DOCUMENT:Q239096  08-MAY-2002  [exchange]
TITLE   :PRB: Problems with CoInitializeEx and CDO
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:kbCDO kbDSupport exc55

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

Collaboration Data Objects (CDOs) are not multi-threaded apartment safe. The COM
library has to be initialized as a multi-threaded apartment to make CDO a
multi-threaded apartment. From CDO, the MAPIInitialize function is called, which
in turn calls the CoInitialize(NULL) function. This causes a conflict and the
code fails.

MORE INFORMATION
================

The following sample code fails with error code 0x80040154
(REGDB_E_CLASSNOTREG):

   #define _WIN32_DCOM

   #import <cdo.dll> no_namespace

   #include <stdio.h>
   #include <assert.h>
   #include <tchar.h>
   #include <objbase.h>

   #pragma message ("TO DO: change RECIPIENT_NAME to your emailid")
   #define RECIPIENT_NAME "jack@microsoft.com"

   void dump_com_error(_com_error &e)
   {
       _tprintf(_T("Oops - hit an error!\n"));
       _tprintf(_T("\a\tCode = %08lx\n"), e.Error());
       _tprintf(_T("\a\tCode meaning = %s\n"), e.ErrorMessage());
       _bstr_t bstrSource(e.Source());
       _bstr_t bstrDescription(e.Description());
       _tprintf(_T("\a\tSource = %s\n"), (LPCTSTR) bstrSource);
       _tprintf(_T("\a\tDescription = %s\n"), (LPCTSTR) bstrDescription);
   }

   struct StartOle {
       StartOle()  {
            CoInitializeEx(NULL,COINIT_MULTITHREADED) ;	
       }

       ~StartOle() {
            CoUninitialize();
       }
   } _inst_StartOle;

   void main()
   {
       try {
   	
           SessionPtr pSession("Mapi.Session");
           pSession->Logon("Microsoft Outlook");

           FolderPtr   pFolder = pSession->Outbox;
           MessagesPtr pMessages = pFolder->Messages;
           MessagePtr  pMessage = pMessages->Add();
           pMessage->Subject = "VCCOM: MAPI Example";
            
           RecipientsPtr pRecipients = pMessage->Recipients;
           RecipientPtr pRecipient = pRecipients->Add();
           pRecipient->Name = RECIPIENT_NAME;
           pRecipient->Type = (long) mapiTo;
           pRecipient->Resolve();

           pMessage->Send(false, false);
           pSession->Logoff();

           } 

   catch (_com_error &e) {
           dump_com_error(e);
       }
   }

Workaround
----------

To solve the problem, change the following registry key from Both to Apartment:

   

   HKEY_CLASSES_ROOT\CLSID\{3FA7DEB3-6438-101B-ACC1-00AA00423326}\InprocServer32\ThreadingModel

REFERENCES
==========

For additional information, click the article number below to view the article
in the Microsoft Knowledge Base:

   Q239853 MAPI_NO_COINIT Flag To Make MAPIInitialize Not Call CoInit

Additional query words: CDO CoInitializeEx 0x80040154 multithreaded

======================================================================
Keywords          : kbCDO kbDSupport exc55 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
Issue type        : kbprb
Solution Type     : kbfix

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