Oracle9i Java Developers Guide (Part No. A90209-01) - by Maring S

By Maring S

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Objektorientierte Programmiersprache C++: Vollständige Einführung anhand von Beispielen (VDI-Buch) (German Edition)

In diesem Werk werden alle Aspekte der Sprache C++ behandelt, deshalb ist das Buch ebenso für Einsteiger, mit oder ohne Vorkenntnisse über eine andere Programmiersprache, als auch für Umsteiger von anderen Programmiersprachen bzw. C-Programmierer geeignet. Die Darstellung der Sachverhalte erfolgt knapp und systematisch, die Beispiele sind kurz, prägnant und compiler- unabhängig und auf allen Rechnern mit C++ 2.

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A mobile phone needs to react to an incoming call or SMS, which would not happen if it were fully turned off; the system should be able to respond by changing from low-power to active mode. Even if all power is removed suddenly, the system should do what it can to save critical information, so that there is a possibility of a warm boot rather than a cold boot when power returns. As an application or server programmer, your task is easier than that of the kernel-side programmer, but you still have to be aware of power management issues.

E32Main() returns a TInt integer. We could have used int instead of TInt, but since C++ compilers don’t guarantee that int is a 32-bit signed integer, Symbian OS uses typedefs for standard types to guarantee they are the same across all Symbian OS implementations and compilers. E32Main() sets up the error-handling framework. It sets up a cleanup stack and then calls ConsoleMainL() under a trap harness. The trap harness catches errors – more precisely, it catches any functions that leave. If you’re familiar with exception handling in standard C++ or Java, TRAP() is like try and catch all in one, User::Leave() is like throw, and a function with L at the end of its name is like a function with throws in its prototype.

Although they can be defined in any Symbian OS application, shortcut keys are clearly not usable on mobile phones without keyboards (except when the application is running on the emulator) so neither the UIQ nor the S60 user interfaces display shortcut key information in their menus. 2 Hello World – Text Version Now that you’ve started to get to grips with the emulator, it’s time to get your first Symbian OS C++ program running. ’ to a text console. That will introduce you to the tools required for building applications for both the emulator and a real device, so that later on you’ll be ready for a program with a GUI.

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