Re: CHtmlView

From:

David Wilkinson <no-reply@effisols.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 01 Jun 2008 23:18:12 -0400

Message-ID:

<#QxNL9FxIHA.1772@TK2MSFTNGP03.phx.gbl>

Alexander Smirnov wrote:

Hi

I want to use CHtmlView in my app to show dynamically created html
content. But I dont need doc/view architecture. I created SDI
application without doc/view support and with ActiveX controls
enabled.
Then I replaced wizard generated view class with folowing class:

class CMyView : public CHtmlView
{
public:
    CMyView (){}
protected:
    virtual void OnInitialUpdate();
    DECLARE_MESSAGE_MAP()
};

BEGIN_MESSAGE_MAP(CMyView , CHtmlView)
END_MESSAGE_MAP()
void CMyView::OnInitialUpdate()
{
   CHtmlView::OnInitialUpdate();
   Navigate(L"about:<body>sample text</body>");
}

in CMainFrame::OnCreate I create it:

m_wndHtml.Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,CRect(0, 0, 0, 0),
this,AFX_IDW_PANE_FIRST, NULL);

Application start OK and CMyView shows "sample text" in it. But when I
close the application I get the folowing error message:

Debug Assertion Failed!
File dbgheap.c
Line 1279
Expression _CrtIsValidHeapPointer(pUserData)

What I do wrong? What is the reason of this error?

Alexander:

I have no experience of using CView without doc/view support, but I believe
CView does a "delete this" in its PostNcDestroy() method, which is bad news if
your CView object is not created on the heap (as yours is not).

Try overriding PostNcDestroy() and doing nothing in it (do not call base class
method!).

Or use a pointer instance CMyView* m_pWndHtml (new'd in the CMainFrame
constructor or OnCreate()) and do not delete it in the CMainFrame destructor.

--
David Wilkinson
Visual C++ MVP