C++ NS_IF_RELEASE函数代码示例

 NS_IMETHOD Run() {
   NS_ASSERTION(NS_IsMainThread(), "Must be on main thread.");
   // Explicitly release the MediaResource reference. We *must* do this on
   // the main thread, so we must explicitly release it here, we can't rely
   // on the destructor to release it, since if this event runs before its
   // dispatch call returns the destructor may run on the non-main thread.
   mResource = nullptr;
   NS_ASSERTION(sThreadPoolRefCnt > 0, "sThreadPoolRefCnt Should be non-negative");
   sThreadPoolRefCnt--;
   if (sThreadPoolRefCnt == 0) {
     NS_ASSERTION(sThreadPool != nullptr, "Should have thread pool ref if sThreadPoolRefCnt==0.");
     // Note: store ref to thread pool, then clear global ref, then
     // Shutdown() using the stored ref. Events can run during the Shutdown()
     // call, so if we release after calling Shutdown(), another event may
     // have incremented the refcnt in the meantime, and have a dangling
     // pointer to the now destroyed threadpool!
     nsCOMPtr<nsIThreadPool> pool = sThreadPool;
     NS_IF_RELEASE(sThreadPool);
     pool->Shutdown();
   }
   return NS_OK;
 }

NS_IMETHODIMP nsRenderingContextPh :: Init( nsIDeviceContext* aContext, nsIWidget *aWindow ) 
{
	nsresult res;
	
	mContext = aContext;
	NS_IF_ADDREF(mContext);
	
	PtWidget_t *widget = (PtWidget_t*) aWindow->GetNativeData( NS_NATIVE_WIDGET );
	
	if( !widget ) {
		NS_IF_RELEASE( mContext ); // new
		NS_ASSERTION(widget,"nsRenderingContext::Init (with a widget) widget is NULL!");
		return NS_ERROR_FAILURE;
	}
	
	mRegionID = PtWidgetRid( widget );
	if( mRegionID ) {
		mSurface = new nsDrawingSurfacePh();
		if( mSurface ) {

			mGC = PgCreateGC( 0 );
			mOwner = PR_TRUE;

			/* use the dc you get by doing a PhDCSetCurrent( NULL ) */
			res = mSurface->Init( _Ph_->dflt_draw_context, mGC );
			if( res != NS_OK )
				return NS_ERROR_FAILURE;
			
			mOffscreenSurface = mSurface;
			NS_ADDREF( mSurface );

			mSurfaceDC = ((nsDrawingSurfacePh*)mSurface)->GetDC();
		}
		else 
			return NS_ERROR_FAILURE;
	}

	return CommonInit();
}

static void
SupportedSocketTypesResponse(TpProxy *proxy, const GValue *out,
                             const GError *error, gpointer user_data, GObject *weak_object)
{
    csITpChannelTypeStreamTubeSupportedSocketTypesCB *callback = (csITpChannelTypeStreamTubeSupportedSocketTypesCB *)user_data;
    if (!callback)
        return;

    if (error != NULL) {
        callback->GetPropertySupportedSocketTypesError(nsDependentCString(g_quark_to_string(error->domain)),
                error->code, nsDependentCString(error->message));
        return;
    }

    GHashTable * supportedsockettypes;
    supportedsockettypes = (GHashTable *)g_value_get_boxed(out);
    nsCOMPtr<nsIArray> cSupportedSocketTypes;
    csTpSupportedSocketMap::Create((gpointer)supportedsockettypes, getter_AddRefs(cSupportedSocketTypes));

    callback->GetPropertySupportedSocketTypesDone(cSupportedSocketTypes);
    NS_IF_RELEASE(callback);
}

static void
HandleOwnersResponse(TpProxy *proxy, const GValue *out,
    const GError *error, gpointer user_data, GObject *weak_object)
{
  csITpChannelInterfaceGroupHandleOwnersCB *callback = (csITpChannelInterfaceGroupHandleOwnersCB *)user_data;
  if (!callback)
    return;

  if (error != NULL) {
    callback->GetPropertyHandleOwnersError(nsDependentCString(g_quark_to_string(error->domain)),
                                 error->code, nsDependentCString(error->message));
    return;
  }

