InvalidCastException calling Outlook

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Jeff Curren - 16 Apr 2004 22:36 GMT

Additional information: QueryInterface for interface Outlook._Application
failed.

I'm running:
golApp = new Outlook.ApplicationClass();

gnspNameSpace = golApp.GetNamespace("MAPI");

on Windows XP with Outlook 2002.

I've completed the steps described by KB Q309336 and downloaded the Office
Interop libraries from microsoft. The Office dlls are referencing the
downloaded libraries but for some reason the Microsoft.Office.Core library
is still referenced from the original location
(c:\windows\assembly\gac\office\7.0.3300.0__b03f5f7f11d50a3a\office.dll)

I assume the next problem I have to solve to make this work is to coerce the
Microsoft.Office.Core to load from the downloaded libraries but I can't see
how to do that yet.

Any suggestions would be appreciated.

Thanks,
Jeff

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Stuart Fujitani - 17 Apr 2004 06:06 GMT

Jeff

Ensure that the Office XP PIA's are installed into the GAC. Microsoft has strongly named the PIA's and marked them as the primary interop assemblies. This ensures that Office objects can be shared between different applications using the same identity.

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Jeff Curren - 18 Apr 2004 13:48 GMT

Thanks for the reply Stuart. I had already registered the PIAs in the GAC as
instructed by the download readme file.

I'm not sure how many of these are necessary to create an
Outlook.ApplicationClass, but my GAC shows the following all pointing to the
PIA folder:

Microsoft.Office.Interop.Outlook
Office
stdole

Here is the entire code my my project:
using System;

using Microsoft.Office.Interop.Outlook;

namespace OutlookTest

{

class Class1

{

[STAThread]

static void Main(string[] args)

{

Microsoft.Office.Interop.Outlook.Application golApp;

Microsoft.Office.Interop.Outlook.NameSpace gnspNameSpace;

golApp = new Microsoft.Office.Interop.Outlook.ApplicationClass();

gnspNameSpace = golApp.GetNamespace("MAPI"); // Exception thrown here

Console.WriteLine("Success");

}

}

}

> Jeff,
>
> Ensure that the Office XP PIA's are installed into the GAC. Microsoft has strongly named the PIA's and marked them as the primary interop assemblies.

This ensures that Office objects can be shared between different
applications using the same identity.

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InvalidCastException calling Outlook

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