By Mark Summerfield
This e-book is geared toward latest C++/Qt programmers and provides principles and concepts which are too complicated or really expert (although now not inevitably difficult), for a primary e-book on Qt.
Qt has now grown to over seven hundred periods and good over 1000000 phrases of documentation, a ways an excessive amount of to hide in one quantity. So rather than masking every little thing very thinly, the booklet makes a speciality of key parts of Qt know-how and attempts to supply extra complete assurance than is on hand elsewhere.
The ebook is totally functional in emphasis, with each approach illustrated through operating code. The examples convey Qt most sensible practices, and feature been established on Linux, Mac OS X, and home windows, utilizing Qt 4.6 and the place attainable (e.g., utilizing #if QT_VERSION), Qt 4.5. (The examples and a pattern bankruptcy will be downloaded from the book's web content. Amazon don't let URLs so google for "qtrac" to discover it.)
The book's major topics are hybrid desktop/Internet functions, threading, wealthy textual content dealing with, Qt's graphics/view structure, and Qt's model/view structure (to which 4 chapters are devoted), even supposing many different subject matters are lined. in addition to every one chapter's major topic, plenty of different periods, equipment, and methods are used at any place they make feel, to teach as many Qt good points as attainable. So even the main skilled Qt programmer should still detect points of Qt they weren't conscious of, realize new innovations, and be encouraged with new ideas.</i>
Read Online or Download Advanced Qt Programming: Creating Great Software with C++ and Qt 4 (Prentice Hall Open Source Software Development Series) PDF
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Additional resources for Advanced Qt Programming: Creating Great Software with C++ and Qt 4 (Prentice Hall Open Source Software Development Series)
We then try to retrieve the icon from the cache using the URL as the key. The QCache::object() method returns 0 if there is no item in the cache with the corresponding key. If we retrieved a QIcon pointer from the cache we use it—in fact we get a copy (which is cheap because Qt uses copy-on-write, and useful since QCache can delete items at any time). Otherwise we use the icon network access manager to download the icon. And if we initiate downloading an icon, the signal–slot connection set up earlier will ensure that the readIcon() slot (covered shortly) is called when the download has ﬁnished.
Otherwise we check to see if the QString scriptOrScriptName private member variable holds an actual script or only the name of a script; and in the latter case we attempt to read in the script’s text. Instead of creating a QTextStream, we open the ﬁle in binary mode and convert the QByteArray returned by the QFile::readAll() method into Unicode using the static QString::fromUtf8() method. Once the script is ready we tell the QWebPage’s main frame to evaluate it, and then we notify any connected objects that we have successfully ﬁnished.