  GHashTable * handleowners;
  handleowners = (GHashTable *)g_value_get_boxed(out);
  nsCOMPtr<nsIArray> cHandleOwners;
  csTpHandleOwnerMap::Create((gpointer)handleowners, getter_AddRefs(cHandleOwners));

  callback->GetPropertyHandleOwnersDone(cHandleOwners);
  NS_IF_RELEASE(callback);
}

static void
LocationAccessControlResponse(TpProxy *proxy, const GValue *out,
    const GError *error, gpointer user_data, GObject *weak_object)
{
  csITpConnectionInterfaceLocationLocationAccessControlCB *callback = (csITpConnectionInterfaceLocationLocationAccessControlCB *)user_data;
  if (!callback)
    return;

  if (error != NULL) {
    callback->GetPropertyLocationAccessControlError(nsDependentCString(g_quark_to_string(error->domain)),
                                 error->code, nsDependentCString(error->message));
    return;
  }

  GValueArray * locationaccesscontrol;
  locationaccesscontrol = (GValueArray *)g_value_get_boxed(out);
  nsCOMPtr<csITpRichPresenceAccessControl> cLocationAccessControl;
  csTpRichPresenceAccessControl::Create((gpointer)locationaccesscontrol, getter_AddRefs(cLocationAccessControl));

  callback->GetPropertyLocationAccessControlDone(cLocationAccessControl);
  NS_IF_RELEASE(callback);
}

static void
GetAvailableTubeTypesResponse(TpChannel *proxy,
    const GArray *available_tube_types,
    const GError *error, gpointer user_data, GObject *weak_object)
{
  csITpChannelTypeTubesGetAvailableTubeTypesCB *callback = (csITpChannelTypeTubesGetAvailableTubeTypesCB *)user_data;
  if (!callback)
    return;

  if (error != NULL) {
    callback->OnGetAvailableTubeTypesError(nsDependentCString(g_quark_to_string(error->domain)),
                        error->code, nsDependentCString(error->message));
    return;
  }

  PRUint32 cAvailableTubeTypesCount = available_tube_types->len;
  PRUint32 *cAvailableTubeTypes = (PRUint32 *)nsMemory::Alloc(sizeof(PRUint32)*cAvailableTubeTypesCount);
  for (unsigned int i=0; i<cAvailableTubeTypesCount; i++)
    cAvailableTubeTypes[i] = g_array_index(available_tube_types, guint, i);

  callback->OnGetAvailableTubeTypesDone(cAvailableTubeTypesCount, cAvailableTubeTypes);
  NS_IF_RELEASE(callback);
}

NS_IMETHODIMP nsRenderingContextPh :: SetFont( nsIFontMetrics *aFontMetrics ) 
{
	if( mFontMetrics == aFontMetrics ) return NS_OK;
	
	nsFontHandle  fontHandle;			/* really a nsString */
	char      *pFontHandle;
	
	NS_IF_RELEASE(mFontMetrics);
	mFontMetrics = aFontMetrics;
	NS_IF_ADDREF(mFontMetrics);
	
  if( mFontMetrics == nsnull ) return NS_OK;
	
	mFontMetrics->GetFontHandle( fontHandle );
	pFontHandle = (char *) fontHandle;
    
	if( pFontHandle ) {
		if( mPhotonFontName ) free( mPhotonFontName );
		mPhotonFontName = strdup( pFontHandle );
		}
	
	return NS_OK;
}

void
nsTreeSanitizer::ReleaseStatics()
{
  delete sElementsHTML;
  sElementsHTML = nsnull;

  delete sAttributesHTML;
  sAttributesHTML = nsnull;

  delete sElementsSVG;
  sElementsSVG = nsnull;

  delete sAttributesSVG;
  sAttributesSVG = nsnull;

  delete sElementsMathML;
  sElementsMathML = nsnull;

  delete sAttributesMathML;
  sAttributesMathML = nsnull;

