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Forums » Prof-UIS Tech Support » Crash when "Tabs" popup is destroyed during TrackPopupMenu Collapse All
Subject Author Date
Giacomo Ciucchi May 14, 2018 - 10:49 AM

In our code we have CExtTabWnd-derived class for CExtTabPageContainerWnd-derived container. New dialogs are created during the execution and populated as tabs using PageInsert. It is possible to click on Tabs button and get a popup with a list of all tabs added. But sometimes when such popup is open and a new dialog is created the application crashes trying to dereference a pointer to a deleted popup.

A piece from CExtPopupMenuWnd::_TrackPopupMenu:

    ASSERT_VALID( this );
    m_bCanceling = false;


    ::GetCursorPos( &m_ptTrackInvoked );
    m_ptTrackWatched = m_ptTrackInvoked;

    if( _IsTopLevelPopup() )

The popup is deleted between the first and the last rows of the piece, because first ASSERT passes and the one inside _IsTopLevelPopup() fails.

CExtResizableDialog::OnInitDialog() causes the deletion, but it seems sometimes it happens at a bad time and leads to a crash. The dialogs are created in application’s main thread.

Is there a way to avoid such crashes?

TSELLC Support Jul 26, 2019 - 2:59 AM

This was answered in a separate email.