the problem of using download manager api,memory leak!

[never115]

downloadEngineNew.h

/*
 * downloadEngineNew.h
 *
 *  Created on: 2009-4-22
 *      Author: Administrator
 */

#ifndef DOWNLOADENGINENEW_H_
#define DOWNLOADENGINENEW_H_

#include <downloadmgrclient.h> 

class CDownloadMgrUiDownloadsList;
class CDownloadMgrUiLibRegistry;
class CDownloadMgrUiUserInteractions;


const TUid KMyAppUid = {0xE08C8196};


class CDownLoadMgr : public MHttpDownloadMgrObserver 

    {

public:
     static CDownLoadMgr* NewL();
     static CDownLoadMgr* NewLC();
     
     ~CDownLoadMgr();
     
   //  void StartDownloading(const TDesC8& aUrl,const TDesC8& aDestFilename);
     void StartDownloading(const TDesC8& url,const TDesC8 & des);
     void DoSomethingWhenCompleted();
    
     //  To observe download events from MHttpDownloadMgrObserver
     void HandleDMgrEventL (RHttpDownload &aDownload, THttpDownloadEvent aEvent);
     

private:
     void ConstructL();
     CDownLoadMgr();
     
private: //Data

     // Return value of download creation
     TInt retVal ;
   
     //Download manager to download the sisx
     RHttpDownloadMgr iDMgr;
     //Registry to register ui component
     CDownloadMgrUiLibRegistry * iUiReg;
     // UI interaction component
     CDownloadMgrUiUserInteractions* idMgrUserInteractions;
     //Download list component
     CDownloadMgrUiDownloadsList * iMgrDownloadsList;
     
    };

#endif /* DOWNLOADENGINENEW_H_ */

downloadEngineNew.cpp

/*
 * downloadEngineNew.cpp
 *
 *  Created on: 2009-4-22
 *      Author: Administrator
 */

#include <cdownloadmgruidownloadslist.h>
#include <cdownloadmgruilibregistry.h> 
#include <cdownloadmgruiuserinteractions.h> 
#include <COMMDB.H>
#include <aknnotewrappers.h> 
#include "downloadEngineNew.h"

// Change these descriptor values(Give the correct URL path and sisx name)

 _LIT8( KCodUrl, "http://192.168.1.112/gan/1.swf");
 
 _LIT( KTempPath , "c:\\Data\\Videos\\new.swf" );


CDownLoadMgr* CDownLoadMgr::NewL()
    {
    CDownLoadMgr* self = CDownLoadMgr::NewLC();
    CleanupStack::Pop(self);
    return self;
    }

CDownLoadMgr* CDownLoadMgr::NewLC()
    {
    CDownLoadMgr* self = new (ELeave) CDownLoadMgr;
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
    }

CDownLoadMgr::CDownLoadMgr()
    {
  
    }

void CDownLoadMgr::ConstructL()
    {
    
    // Connect to download manager
    
    iDMgr.ConnectL( KMyAppUid,*this, ETrue );
	
    iUiReg = CDownloadMgrUiLibRegistry::NewL( iDMgr );
	   
    idMgrUserInteractions = &iUiReg->RegisterUserInteractionsL();

	iMgrDownloadsList = &iUiReg->RegisterDownloadsListL();
	
	iDMgr.DeleteAll();    
    }
    
CDownLoadMgr::~CDownLoadMgr()
    {
  
   delete iUiReg;
    iDMgr.Close();
    
	
    }
    
// Fn to download sisx from URL    
void  CDownLoadMgr::StartDownloading(const TDesC8& url,const TDesC8 & des)
    {
    
   // AccessPt retrievel from CommsDB
   
       TUint32 iapId(0);
            
       CCommsDatabase* cdb = CCommsDatabase::NewL(EDatabaseTypeIAP);
	   CleanupStack::PushL(cdb);

			CCommsDbConnectionPrefTableView* commDBView = cdb->OpenConnectionPrefTableInRankOrderLC(ECommDbConnectionDirectionOutgoing);
			if(commDBView->GotoFirstRecord() == KErrNone)
			{
				CCommsDbConnectionPrefTableView::TCommDbIapConnectionPref pref;
				commDBView->ReadConnectionPreferenceL(pref);
				iapId = pref.iBearer.iIapId;
			}

		CleanupStack::PopAndDestroy(commDBView);
		CleanupStack::PopAndDestroy(cdb);
		
	 //Setting Attribute for download manger ( Access Point)
	 
	    User::LeaveIfError( iDMgr.SetIntAttribute( EDlMgrIap, (TInt32)iapId ) ); 
	
	    TBufC8<254> URL(url);
	    
	 //Creation of download obj   
				 
	    RHttpDownload& download = iDMgr.CreateDownloadL(URL,retVal);
	    
	 // Setting attributes for download object
	    TBufC8<254> buf(des);
	 
	    TFileName filename(KTempPath);
	    
	    // Setting destination path for the downloaded file to be stored
	    
        download.SetStringAttribute( EDlAttrDestFilename, filename );

        

        TBool silattr(ETrue);
        
     //download progress will be silent   

	   download.SetBoolAttribute(EDlAttrSilent,silattr);  
			
     // start downloading
     
     if(retVal)                
				 {
					TInt state = download.Start();
				 }
				 else
				 {
				  _LIT(Ktext,"Download creation failed");
				  CAknInformationNote* informationNote;
                  informationNote = new ( ELeave ) CAknInformationNote;
                   informationNote->ExecuteLD(Ktext);
    			 }

	
    }
    
 void  CDownLoadMgr::DoSomethingWhenCompleted()
    {  
 //   iMgrDownloadsList->DisplayDownloadsListL();
    User::InfoPrint( _L( "Completed" ) );			  
    }
    	

//  To observe download events from MHttpDownloadMgrObserver
void CDownLoadMgr::HandleDMgrEventL (RHttpDownload &aDownload, THttpDownloadEvent aEvent)
	{
	switch ( aEvent.iDownloadState )
		{
			case EHttpDlCreated:
			{
			break;
			}
			case EHttpDlInprogress:
			{
//			  _LIT(Ktext,"downing");
//						  CAknInformationNote* informationNote;
//		                  informationNote = new ( ELeave ) CAknInformationNote;
//		                   informationNote->ExecuteLD(Ktext);
			break;
			}
			case EHttpDlCompleted:
			{
			// On completion of download , call silent installation function
//			TFileName filename(KTempPath );
//			aDownload.SetStringAttribute( EDlAttrDestFilename, filename );
//			aDownload.Move();

			DoSomethingWhenCompleted();
			break;
			}
			case EHttpDlFailed:
			{
			 _LIT(Kerr,"Downloading failed");
			TInt32 iVal = 0L;	
		    TBuf<40> derror;
		
			aDownload.GetIntAttribute(EDlAttrGlobalErrorId, iVal);
			derror.Append(Kerr);
			derror.AppendNum(iVal);
			
			CAknInformationNote* informationNote;
            informationNote = new ( ELeave ) CAknInformationNote;
            informationNote->ExecuteLD(derror);
			
		    aDownload.Delete();
			break;
			}
			case EHttpDlPaused:
			{
				break;
			}

			default :
			{
		       break;
			}
		}
		
	}

my problem:
1、if i delete
TBool silattr(ETrue);
download.SetBoolAttribute(EDlAttrSilent,silattr);
or change it to EFalse,when i exit my app,it notes that "the application is closed,alloc xxxxx",i don't know why?MY SDK is MR.
hooklogger display that the problem happens in DownloadMgrUiLib.dll

can anyone help me?