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Oct 24, 2010 · The ZXing barcode app for those platforms does a great job of ... That said, scanning QR Codes with Java apps has, by and large, been an ...

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SQLAlchemy is a well-designed package, and although it isn t ever going to be as fast as using the DB-API 20 directly, it should perform extremely well as long as you use it correctly One thing you should avoid at all costs is writing a query like this: for page in sessionquery(modelPage): if pageid == 1: print pagetitle This would select every page from the database and create a new page object from the Page class for each row in the table, just so that you can find the page with an id of 1 Since there is only one page in the database, this code isn t too bad, but if you had 10,000 pages, that is 10,000 objects that need to be created and checked in Python rather than in the underlying RDBMS.

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Generate QR Code image from Java Program | Java Code Geeks ...
18 Oct 2012 ... This is very popular in mobile apps, where you scan the QR code ... Here is the program you can use to create QR Code image with zxing API.

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if( filenameisEmpty() ) return false; return saveFile( filename ); } The fileSave method tries to save the document to the same file as before the name kept in currentFilename If the current file name is empty, the file has not been given a file name yet In this case, the fileSaveAs method is called, showing the user a File dialog to pick a file name It is shown as source code in Listing 8-25 The fileSave method returns the return value from either saveFile or fileSaveAs, depending on which method is used to save the file Listing 8-25 Source code for the Save action bool SdiWindow::fileSave() { if( currentFilename.

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How to generate QR code with logo inside it? - Stack Overflow
You can add your logo it as an Image Overlay like public BufferedImage getQRCodeWithOverlay(BufferedImage qrcode ) { BufferedImage scaledOverlay ...

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How to Create QRCode Using QRGen in Java | Java Code Geeks ...
26 Apr 2019 ... Interested to learn about QRCode ? Check our article explaining how to use QRGen library to generate QR code images in java .

As mentioned in Section 14.1, don t forget to use different keys for encryption and MACs. For instance, if the same key that is used for AES CBC encryption is also used to compute an AES CBC MAC, an adversary would be able to modify an entire message up to the last block without detection. It would be advisable to call in a security expert for help and advice prior to deciding which MAC algorithms to use, and to have your code reviewed to make sure you are not doing anything dangerous.

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Iterating over results as Python objects is obviously a very inefficient way of searching through data in a table, because each row has to be loaded into memory as a Python object SQL databases are designed to be very fast at performing complex queries, so it is much better to use one of SQLAlchemy s filter methods to generate the SQL necessary to make the underlying database do all the hard work, or in this case, you can just use the get() method you saw earlier, which might not even have to contact the database if the page is already in memory in the session: page = sessionquery(modelPage)get(1) The final thing to remember is that the Object-Relational API isn t always the best tool for the job.

isEmpty() ) return fileSaveAs(); else return saveFile( currentFilename ); } The final option needed to make the dialog behave as expected is to let the user save the file from the warning dialog shown when a modified document is being closed The new implementation of the isSafeToClose method is shown in Listing 8-26, in which the lines containing the actual changes are highlighted The first change is the addition of the Save option to the warning dialog using the QMessageBox::Save enumerated value The other change consists of a case for handling the Save button If the button is pressed, a call is made to fileSave If the file is not saved (that is, false is returned), the close event is aborted This makes it impossible for the user to lose a document without actually having chosen to do so (or experiencing some sort of power failure) Listing 8-26.

If you are updating or deleting multiple rows at once, for example, you are much better off using the SQL Expression API to allow SQLAlchemy to build a SQL statement that the underlying RDBMS can use to change the rows using its efficient C code Remember that you can always mix and match the Object-Relational API code and the SQL Expression API code within the same.

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Java : Simple QR Code Generator Example - Now you Could have ...
17 Jul 2017 ... ZXING is a Multi-format 1D/2D barcode image processing library with clients for Android, Java . It is an open - source , multi-format 1D/2D barcode  ...

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