By Jasmin Blanchette
The one legitimate, Best-Practice advisor to Qt 4.3 ProgrammingUsing Trolltech's Qt you could construct industrial-strength C++ purposes that run natively on home windows, Linux/Unix, Mac OS X, and embedded Linux with no resource code alterations. Now, Trolltech insiders have written a start-to-finish consultant to getting impressive effects with the newest model of Qt: Qt 4.3. choked with sensible examples and in-depth recommendation, this is often the e-book Trolltech makes use of to coach Qt to its personal new hires. greatly revised and multiplied, it finds state-of-the-art top Qt programming styles for every thing from imposing model/view structure to utilizing Qt 4.3's more suitable photographs help. you will find confirmed recommendations for almost each GUI improvement activity, in addition to subtle ideas for supplying database entry, integrating XML, utilizing subclassing, composition, and extra. even if you are new to Qt or upgrading from an older model, this booklet may also help accomplish every little thing that Qt 4.3 makes attainable. thoroughly up-to-date all through, with major new assurance of databases, XML, and Qtopia embedded programmingCovers all Qt 4.2/4.3 adjustments, together with home windows Vista aid, local CSS help for widget styling, and SVG dossier generationContains separate second and 3D chapters, assurance of Qt 4.3's new snap shots view periods, and an advent to QPainter's OpenGL back-endIncludes new chapters on look-and-feel customization and alertness scriptingIllustrates Qt 4's model/view structure, plugin help, format administration, occasion processing, box sessions, and masses morePresents complicated innovations coated in no different book—from developing plugins to interfacing with local APIsIncludes a brand new appendix on Qt Jambi, the recent Java model of Qt
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Extra info for C++ GUI Programming with Qt4 (Second Edition)
At the end of the year, Haavard suggested that they go into business together to build "the world's best C++ GUI framework". The year 1994 began inauspiciously with the two young programmers wanting to enter a well-established market, with no customers, an unfinished product, and no money. Fortunately, their wives were employed and therefore able to support their husbands for the two years Eirik and Haavard expected to need to develop the product and start earning an income. The letter 'Q' was chosen as the class prefix because the letter looked beautiful in Haavard's Emacs font.
The code generated by moc includes this header file and adds some C++ boilerplate code of its own. Classes that use the Q_OBJECT macro must have moc run on them. This isn't a problem because qmake automatically adds the necessary rules to the makefile. But if you forget to regenerate your makefile using qmake and moc isn't run, the linker will complain that some functions are declared but not implemented. The messages can be fairly obscure. obj : error LNK2001: unresolved external symbol "public:~virtual int __thiscall MyClass::qt_metacall(enum QMetaObject ::Call,int,void * *)" If this ever happens to you, run qmake again to update the makefile, then rebuild the application.
For moc to work correctly, we must put the class definition in a header file, separate from the implementation file. The code generated by moc includes this header file and adds some C++ boilerplate code of its own. Classes that use the Q_OBJECT macro must have moc run on them. This isn't a problem because qmake automatically adds the necessary rules to the makefile. But if you forget to regenerate your makefile using qmake and moc isn't run, the linker will complain that some functions are declared but not implemented.