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The existing view() method correctly displays a page but currently raises an error if you try to display a page that doesn t exist. This is because page_q.get() returns None when the page doesn't exist so that c.page is set to None. This causes an exception in the template when c.page.title is accessed. Also, if a URL cannot be found, the HTTP specification says that a 404 page should be returned. You can use the abort() function to immediately stop the request and trigger the Pylons error documents middleware to display a 404 Not Found page. You should also display a 404 page if the user doesn t specify a page ID. Here s what the updated code looks like. Notice that the action arguments have been changed so that id is now optional. def view(self, id=None): if id is None: abort(404) page_q = meta.Session.query(model.Page) c.page = page_q.get(int(id)) if c.page is None: abort(404) return render('/derived/page/view.html') qr code generator using javascript Generate QR Code in java using zxing | CalliCoder
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QRCode . js has no dependencies. Basic Usages. <div id=" qrcode "></div> <script type="text/ javascript "> new QRCode (document.getElementById(" qrcode "), "http://jindo.dev.naver.com/collie"); </script> Sample Code . HTML. Browser Compatibility. License. Contact. Listing 11-8. Determining whether you are willing to read the file bool TextImageHandler::read( QImage *image ) { QTextStream stream( device() ); QString line; line = stream.readLine(); if( line != "TEXT" || stream.status() != QTextStream::Ok ) return false; line = stream.readLine(); QRegExp re( "(\\d+)x(\\d+)" ); int width, height; if( re.exactMatch( line ) ) { bool ok; width = re.cap(1).toInt( &ok ); if( !ok ) return false; height = re.cap(2).toInt( &ok ); if( !ok ) return false; } else return false; ... } Because the header is valid, you can see the second half of the read method (the source code is shown in Listing 11-9). The reading is very similar to the writing. First, a temporary QImage is created; then each line is read and converted to gray scale. The length of each line is checked against the expected image width, and no unexpected characters in the image data are accepted. If the status of the stream is okay when the entire image has been read, the image given as an argument is updated before true is returned to indicate a successful read. Listing 11-9. Read the image from the device and determine whether it all went well. bool TextImageHandler::read( QImage *image ) { ... QImage result( width, height, QImage::Format_ARGB32 ); for( int y=0; y<height; ++y ) { asp.net barcode control, asp.net gs1 128, rdlc data matrix, .net code 39 reader, crystal reports upc-a, asp.net ean 13 java qr code reader example Java QR Code Reader Library to read, scan QR Code barcode ...
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20 Jun 2017 ... Learn how to read QR code images in Java using google's zxing library. When you are testing a condition that involves None in Python, you should use the is operator rather than the == operator. line = stream.readLine(); if( line.length() != width ) return false; for( int x=0; x<width; ++x ) { switch( QString(map).indexOf(line[x]) { case 0: result.setPixel( x, y, 0xffffffff break; case 1: result.setPixel( x, y, 0xffdfdfdf break; case 2: result.setPixel( x, y, 0xffbfbfbf break; case 3: result.setPixel( x, y, 0xff9f9f9f break; case 4: result.setPixel( x, y, 0xff7f7f7f break; case 5: result.setPixel( x, y, 0xff5f5f5f break; case 6: result.setPixel( x, y, 0xff3f3f3f break; case 7: result.setPixel( x, y, 0xff000000 break; default: return false; } } } if( stream.status() != QTextStream::Ok ) return false; *image = result; return true; } new() In the server-authenticated-only case, the client sends a ClientKeyExchange message to the server after receiving the server s certificate. java qr code scanner download QR code scanner for Java - Opera Mobile Store
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