NOTE: If you want to change the QR code's matrix, experiment with setting maskPattern to either a value from 1 to 7, or QRCode::MASK_PATTERN_AUTO when initializing LogoOptions. To do that, reload in your browser, and you should see it rendered similarly to the screenshot below. With the code and image in place, let's generate the new version of the QR code and see what it looks like. If you choose to use a different image, make sure that you save the image in public/img and pass the image's path as the second argument to $qrOutputInterface->dump().
#QR CODE WITH TEXT BELOW PROTOCOL DOWNLOAD#
To download it, first open it in Twilio's Library, then click the " Actual size_PNG" link on the lower right-hand side of the page. For the purposes of this article, I'm using Twilio's logo. The last thing we need to do before testing the changes is to choose the image that we're going to overlay on the QR code. The code finishes up by calling $qrOutputInterface's dump method to overlay the image over the QR code and return a Base64-encoded string representation of the QR code.
#QR CODE WITH TEXT BELOW PROTOCOL HOW TO#
$options and a new QRMatrix object are passed to QRImageWithLogo's constructor, so that it knows how to generate the QR code and the data to store in it. We've also set eccLevel to ECC_H to allow us to overlay a logo on the QR code, and set version to 7 to allow for a higher level of error correction, required because of the increased level of data in the QR code.Īfter that, we initialize $qrOutputInterface as a new QRImageWithLogo instance, which handles generating a QR code and overlaying the specified image on it using PHP's GD extension. The higher the value, the higher the QR code's quality.
imageBase64: This determines if the QR code will be rendered as binary data or a Base64-encoded string.G.In addition to these two, this code sets two others: Int deltaWidth = bm.Width - overlay.Width Int deltaHeigth = bm.Height - overlay.Height Var encOptions = new Į(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H) Public Bitmap GenerateQR(int width, int height, string text) PictureBox1.Image = GenerateQR(size, size, url) Ĭonsole.WriteLine(checkQR(new Bitmap(pictureBox1.Image)))
Private string imagePath = string url = int size = 400 Here we go (you can use any logo): using Please advise me how to add short text string or a custom image in the middle of the QR code - similar to the Wikipedia visual QR code below:Įmbedding custom logo in QR code (without breaking the latter!) seems to be not a trivial task as the scientific publication QR Images: Optimized Image Embedding in QR Codes shows.īut I still wonder if I could generate a QR code (as in the above source code), then overlay it with a custom text or logo, then validate the resulting image again by ZXing.Net. QrImage.Source = source // set WPF image source
Using (Bitmap bitmap = barcodeWriter.Write(address))īitmapSource source = Imaging.CreateBitmapSourceFromHBitmap( QRCodeWriter qrcode = new QRCodeWriter() īarcodeWriter barcodeWriter = new BarcodeWriter My method: protected void UpdateQRSource(String address) Public static extern bool DeleteObject(IntPtr hObject) I use ZXing.Net library to generate a QR code image -Īt the top of my class:
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