Error in dynamically creating controls, who will help me ???

mystonelh

One of my programs is based on single document type SDI
Dynamically manage and call two videos in the main frame through a document template
CScrollView and CRichEditView

Views currently loaded are automatically destructed when switching views

I used a dynamically created CEdit * m_pEdit object in CScrollView
When used in view m_pEdit = new CEdit; m_pEdit-> Create (..)
Delete m_pEdit when not in use or CScrollView destruct; m_pEdit = NULL;
Do not switch views only in CScrollView constantly new and delete will not go wrong.

problem:
When switching from CScrollView to CRichEditView first,
By tracking, m_pEditCScrollView has been deleted
When switching back to CScrollView, use m_pEdit-> Create (..) in the program code
When I reported an error, I traced this error and found that the Create function of the CEdit class of MFC has an exception.
Click [Ignore] in the exception dialog box and find that this error does not affect the normal operation of the program
The m_pEidt control can also be used normally.

What is the reason, my brother is polite.
How to avoid this exception (you can eliminate the exception prompt box)

neo_mol

I think you should not delete the window before the delete object, causing the object to be destructed and the window still, so an exception occurs

深蓝旅者

It is recommended to learn to use boost :: shared_ptr, only use new, not delete
Smart pointers eliminate the hassle of object management.
www.boost.org/libs/smart_ptr/shared_ptr.htm

fangjiehong

When switching
The new object (CEdit object) is not released normally
Maybe just destructed m_pEdit
Call m_pEdit-> Create (..) again when switching back again
This pointer error may occur

A good way to use smart pointers

mystonelh

Strange thing, I added the code view->SendMessageBox(WM_SIZE,0,0); before new and solved it