TB9.2 Example Applications: examples/Base/ArraysAndLists/linkedlist/deltaque/src/deltaque.cpp Source File

00001 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
+00002 // All rights reserved.
+00003 // This component and the accompanying materials are made available
+00004 // under the terms of "Eclipse Public License v1.0"
+00005 // which accompanies this distribution, and is available
+00006 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
+00007 //
+00008 // Initial Contributors:
+00009 // Nokia Corporation - initial contribution.
+00010 //
+00011 // Contributors:
+00012 //
+00013 // Description:
+00014 // Contains the E32Main() function, which executes the example.
+00015 // The example demonstrates the use of the TDeltaQue class, which represents
+00016 // a delta queue.
+00017 // An object of the CPeriodic class generates periodic timer events.
+00018 // Either the tick count is added to the delta queue or
+00019 // elements are removed from the list, depending on the state of the queue.
+00020 // The user can stop the generation of timer events by pressing a key.
+00021 //
+00022 
+00023 
+00024 
+00029 #include "userinterface.h"
+00030 
+00031 LOCAL_D CConsoleBase* console;
+00032 
+00033 LOCAL_C void DoStartL();
+00034 LOCAL_C void CallExampleL();
+00035 
+00036 LOCAL_C void DoStartL()
+00037         {
+00038         // Create and install the active scheduler.
+00039         CActiveScheduler* scheduler = new (ELeave) CActiveScheduler();
+00040         CleanupStack::PushL(scheduler);
+00041         CActiveScheduler::Install(scheduler);
+00042 
+00043         _LIT(KTextExample, "Delta Queue Example\nCreating and starting timer object\n");
+00044         console->Printf(KTextExample);
+00045         
+00046         // Create an object of the CTimerEntry class.
+00047         CTimerEntry* entry = CTimerEntry::NewL(console);
+00048         CleanupStack::PushL(entry);
+00049 
+00050         // Create an object of the CUserInterface class.
+00051         CUserInterface* interface = CUserInterface::NewL(console,entry);
+00052         CleanupStack::PushL(interface);
+00053 
+00054         // Wait for a key press from the user.
+00055         // Generate an asynchronous read request.
+00056         interface->ReadFunc();
+00057 
+00058         // Start the active scheduler.
+00059         CActiveScheduler::Start();
+00060 
+00061         // Destroy the objects in the cleanup stack.
+00062         CleanupStack::PopAndDestroy(3,scheduler); // interface, entry, scheduler.
+00063         }
+00064 
+00065 GLDEF_C TInt E32Main() // main function called by E32
+00066     {
+00067         __UHEAP_MARK;
+00068         CTrapCleanup* cleanup=CTrapCleanup::New(); // get clean-up stack
+00069         TRAPD(error, CallExampleL()); // more initialization, then do example
+00070         delete cleanup; // destroy clean-up stack
+00071         __ASSERT_ALWAYS(!error, User::Panic(KTxtEPOC32EX, error));
+00072         __UHEAP_MARKEND;
+00073         return 0; // and return
+00074     }
+00075 
+00076 LOCAL_C void CallExampleL() // initialize and call example code under cleanup stack
+00077     {
+00078         console=Console::NewL(KTxtExampleCode, TSize(KConsFullScreen, KConsFullScreen));
+00079         CleanupStack::PushL(console);
+00080         TRAPD(error, DoStartL()); // perform example function
+00081         if (error)
+00082                 console->Printf(KFormatFailed, error);
+00083         else
+00084                 console->Printf(KTxtOK);
+00085         console->Printf(KTextPressAnyKey);
+00086         console->Getch(); // get and ignore character
+00087         CleanupStack::PopAndDestroy(); // close console
+00088     }
+