Generate QR code images in Deno

📇 QR Code

Generate QR codes in Deno, as base64-encoded images, completely dependency-free and requires no binary.

This is a port of zenozeng/node-yaqrcode, which itself is a port of the QR code generator in the d-project.

⭐ Getting started

import { qrcode } from "https://deno.land/x/qrcode/mod.ts";
const base64Image = qrcode("bitcoin:ADDRESS?amount=0.5&label=ORDER"); // data:image/gif;base64,...

You can also add a custom size by specifying size in the second parameter:

const fixedSizeImage = qrcode("bitcoin:ADDRESS?amount=0.5&label=ORDER", { size: 500 });

CLI with DPX

After installing DPX, you can directly use the CLI using the dpx command:

dpx qrcode <text>

CLI

Alternatively, you can use it directly from the CLI by using deno run:

deno run https://deno.land/x/qrcode/cli.ts <text>

You can also install it globally using the following:

deno install https://deno.land/x/qrcode/cli.ts

Then, the package is available to run:

qrcode <text>

💻 Development

Run tests:

deno test

Notes

To support typeNumber 40, use the RS_BLOCK_TABLE from davidshimjs/qrcodejs
To support UTF-8, use the code from davidshimjs/qrcodejs
Returns a base64-encoded image URL

⭐ Related Work

zenozeng/node-yaqrcode is the Node.js project that is the origin of this implementation

Download Details:

Author: denorg

Source Code: https://github.com/denorg/qrcode

#deno #node #nodejs #javascript

How to Generate a QR Code Image in Four Lines of Code

A QR code is a computer-readable identification that contains data about the item to which it is attached. The article demonstrates how to return the QR Code image as a response from .Net Core API.

QR-Code Live Demo

Prerequisites

Visual Studio or Visual Studio Code already installed
Install the below package, i.e., “QRCoder” via NuGet package manager.

Let’s Start

The “QRCoder” DLL helps generate QR codes with just four lines of code in C#.

4 Lines of Code Snippet

QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q);
QRCode qrCode = new QRCode(qrCodeData);
Bitmap qrCodeImage = qrCode.GetGraphic(20);

Description of each line of code

**Initialize the QR code generator class: **Create an instance of the QRCodeGenerator class.

QRCodeGenerator qrGenerator = new QRCodeGenerator();

**Create QR code data: **The next step is to initialize QR code data using the CreateQrCode method, which takes two arguments, i.e., string text for encoding inside the QR code, and another case defines the error correction level, i.e., ECCLevel.

Here, four different levels L (7%), M (15%), Q (25%), and H (30%) are available, whereby the percentage represents the hidden portion of the QR-code until the error correction algorithm can’t recreate the original message encoded in the QR code.

QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q);

**Generate QR code: **The next step is to create the QR-code using the data initialized above.

QRCode qrCode = new QRCode(qrCodeData);

**Create a graphical image: **Finally, represent the QR code into a graphical image, as shown below. The

GetGraphicmethod takes one argument, which defines the size of the QR-code. TheGetGraphicmethod return image in the form of Bitmap by default.

Bitmap qrCodeImage = qrCode.GetGraphic(20);

How to return QR-code Image from .Net Core API response?

Controller GET route snippet uses the QR-code library and returns the QR code image as a response.

[HttpGet]
[Route("qenerate/{qrText}")]
public IActionResult GetQrCode(string qrText)
{
	QRCodeGenerator qrGenerator = new QRCodeGenerator();
	QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q);
	QRCode qrCode = new QRCode(qrCodeData);
	Bitmap qrCodeImage = qrCode.GetGraphic(20);
	return File(BitmapToBytes(qrCodeImage), "image/jpeg");
}

**Bitmap to bytes function code snippet: **QR-code, by default, generates a Bitmap, below function used to convert Bitmap to bytes.

private static Byte[] BitmapToBytes(Bitmap img)
{
	using (MemoryStream stream = new MemoryStream())
	{
		img.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
		return stream.ToArray();
	}
}

**Optional parameters & overloads: **Example of QR-code with my publication “The Tech Masters” logo

//Set color by using Color-class types
Bitmap qrCodeImage = qrCode.GetGraphic(20, Color.DarkRed, Color.PaleGreen, true);
//Set color by using HTML hex color notation
Bitmap qrCodeImage = qrCode.GetGraphic(20, "#000ff0", "#0ff000");
//Set logo in center of QR-code
Bitmap qrCodeImage = qrCode.GetGraphic(20, Color.Black, Color.White, (Bitmap)Bitmap.FromFile("C:\\myimage.png"));

#csharp #dotnet #qr-codes #qr-code-api #aspnet #c-sharp #net-core

Tyrique Littel

1604008800

Static Code Analysis: What It Is? How to Use It?

Static code analysis refers to the technique of approximating the runtime behavior of a program. In other words, it is the process of predicting the output of a program without actually executing it.

Lately, however, the term “Static Code Analysis” is more commonly used to refer to one of the applications of this technique rather than the technique itself — program comprehension — understanding the program and detecting issues in it (anything from syntax errors to type mismatches, performance hogs likely bugs, security loopholes, etc.). This is the usage we’d be referring to throughout this post.

