KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q128575: PC MAPI: MAPI32.DLL Does Not Support Multi-Threaded Call

Article: Q128575
Product(s): Microsoft Mail For PC Networks
Version(s): WINDOWS:3.0,3.2
Operating System(s): 
Keyword(s): 
Last Modified: 30-OCT-1999

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Mail for PC Networks, versions 3.0, 3.2 
-------------------------------------------------------------------------------

SUMMARY
=======

MAPI32.DLL, the dynamic-link library for 32-bit Messaging Application Program
Interface (MAPI) calls, is a component of Windows NT Mail that functions as a
client for a Microsoft Mail for PC Networks postoffice. However, MAPI32.DLL does
not support multi-threaded calls.

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

Developers may use MAPI32.DLL, much like the 16-bit MAPI.DLL found in Microsoft
Mail for Windows, by making 32-bit calls from the application they are
designing. Developers may call from the 32-bit application directly, or from
16-bit calls that subsequently get converted (thunked) to 32-bit calls via the
MAPI.DLL thunking layer that is also provided with Windows NT Mail. However,
when making calls directly to MAPI32.DLL a single thread must be used from the
calling application. MAPI32.DLL does not support applications that make
multi-threaded calls, although multiple processes are supported.


Additional query words: 3.00 3.20

======================================================================
Keywords          :  
Technology        : kbMailSearch kbZNotKeyword3 kbMailPCN320 kbMailPCN300
Version           : WINDOWS:3.0,3.2

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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.