DOCUMENT:Q264526  19-JUL-2001  [sna]
TITLE   :Snaoledb.dll Init Fails with CoInitializeEx Multithreaded
PRODUCT :Microsoft SNA Server
PROD/VER:WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
OPER/SYS:
KEYWORDS:kbSNA400sp4fix kbSNA400PreSP4fix

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The information in this article applies to:

 - Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
 - Microsoft OLE DB Provider for AS/400 and VSAM, versions 4.0 SP2, 4.0 SP3 
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SYMPTOMS
========

If an application thread calls the CoInitializeEx(NULL, CO_MULTITHREADED)
function on a Windows NT 4.0-based computer, the thread may receive the
following error message when it attempts to initialize the OLE DB Provider for
AS/400 and VSAM:

   Initialization of the dynamic link library e:\program
   files\sna\system\snaoledb failed. The process is terminating abnormally.

This problem does not occur on Windows 2000-based computers, or if Apartment
threading is requested.

NOTE: Even though the OLE DB Provider for AS/400 and VSAM only supports the
Apartment-threading model (as documented in the SNA Server SDK online Help topic
"Programming Considerations Using the OLE DB Provider for AS/400 and VSAM"), the
application calling the thread must still be able to initialize the COM
interface using the Multithreaded option.

CAUSE
=====

The OLE DB Provider for AS/400 and VSAM is incorrectly calling OleInitialize,
requiring the calling thread to request Apartment threading.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for SNA Server 4.0. For
additional information, please see the following article in the Microsoft
Knowledge Base:

   Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack



WORKAROUND
==========

If possible, initialize the thread using the Apartment-threading model:

Call CoInitializeEx(NULL, COINIT_APARTMENTTHREADED)

-OR-

Call CoInitialize(NULL)

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Server version
4.0, 4.0 SP1, 4.0 SP2 and 4.0 SP3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.

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

The following sample program can be used to reproduce this problem. In this
sample, the error message occurs when Initialize() is called:

   #define DBINITCONSTANTS
   #define INITGUID
   #define _WIN32_DCOM
   #include <windows.h>
   #include <msdaguid.h>
   #include <oledb.h>
   #include <tchar.h>
   #include <stdio.h>
   #include <assert.h>
   #include <msdasc.h>
   int main ()
   {
           HRESULT            hr                 = S_OK;
   	IDataInitialize    *pIDataInitialize  = NULL;
   	IDBInitialize	   *pIDBInitialize    = NULL;
   	LPOLESTR pwszFileName = SysAllocString (OLESTR("c:\\thor.udl"));

   	LPOLESTR ppwszInitializationString;

   	hr = CoInitializeEx( NULL, COINIT_MULTITHREADED );
   	assert (hr == S_OK);
   	hr = CoCreateInstance(CLSID_MSDAINITIALIZE, NULL, CLSCTX_INPROC_SERVER, IID_IDataInitialize,
   		reinterpret_cast<void **>(&pIDataInitialize));

   	hr = pIDataInitialize->LoadStringFromStorage(pwszFileName, &ppwszInitializationString);

   	hr = pIDataInitialize->GetDataSource(NULL,CLSCTX_INPROC_SERVER, ppwszInitializationString, IID_IDBInitialize, (IUnknown **)(&pIDBInitialize));

   	hr = pIDBInitialize->Initialize();

   	SysFreeString (pwszFileName);
   	SysFreeString (ppwszInitializationString);

   	hr = pIDBInitialize->Release ();	
   	
   	CoUninitialize( );

   	return 0;
   }

NOTE: When you build the project above, make sure to link with the multithreaded
Microsoft C Runtime Library and Msdasc.lib.

Additional query words:

======================================================================
Keywords          : kbSNA400sp4fix kbSNA400PreSP4fix 
Technology        : kbAudDeveloper kbOLEDBSearch kbSNAServSearch kbOLEDBProvAS400VSAM400SP2 kbOLEDBProvAS400VSAM400SP3 kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 kbOLEDBProvSearch
Version           : WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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Copyright Microsoft Corporation 2001.