Download Common Design Patterns for Symbian OS: The Foundations of by Adrian J. Issott PDF

By Adrian J. Issott

Universal layout styles for Symbian OS is the 1st layout styles e-book that addresses Symbian OS particularly. It introduces programmers to the typical layout styles that aid enforce a wide number of functions and providers on Symbian OS. The target of the booklet is to supply the adventure of Symbian's builders to a much broader viewers and let refined courses to be fast written and to a excessive ordinary. so as to do that, it:

  • Provides styles in line with the Symbian OS architectural components
  • Describes how styles suited to non-mobile software program might be tailored or perhaps refrained from for Symbian OS
  • Provides Symbian OS established examples and code illustrations

each one bankruptcy covers styles that handle particular key challenge skilled through builders: reminiscence functionality, time functionality, strength functionality, defense and responsiveness.

This publication isn't particular to any specific model of Symbian OS. whereas person examples might come from one model or one other the styles defined during this publication are meant to be extra well-known and in response to the typical performance to be had in all releases. the place attainable the examples given for the layout styles will without delay replicate the software program in Symbian OS.

universal layout styles for Symbian OS is meant for use along with a number of SDKs for particular Symbian OS telephones and with the assets on hand on the Symbian DevNet site. This facility will give you the heritage fabric had to support comprehend the styles and the examples accompanying them.

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Additional resources for Common Design Patterns for Symbian OS: The Foundations of Smartphone Software (Symbian Press)

Sample text

Solution Lower-level components should not try to handle domain or system errors silently unless they have the full context and can do so successfully with no unexpected impact on the layers above. Instead lower layers should detect errors and pass them upwards to the layer that is capable of correctly resolving them. Symbian OS provides direct support for escalating errors upwards known as the leave and trap operations. These allow errors to be propagated up the call stack by a leave and trapped by the layer that has sufficient context to resolve it.

However, there are a number of difficulties with mixing Leave and trap operations with C++ exceptions and so it is not recommended that you use C++ exceptions. 3) revolves around the following two concepts: • The caller is the higher-layer component that makes a function call to another component. This component is aware of the motivation for the function call and hence how to resolve any system or domain errors that might occur. 17 One of the cardinal sins on Symbian OS. 3 Structure of Escalate Errors pattern • The callee is the lower-layer component on which the function call is made.

Symbian OS does not explicitly use the standard C++ exceptionhandling mechanism, for historical reasons. When Symbian OS, or EPOC32 as it was then known, was first established, the compilers available at that time had poor or non-existent support for exceptions. You can use C++ exceptions within code based on Symbian OS. However, there are a number of difficulties with mixing Leave and trap operations with C++ exceptions and so it is not recommended that you use C++ exceptions. 3) revolves around the following two concepts: • The caller is the higher-layer component that makes a function call to another component.

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