TAndRClasses: typical ‘T’ and ‘R’ type classes

TAndRClasses shows a typical ‘T’ class and a typical ‘R’ class.

The ‘T’ type is a value type, owning no external object.

The ‘R’ type is a resource type; typically this is proxy for an object owned elsewhere. In practice, the 'R' type is a handle to a resource owned and managed by the Kernel.

In this example, the ‘R’ class derives from the standard Symbian OS handle class RTimer.

The source code for this example application can be found in the directory:

examples\Basics\TAndRClasses

It may be in the directory in which you installed Symbian OS, or it may be in src\common\developerlibrary\. It includes the two project files needed for building: bld.inf and the .mmp file.

The Symbian OS build process describes how to build this application, which results in an executable called:

\epoc32\release\<target>\<urel or udeb>\TANDRCLASSES.EXE.

Run the executable TANDRCLASSES.EXE.

Executables for the emulator targets wins and winscw can be run on your PC. Executables for ARM targets must be copied to your target platform before being run.

• RTimer: asynchronous timer service

• TCleanupItem: general cleanup item

• CleanupStack: a cleanup stack

• TRequestStatus: asynchronous request status