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 support enforce a wide number of purposes and providers on Symbian OS. The objective of the e-book is to supply the adventure of Symbian's builders to a much wider viewers and let refined courses to be quick written and to a excessive commonplace. for you to do that, it:
- Provides styles according to the Symbian OS architectural parts
- Describes how styles suited to non-mobile software program will be tailored or perhaps shunned for Symbian OS
- Provides Symbian OS dependent examples and code illustrations
each one bankruptcy covers styles that deal with particular key hindrance skilled via builders: reminiscence functionality, time functionality, energy functionality, defense and responsiveness.
This e-book isn't really particular to any specific model of Symbian OS. whereas person examples might come from one model or one other the styles defined during this booklet are meant to be extra typical and in keeping with 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 at the side of 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 history 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)
Structure This pattern focuses on the concrete places within a software component where you can add lines of code, known as assertions or, more colloquially, as asserts, where a check is performed that the design constraints for your component are being met. It is when an assert fails that the current thread is panicked. We classify asserts into two different types: • External asserts check for the design constraints imposed on how software outside the component interacts with it. An example would be clients of an API provided by the component.
These are only a suggestion, not an immutable rule. You should adapt the implementation to meet your needs, by adding different, extra, or more detailed steps, or, sometimes, by re-ordering the steps. Symbian OS C++ code fragments are given to illustrate a possible implementation. Consequences This section lists the typical positive and negative outcomes resulting from the use of the pattern. Example Resolved The example described in the Problem section of this pattern is resolved in this section using the pattern.
Org/wiki/Assertion(computing) is an article on the general use of assertions when developing software. 12 It is enabled by default but can be changed using User::SetJustInTime() or RProcess::SetJustInTime(). 32 ERROR-HANDLING STRATEGIES Escalate Errors Intent Enhance your error handling by using the Symbian OS Leave mechanism to escalate the responsibility of handling an error up to the point which has enough context to resolve the error. AKA Leave and Trap, Error Propagation, Exception Handling, and Separating Error-Handling Code from ‘Regular’ Code Problem Context Your component is part of or contains a layered software stack13 and has to appropriately handle non-fatal domain or system errors.