  NS_IF_RELEASE(sNullPrincipal);
}

static void
GetRemotePendingMembersResponse(TpChannel *proxy,
    const GArray *handles,
    const GError *error, gpointer user_data, GObject *weak_object)
{
  csITpChannelInterfaceGroupGetRemotePendingMembersCB *callback = (csITpChannelInterfaceGroupGetRemotePendingMembersCB *)user_data;
  if (!callback)
    return;

  if (error != NULL) {
    callback->OnGetRemotePendingMembersError(nsDependentCString(g_quark_to_string(error->domain)),
                        error->code, nsDependentCString(error->message));
    return;
  }

  PRUint32 cHandlesCount = handles->len;
  PRUint32 *cHandles = (PRUint32 *)nsMemory::Alloc(sizeof(PRUint32)*cHandlesCount);
  for (unsigned int i=0; i<cHandlesCount; i++)
    cHandles[i] = g_array_index(handles, guint, i);

  callback->OnGetRemotePendingMembersDone(cHandlesCount, cHandles);
  NS_IF_RELEASE(callback);
}

NS_IMETHODIMP nsWidget::DispatchEvent( nsGUIEvent *aEvent, nsEventStatus &aStatus ) {

    NS_ADDREF(aEvent->widget);

    if( nsnull != mMenuListener ) {
        if( NS_MENU_EVENT == aEvent->eventStructType )
            aStatus = mMenuListener->MenuSelected(NS_STATIC_CAST(nsMenuEvent&, *aEvent));
    }

    aStatus = nsEventStatus_eIgnore;

///* ATENTIE */ printf( "mEventCallback call (%d %d) this=%p\n", aEvent->point.x, aEvent->point.y, this );

    if( nsnull != mEventCallback ) aStatus = (*mEventCallback)(aEvent);

    // Dispatch to event listener if event was not consumed
    if( (aStatus != nsEventStatus_eIgnore) && (nsnull != mEventListener) )
        aStatus = mEventListener->ProcessEvent(*aEvent);

    NS_IF_RELEASE(aEvent->widget);

    return NS_OK;
}

NS_IMETHODIMP nsSmtpService::SendMailMessage(nsIFile * aFilePath,
                                        const char * aRecipients, 
                                        nsIMsgIdentity * aSenderIdentity,
                                        const char * aPassword,
                                        nsIUrlListener * aUrlListener, 
                                        nsIMsgStatusFeedback *aStatusFeedback,
                                        nsIInterfaceRequestor* aNotificationCallbacks,
                                        bool aRequestDSN,
                                        nsIURI ** aURL,
                                        nsIRequest ** aRequest)
{
  nsIURI * urlToRun = nullptr;
  nsresult rv = NS_OK;

  nsCOMPtr<nsISmtpServer> smtpServer;
  rv = GetServerByIdentity(aSenderIdentity, getter_AddRefs(smtpServer));

  if (NS_SUCCEEDED(rv) && smtpServer)
  {
    if (aPassword && *aPassword)
      smtpServer->SetPassword(nsDependentCString(aPassword));

    // this ref counts urlToRun
    rv = NS_MsgBuildSmtpUrl(aFilePath, smtpServer, aRecipients, aSenderIdentity,
                            aUrlListener, aStatusFeedback, 
                            aNotificationCallbacks, &urlToRun, aRequestDSN);
    if (NS_SUCCEEDED(rv) && urlToRun)	
      rv = NS_MsgLoadSmtpUrl(urlToRun, nullptr, aRequest);

    if (aURL) // does the caller want a handle on the url?
      *aURL = urlToRun; // transfer our ref count to the caller....
    else
      NS_IF_RELEASE(urlToRun);
  }

  return rv;
}

txExecutionState::~txExecutionState()
{
    MOZ_COUNT_DTOR(txExecutionState);

    delete mResultHandler;
    delete mLocalVariables;
    delete mEvalContext;

