A summary of the specification is here: * http://en.wikipedia.org/wiki/QR_code Numeric only Max. 7,089 characters (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) Alphanumeric Max. 4,296 characters (0–9, A–Z [upper-case only], space, $, %, *, +, -, ., /, 🙂 Binary/byte Max. 2,953 characters (8-bit bytes) (23624 bits) Kanji/Kana Max. 1,817 characters The specification … Read more
I wrote a simple GPLv3 qr encoder in javascript that is local, uses HTML5 and is really fast as it is a port of an embedded C version I wrote for Atmel AVR processors. http://code.google.com/p/jsqrencode/downloads/list There is a live version (which is saveable as a webapp on iOS devices) at http://zdez.org/qrenc3.html (save to home, opens … Read more
There aren’t many JavaScript decoders. There is one at http://www.webqr.com/index.html The easiest way is to run ZXing or similar on your server. You can then POST the image and get the decoded result back in the response.
try { Intent intent = new Intent(“com.google.zxing.client.android.SCAN”); intent.putExtra(“SCAN_MODE”, “QR_CODE_MODE”); // “PRODUCT_MODE for bar codes startActivityForResult(intent, 0); } catch (Exception e) { Uri marketUri = Uri.parse(“market://details?id=com.google.zxing.client.android”); Intent marketIntent = new Intent(Intent.ACTION_VIEW,marketUri); startActivity(marketIntent); } and in onActivityResult(): @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 0) { if (resultCode … Read more
Take a look QRCoder – pure C# open source QR code generator. Can be used in three lines of code QRCodeGenerator qrGenerator = new QRCodeGenerator(); QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(textBoxQRCode.Text, QRCodeGenerator.ECCLevel.Q); pictureBoxQRCode.BackgroundImage = qrCode.GetGraphic(20);
QR codes have three parameters: Datatype, size (number of ‘pixels’) and error correction level. How much information can be stored there also depends on these parameters. For example the lower the error correction level, the more information that can be stored, but the harder the code is to recognize for readers. The maximum size and … Read more
with zxing this is my code for create QR QRCodeWriter writer = new QRCodeWriter(); try { BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, 512, 512); int width = bitMatrix.getWidth(); int height = bitMatrix.getHeight(); Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); for (int x = 0; x < width; x++) { for (int y = 0; y < height; … Read more
You can try the following steps and code using qrtools: Create a qrcode file, if not already existing I used pyqrcode for doing this, which can be installed using pip install pyqrcode And then use the code: >>> import pyqrcode >>> qr = pyqrcode.create(“HORN O.K. PLEASE.”) >>> qr.png(“horn.png”, scale=6) Decode an existing qrcode file using … Read more
It’s worth adding that, in addition to the QR codes library posted by @abaumg, Google provides a QR Codes API QR Codes APImany thanks to @Toukakoukan for the link update. To use this , basically: https://chart.googleapis.com/chart?chs=300×300&cht=qr&chl=http%3A%2F%2Fwww.google.com%2F&choe=UTF-8 300×300 is the size of the QR image you want to generate, the chl is the url-encoded string you … Read more