How to override CPropertySheet::RemovePage(int nPage)?

[mfc_surfer]

Int the following code, I'm overriding CPropertySheet::RemovePage(int nPage) How can I return a pointer to cdxCDynamicPropPage? class cdxCDynamicPropSheet:public CPropertySheet {} class cdxCDynamicPropPage :public CPropertyPage{} void cdxCDynamicPropSheet::RemovePage( int nPage ) { ASSERT_VALID(this); // remove the page externally if (m_hWnd != NULL) SendMessage(PSM_REMOVEPAGE, nPage); cdxCDynamicPropPage* page = ??? page->m_pSheet = NULL; }

[Antti Keskinen]

Use CPropertySheet::GetPage before sending the message to get a pointer to the CPropertyPage. Then use DYNAMIC_DOWNCAST to cast a pointer to your derived cdxDynamicPropPage class.

cdxCDynamicPropPage* pPage = DYNAMIC_DOWNCAST(cdxCDynamicPropPage, this->GetPage(nPage) );

SendMessage(PSM_REMOVEPAGE, nPage);

Something like that. Remember, though, that a better way would be to call CPropertySheet::RemovePage instead of sending a message. This way, the property page window will be deleted, but the page object would remain, leaving the pointer returned by GetPage valid. Here is a different implementation of your RemovePage method, which removes a page from a property sheet, and then fiddles with the page object.

void cdxCDynamicPropSheet::RemovePage(int nPage)
{
ASSERT_VALID(this);

// Call base class method to remove a page
this\->CPropertySheet::RemovePage(nPage);

// The page object still exists, so acquire a pointer to it
cdxCDynamicPropPage\* pRemovedPage = DYNAMIC\_DOWNCAST( cdxCDynamicPropPage, this\->GetPage(nPage) );

ASSERT( pRemovedPage != NULL );

// Fiddle with the object
pRemovedPage->SomeMethod( someParams );

}

Hope this helps. -Antti Keskinen ---------------------------------------------- The definition of impossible is strictly dependant on what we think is possible.

[mfc_surfer]

It helped Thanks a lot :)