Office.Interop.Outlook accessing sub-folders

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I am writing an application that uses Microsoft Outlook libraries to access some folders. I have a problem where I can open up the namespace and get the default Inbox folder but whenever I try to access the underlying folders I get the error:

[System.Runtime.InteropServices.COMException]	{"Interface not registered (Exception from HRESULT: 0x80040155)"}

I am able to get unreadItemcounts and view the properties of the Inbox. The code that I am using is:

C#

appOutlook = new Outlook.Application();                    
nsOlApp = appOutlook.GetNamespace("MAPI");
nsOlApp.Logon(Type.Missing,Type.Missing, true, true);
// nsOlApp.Logon(Type.Missing, Type.Missing, Type.Missing, Type.Missing);
oFolder = nsOlApp.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);
foreach (Outlook.MAPIFolder fldr in oFolder.Folders)
{
    MessageBox.Show(fldr.Name.ToString());
}

Has anyone else had this problem?

I have registered ole32.dll successfully and must use Outlook libraries as I need to access sub-folders int he inbox for a particular application.

thanks

Posted 16-Jun-13 17:04pm

Narelle Gatti

Updated 17-Jun-13 16:23pm

v3

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Narelle Gatti 17-Jun-13 17:34pm

Sorry - Amit. I missed saying that I require Outlook as I am linking into Microsoft Outlook to write a specific application that looks at sub-folders within outlook.

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_Amy · Answer 1 · 2013-06-16T18:48:00

Following are the checkpoints for this error:

You should be using the Interop.excel.Dll. the Excel.Exe library will give this error. Errors starting with 0x8 are permission errors or invalid pointer to memory.
Go to --> Start --> run --> Enter REGSVR32 OLE32.DLL --> OK
This will show the message : ole32.dll succeeded

--Amit

Narelle Gatti · Answer 2 · 2013-06-17T11:33:00

Solution 3

Hi Amit

Thanks for your response. I have registered ole32.dll successfully and still have the problem. I do think that there is an invalid memory problem but it could be to do with a missing like that instantiates something that I have missed. Any other ideas are really welcome.

Posted 17-Jun-13 11:33am

Narelle Gatti

Comments

Richard C Bishop 17-Jun-13 17:35pm

Do you realize the flaw in the logic of posting a question/comment as a solution to your own question?

Narelle Gatti 17-Jun-13 22:24pm

Sorry first time user.

Richard C Bishop 18-Jun-13 10:13am

It's all good, I just wanted you to think about it and be more mindful of what you are doing rather than ridicule you.