.NET/Java PDF, Tiff, Barcode SDK Library

<binding dataContext="dataSource" dataPath="isReady" property="enabled"/> </bindings> <click> <invokeMethod target="dataSource" method="select" /> </click> </button> Finally, you want to specify what should happen when the page first loads. This application performs a simple action in this circumstance, and that is to do a select against the data source to generate a new dataset and trigger all the bindings, initializing the UI. <application> <load> <invokeMethod target="dataSource" method="select"/> </load> </application>

} }

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The application is split into two major parts: the user interface class and the database interface class. The user interface uses the database interface to access the classes from the QtSql module. The user interface is contained in the ImageDialog class, and the database interface is found in the ImageCollection class. By splitting the code that uses SQL into a specific class, you avoid having SQL strings throughout the source code. There are several reasons to split the code containing SQL from the rest of the code. First of all, that part of the code can be tested in detail, which is important since any syntax errors in the SQL statements are detected first at run-time. It is convenient to convert between the types used in the database and Qt s classes in one place. And when you change database engines, it might be necessary to review and update some of the SQL statements used.

Console.Write(" ");

Console.ReadKey();

And our output is:

(Just to prove that you do get values bigger than 0xFF in Unicode!)

Slots can be public, protected, or private These sections are labeled as public slots:, protected slots:, or private slots: Signals are signal prototypes and are placed after the signals: label Slots are implemented as any other member function, although you never implement signals just declare them in the class definition and let the meta-object compiler handle the details When connecting signals and slots, remember that the connect method cannot handle argument values, only argument types The values of the arguments must come from the emitting object When using signals and slots, you must inherit QObject and start the class declaration with the Q_OBJECT macro This adds the required code and tells the meta-object compiler that the class needs a meta-object As soon as you have inherited QObject, you can assign a parent to an object and any number of children.

In the course of the chapters on file I/O ( 11) and networking ( 13), we re going to see a number of communications and storage APIs that deal with writing arrays of bytes to some kind of target device. The byte format in which those strings go down the wires is clearly very important, and, while the framework default choices are often appropriate, knowing how (and why) you might need to choose a different encoding will ensure that you re equipped to deal with mysterious bugs especially when wrangling text in a language other than your own, or to/from a non-Windows platform.

Summary

Summary

In this chapter, we delved into the workings of strings, looking at the difference between the immutable String and its mutable cousin, StringBuilder. We saw how to convert other data types to and from strings, and how to control that formatting, especially when we consider cultures and languages other than our own. We saw the various ways in which we can compose strings, and the performance tradeoffs of each technique. Finally, we looked at how strings are actually represented in memory, and how we may need to convert between different encodings for different applications, platforms, and configurations.

Each parent takes responsibility for calling delete on its children, so as long as you make sure to delete the ancestor to all objects, all objects are deleted Qt has classes for handling the tasks that usually are handled by the C++ standard template library, STL The Qt equivalents are more adapted to be used in combination with Qt, but can interact with their STL equivalents with ease For handling text, use the QString class It supports Unicode and interacts well with the QStringList class The string list class offers methods for search and replace in all strings contained in the list as well as for joining the strings with a delimiter of your choice For keeping lists of any sort of object, Qt has the template classes QList, QLinkedList, and QVector All have pros and cons, but QList is usually the right choice.