qr-code

问题 I run a simple demo to use cordova-plugin-qrscanner, it can scan qrcode but no camera preview. qrscannerDemo on Github Related code blow: import { Component } from '@angular/core'; import { NavController } from 'ionic-angular'; import { AndroidPermissions } from '@ionic-native/android-permissions'; import { QRScanner, QRScannerStatus } from '@ionic-native/qr-scanner'; @Component({ selector: 'page-home', templateUrl: 'home.html' }) export class HomePage { constructor(public navCtrl:

问题 I am creating a QR Code on the fly and storing it as UIImage. Now I want to be able to send it using the UIActivityViewController but somehow it fails: func generateQRCode(from string: String) -> UIImage? { let data = string.data(using: String.Encoding.ascii) if let filter = CIFilter(name: "CIQRCodeGenerator") { filter.setValue(data, forKey: "inputMessage") let transform = CGAffineTransform(scaleX: 3, y: 3) if let output = filter.outputImage?.applying(transform) { return UIImage(ciImage:

问题 I am creating a QR Code on the fly and storing it as UIImage. Now I want to be able to send it using the UIActivityViewController but somehow it fails: func generateQRCode(from string: String) -> UIImage? { let data = string.data(using: String.Encoding.ascii) if let filter = CIFilter(name: "CIQRCodeGenerator") { filter.setValue(data, forKey: "inputMessage") let transform = CGAffineTransform(scaleX: 3, y: 3) if let output = filter.outputImage?.applying(transform) { return UIImage(ciImage:

问题 Does anyone know of a PHP class which generates QR codes on your server instead of relying on the now deprecated Google Charts API which will not always be in existence. I'm also thinking that bulk QR code generation will be faster if it's done on the server. I would also consider a client based JS or Jquery solution to the problem. 回答1: Theres this one...its for javascript though... http://d-project.googlecode.com/svn/trunk/misc/qrcode/js/ or this....PHP lib http://phpqrcode.sourceforge.net/

问题 How to generate 2-d QR Code for some text and also having an image at centre in android ? I browse a lot but i found only how to generate simple 2-d QR code using ZXing library using this link. Is it possible to generate 2-d QR Code having an image at center using ZXing library ? 回答1: To center-align an image use code like in my activity_main.xml: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width=

问题 I'm printing some QR codes (from a Ruby script) writing ESC/POS commands to a Epson TM-T20 thermal printer. BTW, I'm writing a simple ESC/POS commands printer "driver". The printer I'm using an Epson TM-T20 (USB interface) I'm doing some tests from a Windows 7 host, using serialport gem. All fine about writing ESC/POS commands for print formatted texts and also linear barcodes, but I have problems uinderstanding the command protocol to print QR CODES, using the only available documentation

问题 I'm printing some QR codes (from a Ruby script) writing ESC/POS commands to a Epson TM-T20 thermal printer. BTW, I'm writing a simple ESC/POS commands printer "driver". The printer I'm using an Epson TM-T20 (USB interface) I'm doing some tests from a Windows 7 host, using serialport gem. All fine about writing ESC/POS commands for print formatted texts and also linear barcodes, but I have problems uinderstanding the command protocol to print QR CODES, using the only available documentation

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I wish to dynamically generate QR codes in Java. What is the best QR code generator library to use. I will consider both commercial

问题 Is there any technique used to Login to my website, on my mobile, using a qr code from the PC browser ? (The mobile will capture the QR code from pc then open the website and log the user in ... is there any app to store the user authentications and login directly using the QR code?) 回答1: You should have a look at SQRL from Steve Gibson at GRC: https://www.grc.com/sqrl/sqrl.htm This does exactly what you are looking for and best of all, the crypto has been done right. EDIT: Thanks for your

问题 my current Zxing scanner screen looks like this, I want to add a textview and couple of buttons on it, I had tried many procedures but nothing worked can anyone guide me, I will be humbly looking forward for your kind help here's the Code Java file: private ZXingScannerView mScannerView; @Override public void onCreate(Bundle state) { super.onCreate(state); setContentView(R.layout.activity_qrresult); mScannerView = new ZXingScannerView(this); setContentView(mScannerView); } @Override public