S60 Programming: A Tutorial Guide (Symbian Press) by Paul Coulton;Reuben Charles Edwards

By Paul Coulton;Reuben Charles Edwards

According to the authors' stories in constructing and instructing Symbian OS, this functional advisor is ideal for programmers and offers a sequence of example-based situations that exhibit the right way to advance Symbian purposes.

  • routines stroll the reader throughout the preliminary improvement of a console-based card video game engine to a graphical consumer interface(GUI)-based, participant blackjack online game working over a Bluetooth connection among cell phones
  • Addresses how Symbian deals a few assorted editions to permit for various consumer interfaces and monitor savers - the main widespread of those is S60
  • Discusses how the stream towards 3G know-how has led to an expanding desire for cellular software improvement for S60 units.

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Additional info for S60 Programming: A Tutorial Guide (Symbian Press)

Example text

While Symbian OS does allow the use of floating-point arithmetic within an application, developers should be aware that it is much less efficient in terms of application speed and power usage than using fixed-point arithmetic. The memory of S60 mobile phones is generally limited to a few megabytes for applications and about a megabyte of heap memory (the memory available for applications to use while in operation). However, if you are intending to deliver your applications over the air (OTA), you should check the size allowed by operators; on average, it is currently only in the region of 64 KB.

As programmers, we are able to handle events that may cause a leave by using trap harnesses (see Chapter 3). However, knowing which particular functions may leave is useful to a programmer and you should always append the letter ‘L’ to a function name if its actions may cause a leave. void FunctionMayLeaveL() The suffix ‘C’ indicates that the function will return a pointer that has been pushed onto the cleanup stack. The cleanup stack is used to store pointers that may become orphaned so that if a leave occurs, cleanup can still be carried out.

However, phones may be left on for weeks at a time between reboots and so leaked resources may not be reclaimed for long periods of time, impacting the amount of memory available in the system. The Cleanup Stack The cleanup stack provides a mechanism for saving pointers that may be orphaned in the event of a leave (we will look at this in more detail later in our examples). Pointers are pushed onto the stack using the PushL() function. In the event of a Leave, each of the items on the cleanup stack is freed up either by calling delete, in the case of CBase-derived classes, or by calling the static function User::Free(), in the case of untyped objects.

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