IMapiSession exception: Specified cast is not valid

I'm using Mapi33... trying to get IMapiSession reference using the code
below...

IntPtr iunknownPtr =
Marshal.GetIUnknownForObject(m_OutlookApp.Session.MAPIOBJECT);
IMAPISession imapiSession = (IMAPISession)iunknownPtr;

where m_OutlookApp is an instance of Application from MS.Office.InterOp...

When I run this code inside Outlook via Addin passing m_OutlookApp from
OnConnection... it runs fine,

when I run it from command app, passing an instance of m_OutlookApp using
new Application() I get:

System.InvalidCastException was caught Message="Specified cast is not
valid."

Any idea why or a workaround on how to get an IMapiSession reference from
command line app?

Thanks in advance

Did you call MAPIInitialize on that thread?

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-
"skycloud" <skycloud.TakeThisOut@discussions.microsoft.com> wrote in message
news:F2F28A20-3D10-4CDF-B5E4-0EC64440E390@microsoft.com...
> I'm using Mapi33... trying to get IMapiSession reference using the code
> below...
>
> IntPtr iunknownPtr =
> Marshal.GetIUnknownForObject(m_OutlookApp.Session.MAPIOBJECT);
> IMAPISession imapiSession = (IMAPISession)iunknownPtr;
>
> where m_OutlookApp is an instance of Application from MS.Office.InterOp...
>
> When I run this code inside Outlook via Addin passing m_OutlookApp from
> OnConnection... it runs fine,
>
> when I run it from command app, passing an instance of m_OutlookApp using
> new Application() I get:
>
> System.InvalidCastException was caught Message="Specified cast is not
> valid."
>
> Any idea why or a workaround on how to get an IMapiSession reference from
> command line app?
>
> Thanks in advance