MAPI IID_IMessage is unresolved.

[Mike M.]

Visual C 6.0, Windows 2000, Outlook 2003. I am trying to QueryInterface()
on the MAPIOBJECT of a calendar item. When I link my program I get the
following error:
SelectEvents.obj : error LNK2001: unresolved external symbol _IID_IMessage


These are my includes:
#include "stdafx.h"

#define INITGUID
#include <objbase.h>
#define USES_IID_IMessage
#include <mapix.h>
#include <mapitags.h>
#include <mapidefs.h>
#include <mapiutil.h>
#include <mapiguid.h>
#include <imessage.h>

stdafx has altbase.h and the other standard windows include files in it.

This is the line in question:
hr = ptr_Mapi->QueryInterface(IID_IMessage, (void **)&lpIMsg);

What might I be missing to get this to link?

TIA

 

[Dmitry Streblechenko \(MVP\)]

You need to include
#define USES_IID_IMessage

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

 

[Mike M.]

I also needed to have the includes in the "exact" correct order. I Googled
and found a post that helped out.

Thanks.