一个活动对象的测试例子

        今天闲来无事写了一个活动对象的测试代码,谁知道一运行死活跑不起来.程序执行到SetActive()就自动退出.硬是把这个简单的例子搞了2个小时. 后来才知道原来Carbide.vs提供的Active框架没有重写NewL()或者NewLC()方法,而我直接调用new (ELeave) CActiveTest2NewClass;并没有初始化ConstructL()里面的数据.编译也不报错,Debug跟踪却是下面一行出问题.郁闷的要命.
       下面的代码就是今天的收获:
CActiveTest2AppUi from ActiveTest2Appui.h
/*
============================================================================
 Name        : CActiveTest2AppUi from ActiveTest2Appui.h
 Author      :
 Version     :
 Copyright   : Your copyright notice
 Description : Declares UI class for application.
============================================================================
*/
#ifndef ACTIVETEST2APPUI_H
#define ACTIVETEST2APPUI_H
// INCLUDES
#include
// FORWARD DECLARATIONS
class CActiveTest2Container;
class CActiveTest2NewClass;

// CLASS DECLARATION
/**
* Application UI class.
* Provides support for the following features:
* - EIKON control architecture
*
*/
class CActiveTest2AppUi : public CAknAppUi
    {
    public: // // Constructors and destructor
        /**
        * EPOC default constructor.
        */     
        void ConstructL();
        /**
        * Destructor.
        */     
        ~CActiveTest2AppUi();
       
    public: // New functions
    public: // Functions from base classes
    private:
        // From MEikMenuObserver
        void DynInitMenuPaneL(TInt aResourceId,CEikMenuPane* aMenuPane);
    private:
        /**
        * From CEikAppUi, takes care of command handling.
        * @param aCommand command to be handled
        */
        void HandleCommandL(TInt aCommand);
        /**
        * From CEikAppUi, handles key events.
        * @param aKeyEvent Event to handled.
        * @param aType Type of the key event.
        * @return Response code (EKeyWasConsumed, EKeyWasNotConsumed).
        */
        virtual TKeyResponse HandleKeyEventL(
            const TKeyEvent& aKeyEvent,TEventCode aType);
    private: //Data
        CActiveTest2Container* iAppContainer;
  CActiveTest2NewClass* iTest2NewClass;
    };
#endif
CActiveTest2AppUi from ActiveTest2Appui.cpp
/*
============================================================================
 Name        : CActiveTest2AppUi from ActiveTest2Appui.cpp
 Author      :
 Version     :
 Copyright   : Your copyright notice
 Description : CActiveTest2AppUi implementation
============================================================================
*/
// INCLUDE FILES
#include "ActiveTest2Appui.h"
#include "ActiveTest2Container.h"
#include
#include "ActiveTest2.hrh"
#include "ActiveTest2NewClass.h"
#include
#include
// ================= MEMBER FUNCTIONS =======================
//
// ----------------------------------------------------------
// CActiveTest2AppUi::ConstructL()
//
// ----------------------------------------------------------
//
void CActiveTest2AppUi::ConstructL()
    {
    BaseConstructL();
    iTest2NewClass = CActiveTest2NewClass::NewL();
    iAppContainer = new (ELeave) CActiveTest2Container;
    iAppContainer->SetMopParent( this );
    iAppContainer->ConstructL( ClientRect() );
    AddToStackL( iAppContainer );
    }
// ----------------------------------------------------
// CActiveTest2AppUi::~CActiveTest2AppUi()
// Destructor
// Frees reserved resources
// ----------------------------------------------------
//
CActiveTest2AppUi::~CActiveTest2AppUi()
    {
    if (iAppContainer)
        {
        RemoveFromStack( iAppContainer );
        delete iAppContainer;
        }
 if(iTest2NewClass)
 {
  delete iTest2NewClass;
 }
   }
// ------------------------------------------------------------------------------
// CActiveTest2AppUi::DynInitMenuPaneL(TInt aResourceId,CEikMenuPane* aMenuPane)
//  This function is called by the EIKON framework just before it displays
//  a menu pane. Its default implementation is empty, and by overriding it,
//  the application can set the state of menu items dynamically according
//  to the state of application data.
// ------------------------------------------------------------------------------
//
void CActiveTest2AppUi::DynInitMenuPaneL(
    TInt /*aResourceId*/,CEikMenuPane* /*aMenuPane*/)
    {
    }
// ----------------------------------------------------
// CActiveTest2AppUi::HandleKeyEventL(
//     const TKeyEvent& aKeyEvent,TEventCode /*aType*/)
// takes care of key event handling
// ----------------------------------------------------
//
TKeyResponse CActiveTest2AppUi::HandleKeyEventL(
    const TKeyEvent& /*aKeyEvent*/,TEventCode /*aType*/)
    {
    return EKeyWasNotConsumed;
    }
// ----------------------------------------------------
// CActiveTest2AppUi::HandleCommandL(TInt aCommand)
// takes care of command handling
// ----------------------------------------------------
//
void CActiveTest2AppUi::HandleCommandL(TInt aCommand)
    {
    switch ( aCommand )
        {
        case EAknSoftkeyBack:
        case EEikCmdExit:
            {
            Exit();
            break;
            }
        case EActiveTest2CmdAppTest:
            {
   // Info message shown only in the emulator
   //iEikonEnv->InfoMsg(_L("test"));
   
