BUG: Memory Problems with Simple Mapi

ID: Q169680

The information in this article applies to:

Microsoft Exchange Server, version 5.0
Microsoft Exchange Server, version 4.0

SYMPTOMS

When writing an application that uses simple MAPI you may encounter Memory leaks.

CAUSE

Repeated calls to MAPILogoff() within the same application may result in a significant memory leaks. An example would be if a programmer designed an application that needed to periodically poll for new messages. A poorly optimized algorithm would appear like this:

   Do Until Something
   MAPILogon()
   MAPIResolveName()
   MAPIFindNext()
   MAPIFreeBuffer()
   MAPILogoff()
   Sleep()
   Loop

RESOLUTION

Instead you should Cache the MAPI Session, changing the example to this:

   MAPILogon()
   MAPIResolveName()
   Do Until Something
   MAPIFindNext()
   Sleep()
   Loop
   MAPILogoff()

You could also use Extended MAPI to avoid this problem.

Keywords          : SMapiCMC 
Version           : 4.0 5.0
Platform          : IDEAS WINDOWS
Issue type        : kbbug

Last Reviewed: July 26, 1997