Closing MFC SDI document causes crash

Since this is an SDI, the document exists for the life of the application.

In an SDI app, before reusing a document (such as when you "close" the file or "open" a new one) the framework will call the document class's DeleteContents function. It's in this function you should do any clean up you have to do to make the document appear to be "new".

Also, with an SDI or MDI app, instead of setting the window text by calling SetWindowText, you can let the framework handle it by just setting the title of the currently open document. To do this just call the document's SetTitle method.

Hope this helps.

This is my code. My app dispalys the doc contents in a tree view. Is there a better way to get the main frame title or tree view to empty?

CMyDoc::OnFileClose()
{
   DeleteContents();
   m_docOpenFlag = false;
   UpdateAllViews(NULL);
}

void CMyView::OnUpdate(CView* pSender, LPARAM lHint, CObject* pHint)
{
	//if the doc is closed
	if(pMyDoc->m_docOpenFlag == false)
	{
           //empty the tree view 
	   CTreeCtrl& tree = GetTreeCtrl();
	   tree.DeleteAllItems();

	   //set the main frame title
	   AfxGetMainWnd()->SetWindowText(_T("BWE"));
}