qr-code

问题 I use ZXing.Net library to generate a QR code image - At the top of my class: [System.Runtime.InteropServices.DllImport("gdi32.dll")] public static extern bool DeleteObject(IntPtr hObject); My method: protected void UpdateQRSource(String address) { QRCodeWriter qrcode = new QRCodeWriter(); BarcodeWriter barcodeWriter = new BarcodeWriter { Format = BarcodeFormat.QR_CODE, Options = new EncodingOptions { Width = 300, Height = 300, Margin = 4 } }; using (Bitmap bitmap = barcodeWriter.Write

问题 I'm working on a project using Python(3.7) and OpenCV in which I have an Image(captured using the camera) of a document with a QR code placed on it. This QR code has 6 variables respectively as: Size of QR code image Top Right Bottom Left Unit Latest Update: Here are the steps I need to perform in the same order: Detect the qr code & decode it to read size values So, if the size of QR-code(image) is not equal to the size which is mentioned inside it then scale the image to equal both size

问题 I have imagedata in base64 format returned from Expo ImagePicker component, and I want to convert it to An Uint8ClampedArray of RGBA pixel values in the form [r0, g0, b0, a0, r1, g1, b1, a1, ...], cause it's the only input accepted by jsQR library I tried this, but did not work: const dataURItoBlob = byteString => { // write the bytes of the string to a typed array var ia = new Uint8ClampedArray(byteString.length); for (var i = 0; i < byteString.length; i++) { ia[i] = byteString.charCodeAt(i)

问题 I have imagedata in base64 format returned from Expo ImagePicker component, and I want to convert it to An Uint8ClampedArray of RGBA pixel values in the form [r0, g0, b0, a0, r1, g1, b1, a1, ...], cause it's the only input accepted by jsQR library I tried this, but did not work: const dataURItoBlob = byteString => { // write the bytes of the string to a typed array var ia = new Uint8ClampedArray(byteString.length); for (var i = 0; i < byteString.length; i++) { ia[i] = byteString.charCodeAt(i)

问题 I wonder how Bar Code and QR Code (even character) are recognized without capturing it.I have seen in many app, when we keep our device above any of these (QR/Bar Code), the app automatically recognize it and starts processing. Is there any scanning mechanism used for this? How this can be achieved? What are mechanism involving in this? Thanks in advance. 回答1: 1) The phone camera will be launched by the library it will autofocus and scans until it finds the decoded info from the image

问题 I have this code which outputs a QR code: <?php include(JPATH_LIBRARIES . '/phpqrcode/qrlib.php'); $db = JFactory::getDbo(); $user = JFactory::getUser(); $query = $db->getQuery(true); $query->select($db->quoteName(array('Soci', 'Nom', 'Cognoms', 'eCorreu'))) ->from($db->quoteName('#__rsform_socis')) ->where($db->quoteName('username') . ' = '. $db->quote($user->username)); $db->setQuery($query); $codeContents = $db->loadObjectList(); $data .= "Soci Nº: {$codeContents[0]->Soci}\n "; $data .=

问题 I have a simple question about generating QR codes with google-spreadhseet. I am using google's API call =image("https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl="&A3) This works fine. Where A3 is a persons first name. I have their last name in A4 but when I try: =image("https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl="&(A3+A4)) or =image("https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl="& (CONCATENATE(A3, " ", A4))) The QR box is blank. How can I generate a QR

问题 I am developing one android sample application as an academic project where I need to scan QR code, I used QR scan code library and I am able to detect QR code successfully if on screen there is only one QR code. Right I want to scan QR code although same QR code showing at multiple places on screen at a time. For an example, On my laptop screen QR code image looks like below mentioned images.All QR codes are same, there is no difference between them. Consider below images which are having 6

问题 I am developing one android sample application as an academic project where I need to scan QR code, I used QR scan code library and I am able to detect QR code successfully if on screen there is only one QR code. Right I want to scan QR code although same QR code showing at multiple places on screen at a time. For an example, On my laptop screen QR code image looks like below mentioned images.All QR codes are same, there is no difference between them. Consider below images which are having 6

问题 I am trying to generate a QR code that has a logo in the middle, as it is: . I am using a code I found here, my code is: func generateQrCode(message: String!) -> CIImage! { var data = message.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) var filter: CIFilter = CIFilter(name: "CIQRCodeGenerator") filter.setValue(data, forKey: "inputMessage") filter.setValue("H", forKey: "inputCorrectionLevel") return filter.outputImage } How could adapt the code to generate a QR with a