“The refinement of techniques for the prompt discovery of error serves as well as any other as a hallmark of what we mean by science.”

J. Robert Oppenheimer

Outline

We cover a lot of ground in this post. The aim is to build an understanding of static code analysis and to equip you with the basic theory, and the right tools so that you can write analyzers on your own.

We start our journey with laying down the essential parts of the pipeline which a compiler follows to understand what a piece of code does. We learn where to tap points in this pipeline to plug in our analyzers and extract meaningful information. In the latter half, we get our feet wet, and write four such static analyzers, completely from scratch, in Python.

Note that although the ideas here are discussed in light of Python, static code analyzers across all programming languages are carved out along similar lines. We chose Python because of the availability of an easy to use ast module, and wide adoption of the language itself.

How does it all work?

Before a computer can finally “understand” and execute a piece of code, it goes through a series of complicated transformations:

static analysis workflow

As you can see in the diagram (go ahead, zoom it!), the static analyzers feed on the output of these stages. To be able to better understand the static analysis techniques, let’s look at each of these steps in some more detail:

Scanning

The first thing that a compiler does when trying to understand a piece of code is to break it down into smaller chunks, also known as tokens. Tokens are akin to what words are in a language.

A token might consist of either a single character, like (, or literals (like integers, strings, e.g., 7, Bob, etc.), or reserved keywords of that language (e.g, def in Python). Characters which do not contribute towards the semantics of a program, like trailing whitespace, comments, etc. are often discarded by the scanner.

Python provides the tokenize module in its standard library to let you play around with tokens:

Python

1

import io

2

import tokenize

3

4

code = b"color = input('Enter your favourite color: ')"

5

6

for token in tokenize.tokenize(io.BytesIO(code).readline):

7

    print(token)

Python

1

TokenInfo(type=62 (ENCODING),  string='utf-8')

2

TokenInfo(type=1  (NAME),      string='color')

3

TokenInfo(type=54 (OP),        string='=')

4

TokenInfo(type=1  (NAME),      string='input')

5

TokenInfo(type=54 (OP),        string='(')

6

TokenInfo(type=3  (STRING),    string="'Enter your favourite color: '")

7

TokenInfo(type=54 (OP),        string=')')

8

TokenInfo(type=4  (NEWLINE),   string='')

9

TokenInfo(type=0  (ENDMARKER), string='')

(Note that for the sake of readability, I’ve omitted a few columns from the result above — metadata like starting index, ending index, a copy of the line on which a token occurs, etc.)

#code quality #code review #static analysis #static code analysis #code analysis #static analysis tools #code review tips #static code analyzer #static code analysis tool #static analyzer

Ortez Infotech

1619071142

Contactless QR Code Restaurant Menu | E-Menu System Dubai

Ortez E-Menu offers far more than a standard menu of your restaurant. We help you to get more orders with less mistakes within a short span of time!

Keep in touch with us👇🏻
🌎 restaurant qr code menu dubai
📲 91 94477 34981/ 91484 2428141

#menucard #menu #restaurant #menudesign #graphicdesign #branding #restaurantmenu #food #design #graphicdesigner #logo #marketing #branddesign #logodesign #menucarddesign #posterdesign #digitalmenu #imenu #advertising #finedinemenu #restaurantbusiness #men #mobilemenu #emenu #brochuredesign #restaurants #menucards #art #menuplanning #qrcode

#qr code menu dubai #e-menu dubai #qr menu dubai #restaurant qr code menu dubai #qr code restaurant dubai

I am Developer

1597817005

Bar Code Generator In Laravel 7.x

Bar Code Generate in Laravel 7, 6. In this post, i will show you simple and easy steps to generate bar/qr code in laravel.

Generate Bar codes in Laravel

Use the below given steps and generate bAR/QR codes in laravel Projects:

Install Laravel Fresh Setup
Set database Credentials In .env File
Install simple-QRcode Package
Register Package
Test Qr Code
Conclusion

https://www.tutsmake.com/laravel-6-simple-generate-or-create-qr-codes-example/

#laravel 7 bar code generator #barcode generator laravel 7 #barcode generator laravel 6 #laravel 7 qr code generator #laravel simple/barcode example

Nick FrankCold

1601689134

How to Generate QR Code using PHP, QR Code generator

QR code is just a conventional two dimensional barcode or a matrix barcode which is using for a quick response or to retrieve small piece of data by scanning the QR image from your phone or any QR scanner.

These days, several recent applications are using QR code to store minimal amount of data. It is generating using black square boxes which is organize in white box and can be read from any imaging device or any scanner application. you can also read our tutorial on autocomplete search in PHP.

QR code abbreviated as (Quick Response code) is first design for automotive industry in Japan in early 1994. It is a machine readable code that persist of small amount of data which can be scanned and read it easily.

In this article, I will explain you to easily create QR code in any PHP application. Please follow the below steps to integrate it. You can view the demo and download the complete working scripts from our repository.

#php #generate #qr code