Hello !

The Visual Studio series has one crucial advantage over other IDEs: it tends
to state very specifically what the error is. The first error gives you a
hint: "use of __typeof expects a fully defined _managed_ type" and the
second error confirms it: "... from a non-member function or a member of an
_unmanaged_ class".

Putting it in plain english, the class CTestDlg is not defined as a managed
type, period. If you're writing for the C++/CLI syntax, the following
declaration would make it managed:

ref CTestDlg : public CDialog
{
// code
}

If you're writing for Managed Extensions for C++, the declaration is:

__gc class CTestDlg : public CDialog
{
// code
}

Remember that creating a managed version of your class also removes the need
to explicitly delete a created object of this type. Also other programming
qwirks get implied when an unmanaged class is moved to the managed
environment, like the need for a different type of declaration syntax (which
might impose problems if the instance is created by the MFC framework). This
means, in english that if you use the doc/view architecture of MFC, you must
create and upkeep the doc/views manually, because MFC isn't a managed
framework.

Hope this helps,
-Antti Keskinen

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