    PRInt32 i;
    for (i = 0; i < mTemplateRuleCount; ++i) {
        NS_IF_RELEASE(mTemplateRules[i].mModeLocalName);
    }
    delete [] mTemplateRules;
    
    txStackIterator varsIter(&mLocalVarsStack);
    while (varsIter.hasNext()) {
        delete (txVariableMap*)varsIter.next();
    }

    txStackIterator contextIter(&mEvalContextStack);
    while (contextIter.hasNext()) {
        txIEvalContext* context = (txIEvalContext*)contextIter.next();
        if (context != mInitialEvalContext) {
            delete context;
        }
    }

    txStackIterator handlerIter(&mResultHandlerStack);
    while (handlerIter.hasNext()) {
        delete (txAXMLEventHandler*)handlerIter.next();
    }

    txStackIterator paramIter(&mParamStack);
    while (paramIter.hasNext()) {
        delete (txVariableMap*)paramIter.next();
    }
}

nsresult nsAbView::RemoveCardAt(PRInt32 row)
{
  nsresult rv;

  AbCard *abcard = (AbCard*) (mCards.ElementAt(row));
  NS_IF_RELEASE(abcard->card);
  mCards.RemoveElementAt(row);
  PR_FREEIF(abcard->primaryCollationKey);
  PR_FREEIF(abcard->secondaryCollationKey);
  PR_FREEIF(abcard);

  
  // This needs to happen after we remove the card, as RowCountChanged() will call GetRowCount()
  if (mTree) {
    rv = mTree->RowCountChanged(row, -1);
    NS_ENSURE_SUCCESS(rv,rv);
  }

  if (mAbViewListener && !mSuppressCountChange) {
    rv = mAbViewListener->OnCountChanged(mCards.Count());
    NS_ENSURE_SUCCESS(rv,rv);
  }
  return NS_OK;
}

static void
RemotePendingMembersResponse(TpProxy *proxy, const GValue *out,
    const GError *error, gpointer user_data, GObject *weak_object)
{
  csITpChannelInterfaceGroupRemotePendingMembersCB *callback = (csITpChannelInterfaceGroupRemotePendingMembersCB *)user_data;
  if (!callback)
    return;

  if (error != NULL) {
    callback->GetPropertyRemotePendingMembersError(nsDependentCString(g_quark_to_string(error->domain)),
                                 error->code, nsDependentCString(error->message));
    return;
  }

  GArray * remotependingmembers;
  remotependingmembers = (GArray *)g_value_get_boxed(out);
  PRUint32 cRemotePendingMembersCount = remotependingmembers->len;
  PRUint32 *cRemotePendingMembers = (PRUint32 *)nsMemory::Alloc(sizeof(PRUint32)*cRemotePendingMembersCount);
  for (unsigned int i=0; i<cRemotePendingMembersCount; i++)
    cRemotePendingMembers[i] = g_array_index(remotependingmembers, guint, i);

  callback->GetPropertyRemotePendingMembersDone(cRemotePendingMembersCount, cRemotePendingMembers);
  NS_IF_RELEASE(callback);
}

nsresult MailEwsMsgCompose::CreateComponents(void)
{
    nsresult  rv = NS_OK;

    if (!m_pIOService) {
        IMPORT_LOG0("Creating nsIOService\n");
    
        m_pIOService = do_GetService(NS_IOSERVICE_CONTRACTID, &rv);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    NS_IF_RELEASE(m_pMsgFields);

    if (NS_SUCCEEDED(rv)) {
        rv = CallCreateInstance(kMsgCompFieldsCID, &m_pMsgFields);
        if (NS_SUCCEEDED(rv) && m_pMsgFields) {
            IMPORT_LOG0("nsOutlookCompose - CreateComponents succeeded\n");
            m_pMsgFields->SetForcePlainText(false);
            return NS_OK;
        }
    }

    return NS_ERROR_FAILURE;
}