Re: How do controls get connected to variables in a CFormView?

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Thu, 19 Jul 2007 18:41:50 -0400
<> wrote:


I am trying to modify a project that generates an ActiveX control.
The control window is a CSplitterWnd with two panes, one on top of the
other. The class representing the bottom pane is derived from
CFormView. It has several controls, whose initial placement is
determined by a resource. The controls are positioned in a routine
called from the OnSize() event handler. That handler checks to see if
m_hWnd of one of the control variables is pointing to a valid window
yet, and if it is, it repositions all of the controls, happily
referring to them by their variable names.

The top pane was represented by a CView object. All drawing in that
had to be done by hand, without any support from MFC classes. I want
to move some of the controls from the bottom pane to the top pane, and
I want to use CEditBox or CStatic objects for text in that window,
instead of using device contexts and brushes and fun things like
that. So, I'm trying to create a resource, and then using ClassWizard
to generate a class for the resource, and then using that class name
in the splitter window's CreateView() call. I created the dialog,
gave it the child style and took away its title bar, gave it a button
named "Button 1", created a class for it derived from CFormView,
created a variable for Button 1 named m_button1, and added an OnSize()
handler. In OnSize(), I call ::IsWindow(m_button1.m_hWnd). If that
returns TRUE, I display a message box.

After all this, I run my program, and the message box never displays.

Is m_button1 ever associated with my button? Or do I have to do
something to set up the association myself? There's no code that does
anything like that in the other pane. All of those controls are just
automatically connected to their variables by MFC, working very nicely
behind the scenes. What am I missing?

Thank you very much.

Rob Richardson

The controls are associated with variables by DDX_Control calls in
DoDataExchange of your view class. These calls are added automatically
by the wizard if you add the control variables this way: right-click on
the control in the dialog template, select Add Variable.

You can add the same calls by hand once you see what the wizard does for
one of them.

Scott McPhillips [MVP VC++]

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