QueryInterface for IID_IMAPIGetSession not working

Question

I'm trying to get the current MAPI session in a wrapped PST provider. From the documentation, is sounds like you need to QueryInterface the provider's MAPI support object. So I do something like

// IID_IMAPIGetSession
DEFINE_GUID(IID_IMAPIGetSession, 0x614ab435, 0x491d, 0x4f5b, 0xa8, 0xb4, 0x60, 0xeb, 0x3, 0x10, 0x30, 0xc6);
...

HRESULT CMSProvider::Logon(IMAPISupport* support, ...)

{

    IMAPIGetSession* session;

    support->QueryInterface(IID_IMAPIGetSession, (void**)&session);

...

The QI fails with E_NOINTERFACE. Any idea what's wrong?

Answer 1

Are you using Outlook 2010?

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Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption
Redemption - what the Outlook
Object Model should have been

Answer 2

Yes. Tried 2007 too with the same results.

It sounds like the IMAPIGetSession interface is one that's available for a service provider to use to get the current session rather than being one that the provider implements for Outlook to use. Does that sound right to you?

Answer 3

I have not tried to use IMAPIGetSession, but yes, that souds right.

Can you try to use IMAPISupport provided in your service entry function instead of IMSProvider::Logon?

 

---

Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption
Redemption - what the Outlook
Object Model should have been

Answer 4

I tried ServiceEntry and got the same result. So either the documentation is wrong or I'm not using it correctly.

Answer 5

support->QueryInterface(&IID_IMAPIGetSession, (void**)&session);

Answer 6

That won't compile. Neither will

support->QueryInterface(&IID_IDispatch, (void**)&session);

but

support->QueryInterface(IID_IDispatch, (void**)&session);

does.

Answer 7

Hi Chunk,

What is the status of the problem on your side? If you still need any assistant about the problem, I will involve some one who are more familiar about this.

Best Regards,

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Bruce Song [MSFT]
MSDN Community Support | Feedback to us
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Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 8

Nothing has changed. I still can't do a IMAPISupport::QueryInterface for IID_IMAPIGetSession. I would greatly appreciate any help you can give.

Thanks

Chuck

Answer 9

Sorry - I was looking at some C code for reference - should have looked at C++. As far as I can tell, your QI should have worked. You may want to open a case so we can debug the reason for the failure.

Answer 10

I went ahead and debugged this - it turns out this interface is only available on the support object passed to transport providers through TransportLogon. Address book and message store providers get a different support object which does not support this interface. This is a documentation bug which I will work to get addressed. Sorry for the confusion!

Answer 11

Bad news but thanks. How can a store provider get the session? MAPILogonEx?

Answer 12

I suppose that would work. Typically, a provider shouldn't need to access a MAPI session for the normal course of its work.

Answer 13

You can implement a dummy COM add-in in the same dll, retrieve IMAPISession from Namespace.MAPIOBJECT in OOM and share the session in a global variable.

---

Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption
Redemption - what the Outlook
Object Model should have been

Answer 14

Such a solution would lock your add-in to only working when loaded in-proc with Outlook. MAPI gets used by other applications and such dependencies are discouraged.

Answer 15

True, but it would not be any worse than the Hotmail provider checking if the parent process name is outlook.exe :-)

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Dmitry Streblechenko (MVP)
http://www.dimastr.com/redemption
Redemption - what the Outlook
Object Model should have been

Answer 16

Touche, but we can always try to do better.