  XXXXXX        XXXXXXXX            \n        XX  XXXXXX  XX  XX  XXXX        XX  XXXX          \n        XX  XXXXXX  XX  XX  XXXX        XX  XXXX          \n        XX  XXXXXX  XX    XXXX        XXXXXXXX            \n        XX  XXXXXX  XX    XXXX        XXXXXXXX            \n        XX  XXXXXX  XX  XX  XXXXXXXX    XX  XXXXXX        \n        XX  XXXXXX  XX  XX  XXXXXXXX    XX  XXXXXX        \n        XX          XX    XX            XXXX    XX        \n        XX          XX    XX            XXXX    XX        \n        XXXXXXXXXXXXXX    XX    XXXXXX  XXXX  XXXX        \n        XXXXXXXXXXXXXX    XX    XXXXXX  XXXX  XXXX        \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          \n                                                          ";

//Create QR code
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("A", QRCodeGenerator.ECCLevel.Q);
var asciiCode = new AsciiQRCode(data).GetGraphic(2, "X", " ");

6.比特币生成器

using QRCoder;

//创建二维码
var address = "175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W";
var amount = .123;
var label = "Some Label to Encode";
var message = "Some Message to Encode";

var generator = new PayloadGenerator.BitcoinAddress(address, amount, label, message).ToString();

这边不仅仅是比特币，还内置了各种账号生成（莱特币、WIFI账号密码、邮箱账号密码等等）

7.字节二维码

using QRCoder;
using System;
using System.Drawing;

//创建二维码
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("This is a quick test! 123#?", QRCodeGenerator.ECCLevel.L);
var pngCodeGfx = new PngByteQRCode(data).GetGraphic(5, new byte[] { 255, 255, 255, 127 }, new byte[] { 0, 0, 255 }, false);
MemoryStream ms = new MemoryStream(pngCodeGfx);
Bitmap img = (Bitmap)Image.FromStream(ms); 

img.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

8.二维数据生成

var gen = new QRCodeGenerator();

var checkString = string.Empty;
var gField = gen.GetType().GetField("galoisField", BindingFlags.NonPublic | BindingFlags.Static);
foreach (var listitem in (System.Collections.IEnumerable)gField.GetValue(gen))
{
    foreach (PropertyInfo prop in listitem.GetType().GetProperties())
        checkString += prop.GetValue(listitem, null).ToString() + ",";

    checkString += ":";
}

还包含文本等其他方式

9.SVG二维码

using QRCoder;
using QRCoderTests.Helpers;
using System.Drawing;

//创建二维码
var gen = new QRCodeGenerator();
var data = gen.CreateQrCode("This is a quick test! 123#?", QRCodeGenerator.ECCLevel.H);

//Used logo is licensed under public domain. Ref.: https://thenounproject.com/Iconathon1/collection/redefining-women/?i=2909361
var logoSvg = File.ReadAllText(HelperFunctions.GetAssemblyPath() + "\\assets\\noun_Scientist_2909361.svg");
var logoObj = new SvgQRCode.SvgLogo(logoSvg, 20, iconEmbedded: false);

var svg = new SvgQRCode(data).GetGraphic(10, Color.DarkGray, Color.White, logo: logoObj);

挂到网页上就好了

10.WIFI二维码

using QRCoder;
using static QRCoder.PayloadGenerator;


WiFi generator = new WiFi("WIFI名称","WIFI密码",WiFi.Authentication.WPA);
string payload = generator.ToString();

QRCodeGenerator qrGenerator = new QRCodeGenerator();

QRCodeData qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);

var qrCodeAsBitmap = qrCode.GetGraphic(20);

qrCodeAsBitmap.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

11.邮件二维码

using QRCoder;
using static QRCoder.PayloadGenerator;


Mail generator = new Mail("邮件地址","邮件标题", "邮件标题");
string payload = generator.ToString();

QRCodeGenerator qrGenerator = new QRCodeGenerator();

QRCodeData qrCodeData = qrGenerator.CreateQrCode(payload, QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);

var qrCodeAsBitmap = qrCode.GetGraphic(20);

qrCodeAsBitmap.Save(@$"qrCode.jpg", System.Drawing.Imaging.ImageFormat.Bmp);

二、二维码下面加文字说明

public class ImageUtility
{
    /// <summary>
    /// 二维码下面加上文字
    /// </summary>
    /// <param name="qrImg">QR图片</param>
    /// <param name="content">文字内容</param>
    /// <param name="n"></param>
    /// <returns></returns>
    public Bitmap InsertWords(Bitmap qrImg, string content = "")
    {
        Bitmap backgroudImg = new Bitmap(qrImg.Width, qrImg.Height);
        backgroudImg.MakeTransparent();
        Graphics g2 = Graphics.FromImage(backgroudImg);
        g2.Clear(Color.Transparent);
        //画二维码到新的面板上
        g2.DrawImage(qrImg, 0, 0);

        if (!string.IsNullOrEmpty(content))
        {
            FontFamily fontFamily = new FontFamily("楷体");
            Font font1 = new Font(fontFamily, 20f, FontStyle.Bold, GraphicsUnit.Pixel);

            //文字长度 
            int strWidth = (int)g2.MeasureString(content, font1).Width;
            //总长度减去文字长度的一半  （居中显示）
            int wordStartX = (qrImg.Width - strWidth) / 2;
            int wordStartY = qrImg.Height - 30;

            g2.DrawString(content, font1, Brushes.Black, wordStartX, wordStartY);
        }

        g2.Dispose();
        return backgroudImg;
    }
}

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原始发表：2023-04-28，如有侵权请联系 cloudcommunity@tencent.com 删除

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