By Mark Summerfield
Master Qt's strongest APIs, styles, and improvement Practices
Qt has developed right into a remarkably strong answer for cross-platform laptop, internet, and cellular improvement. besides the fact that, even the main skilled Qt programmers simply use a fragment of its features. additionally, sensible information regarding Qt's most up-to-date positive aspects has been scarce—until now.
Advanced Qt Programming exhibits builders precisely find out how to take complete good thing about Qt 4.5's and Qt 4.6's Most worthy new APIs, software styles, and improvement practices. Authored via Qt specialist Mark Summerfield, this ebook concentrates on strategies that supply the main strength and suppleness with the least extra complexity.
Summerfield focuses particularly on model/view and graphics/view programming, hybrid desktop/Web functions, threading, and functions incorporating media and wealthy textual content. all through, he provides reasonable, downloadable code examples, all verified on home windows, Mac OS X, and Linux utilizing Qt 4.6 (and so much demonstrated on Qt 4.5) and designed to count on destiny models of Qt. The book
Walks via utilizing Qt with WebKit to create cutting edge hybrid desktop/Internet applications
Shows the right way to use the Phonon framework to construct robust multimedia applications
Presents cutting-edge thoughts for utilizing model/view desk and tree versions, QStandardItemModels, delegates, and perspectives, and for developing customized desk and tree types, delegates, and views
Explains the right way to write more desirable threaded courses with the QtConcurrent module and with the QThread class
Includes distinct insurance of constructing wealthy textual content editors and documents
Thoroughly covers graphics/view programming: structure, home windows, widgets, layouts, scenes, and more
Introduces Qt 4.6's robust animation and kingdom desktop frameworks
Read Online or Download Advanced Qt Programming: Creating Great Software with C++ and Qt 4 PDF
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Additional info for Advanced Qt Programming: Creating Great Software with C++ and Qt 4
Windows and many device drivers cooperate to ensure that large I / O latencies do not severely impact program performance. Using these capabilities requires that you rewrite code to deal with concurrent orchestration of events. Some problems are more naturally modeled using concurrency. Games, AI, and scientific simulations often need to model interac tions among many agents that operate mostly independently of one another, much like objects in the real world. These interactions are inherently concurrent.
Then both copied their new values back into the shared memory without any validation or synchronization that would pre vent one from overwriting the other's value. Both threads calculate the value 1 in their private registers, without knowledge of each other, and, in this particular case, tl just overwrites t2' s earlier write of 1 to the shared location with the same value. One might question how likely this is to occur. (Note that the likelihood matters very little. The mere fact that it can occur means that it is a very serious bug.
T1 t l ( 0 ) : MOV EAX , [ a ] t 1 ( 1 ) : INC , EAX t l ( 2 ) : MOV [ a ] , EAX t2 t 2 ( 0 ) : MOV EAX , [ a ] t 2 ( 1 ) : INC , EAX t 2 ( 2 ) : MOV [ a ] , EAX t3 t 3 ( 0 ) : MOV EAX , [ a ] t 3 ( 1 ) : INC , EAX t 3 ( 2 ) : MOV [ a ] , EAX Each thread is running on a separate processor. Of course, this means that each processor has its own private EAX register, but all threads see the same value in a and therefore access the same shared memory. This is where time becomes a very useful tool for explaining the behavior of our concurrent programs.
Advanced Qt Programming: Creating Great Software with C++ and Qt 4 by Mark Summerfield