examples/Base/ArraysAndLists/linkedlist/deltaque/src/deltaque.cpp

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Description:
Contains the E32Main() function, which executes the example.
The example demonstrates the use of the TDeltaQue class, which represents
a delta queue.
An object of the CPeriodic class generates periodic timer events.
Either the tick count is added to the delta queue or
elements are removed from the list, depending on the state of the queue.
The user can stop the generation of timer events by pressing a key. 
*/




#include "userinterface.h"

LOCAL_D CConsoleBase* console;

LOCAL_C void DoStartL();
LOCAL_C void CallExampleL();

LOCAL_C void DoStartL()
        {
        // Create and install the active scheduler.
        CActiveScheduler* scheduler = new (ELeave) CActiveScheduler();
        CleanupStack::PushL(scheduler);
        CActiveScheduler::Install(scheduler);

        _LIT(KTextExample, "Delta Queue Example\nCreating and starting timer object\n");
        console->Printf(KTextExample);
        
        // Create an object of the CTimerEntry class.
        CTimerEntry* entry = CTimerEntry::NewL(console);
        CleanupStack::PushL(entry);

        // Create an object of the CUserInterface class.
        CUserInterface* interface = CUserInterface::NewL(console,entry);
        CleanupStack::PushL(interface);

        // Wait for a key press from the user.
        // Generate an asynchronous read request.
        interface->ReadFunc();

        // Start the active scheduler.
        CActiveScheduler::Start();

        // Destroy the objects in the cleanup stack.
        CleanupStack::PopAndDestroy(3,scheduler); // interface, entry, scheduler.
        }

GLDEF_C TInt E32Main() // main function called by E32
    {
        __UHEAP_MARK;
        CTrapCleanup* cleanup=CTrapCleanup::New(); // get clean-up stack
        TRAPD(error, CallExampleL()); // more initialization, then do example
        delete cleanup; // destroy clean-up stack
        __ASSERT_ALWAYS(!error, User::Panic(KTxtEPOC32EX, error));
        __UHEAP_MARKEND;
        return 0; // and return
    }

LOCAL_C void CallExampleL() // initialize and call example code under cleanup stack
    {
        console=Console::NewL(KTxtExampleCode, TSize(KConsFullScreen, KConsFullScreen));
        CleanupStack::PushL(console);
        TRAPD(error, DoStartL()); // perform example function
        if (error)
                console->Printf(KFormatFailed, error);
        else
                console->Printf(KTxtOK);
        console->Printf(KTextPressAnyKey);
        console->Getch(); // get and ignore character
        CleanupStack::PopAndDestroy(); // close console
    }

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