RE: Sending Registered Windows Message from one View to another

"Anders Eriksson" wrote:


The easiest thing you could do, is to pass the correct view type pointers to
each other after creating them [inside CMainFrame]. Then you would be able to
call methods of a view from another one directly. Anyway, this design has an
extra coupling and thus is not the best solution, I think.

Another way [which I think is more correct], is to send a user defined
message. In this case, you have to pass the HWND handlers of views to each
other after their creation. Then from a view you can do:
PostMessage(m_hWndMyFormView, UWM_DOSMTH, 0, 0);

Inside your another view class, there should be a handler;

ON_MESSAGE(UWM_DOSMTH, &OnMyFormView::OnDoSmth)
// ...inside BEGIN/END message map macros

LRESULT OnMyFormView::OnDoSmth(WPARAM, LPARAM)
{
// whatever
}

Of course, you should have your UWM_DOSMTH constant defined (registered).

Yet another way, which almost removes coupling, is to do upward/downward
messaging; first you get the main frame and post a message to it;
AfxGetMainWnd()->PostMessage(UWM_DOSMTH);

....then inside the handler of CMainFrame;

pTheView->PostMassege(UWM_DOSMTH);

Of course, you should have a handler function inside the view class as before.

 

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Arman

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