   //Load localized message from the resource file
   //HBufC* message = CEikonEnv::Static()->AllocReadResourceLC(R_MESSAGE_TEXT);
   // Show information note dialog
   //CAknInformationNote* note = new (ELeave) CAknInformationNote;
   //note->ExecuteLD(message->Des());
   //CleanupStack::PopAndDestroy(message);
            iTest2NewClass->StartL(3000000);
            break;
            }
        // TODO: Add Your command handling code here
        default:
            break;     
        }
    }
 
ActiveTest2NewClass.h
/*
============================================================================
 Name        : ActiveTest2NewClass.h
 Author      :
 Version     :
 Copyright   : Your copyright notice
 Description : CActiveTest2NewClass declaration
============================================================================
*/
#ifndef ACTIVETEST2NEWCLASS_H
#define ACTIVETEST2NEWCLASS_H
#include  // For CActive, link against: euser.lib
#include   // For RTimer, link against: euser.lib
class CActiveTest2NewClass : public CActive
{
public:
 // C++ constructor
 CActiveTest2NewClass();
 
 // Second-phase constructor
 void ConstructL();
 
 // Cancel and destroy
 ~CActiveTest2NewClass();
public: // New functions
 // Function for making the initial request
 void StartL(TTimeIntervalMicroSeconds32 aDelay);
 
//就是下面两个方法Carbide.vs没提供
 static CActiveTest2NewClass* NewLC();
 static CActiveTest2NewClass* NewL();
private: // From CActive
 // Handle completion
 void RunL();
 
 // How to cancel me
 void DoCancel();
 
 // Override to handle leaves from RunL(). Default implementation causes
 // the active scheduler to panic.
 //void RunError(TInt aError);
private:
 enum TActiveTest2NewClassState
 {
     EUninitialized, // Uninitialized
     EInitialized, // Initalized
     EError   // Error condition
 };
private:
 TInt    iState;  // State of the active object
 RTimer iTimer;  // Provides async timing service
 TInt iCount;
};
#endif

 
ActiveTest2NewClass.cpp
/*
============================================================================
 Name        : ActiveTest2NewClass.cpp
 Author      :
 Version     :
 Copyright   : Your copyright notice
 Description : CActiveTest2NewClass implementation
============================================================================
*/
#include "ActiveTest2NewClass.h"
#include
CActiveTest2NewClass::CActiveTest2NewClass() : CActive(EPriorityStandard) // Standard priority
{
}
void CActiveTest2NewClass::ConstructL()
{
 User::LeaveIfError(iTimer.CreateLocal()); // Initialize timer
 CActiveScheduler::Add(this);    // Add to scheduler
}
CActiveTest2NewClass* CActiveTest2NewClass::NewLC()
{
 CActiveTest2NewClass* self = new (ELeave) CActiveTest2NewClass;
 CleanupStack::PushL(self);
 self->ConstructL();
 return self;
}

CActiveTest2NewClass* CActiveTest2NewClass::NewL()
{
 CActiveTest2NewClass* self = NewLC();
 CleanupStack::Pop(self);
 return self;
}
CActiveTest2NewClass::~CActiveTest2NewClass()
{
 Cancel(); // Cancel any request, if outstanding
 // Delete instance variables if any
}
void CActiveTest2NewClass::DoCancel()
{
 iTimer.Cancel();
}
void CActiveTest2NewClass::StartL(TTimeIntervalMicroSeconds32 aDelay)
{
 Cancel();      // Cancel any request, just to be sure
 iState = EUninitialized;
 iTimer.After(iStatus, aDelay); // Set for later
 SetActive();     // Tell scheduler a request is active
}
void CActiveTest2NewClass::RunL()
{
 if (iState == EUninitialized) {
  // Do something the first time RunL() is called
  //iState = EInitialized;
  iCount++;
  _LIT(TempString,"the iCount's value is :");
  HBufC* iBuf = HBufC::NewLC(100);
  iBuf->Des().Copy(TempString);
  iBuf->Des().AppendNum(iCount);
  CEikonEnv::Static()->InfoMsg(*iBuf);
  CleanupStack::PopAndDestroy(iBuf);
 } else if (iState != EError) {
  // Do something
 }
 iTimer.After(iStatus, 3000000); // Set for 1 sec later
 SetActive();     // Tell scheduler a request is active
}

 
另外就是以下几点收获:
1:debug到某一行出错并不代表就是这行的错误,可能是它上面一行,要看debug窗口里面红色显示的内容.
2:在epoc32/wins/c/system/Bootdata下面建一个ErrRd文件(无扩展名),可以让程序在关闭退出的时候报一个错误码.例如我的这个错误报kern-exec 0.之后可以到
http://www.symbian.com/developer/techlib/v70docs/SDL_v7.0/doc_source/reference/SystemPanics/index.html#PanicsReference%2eindex
查找这个错误的原因.

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