DOCUMENT:Q163783  10-MAY-1999  [exchange]
TITLE   :XCLN: MAPISendMail Function Fails in 32-bit VB Environment
PRODUCT :Microsoft Exchange
PROD/VER:4.0
OPER/SYS:
KEYWORDS:kbusage

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The information in this article applies to:

 - Microsoft Exchange Windows 95/98 client, version 4.0 
 - Microsoft Exchange Windows NT client, version 4.0 
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SUMMARY
=======

A simple MAPI program written originally in 16-bit VB 3.0 fails on the
MAPISENDMAIL function when the program is recompiled in the 32-bit VB 4.0
environment. The program will produce an error 25 on the MAPISENDMAIL function,
which is an invalid recipient error.

MORE INFORMATION
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The reason for the error is that the way of declaring a 32-bit function in
32-bit Visual Basic 4.0 is different then declaring a 16-bit function in 16-bit
Visual Basic (3.0 or 4.0). Mapi32.dll is expecting a pointer to the Recipient
array instead of the address of the first element.

There is an updated module that corrects this problem. This module contains
updated declares and other necessary procedures for this process to work
correctly in the 32-bit Visual Basic environment. This file is the updated
Mapivb32.bas file. For more information about the availability of this file,
please see the following article in the Microsoft Knowledge Base:

   Q163216 XCLN: Updated Mapivb32.bas for Simple MAPI on 32-Bit Platforms

The following is the correct syntax for the code to call the MAPISendMail
function with the new BAS file:

      RET& = MAPISendMail(hSession&, 0, MailMsg, Recips, NoFile, 0&, 0&)

Additional query words: MAPI sending error 32 bit whoami fails

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Keywords          : kbusage 
Technology        : kbExchangeSearch kbExchangeClientSearch kbZNotKeyword kbZNotKeyword2 kbZNotKeyword3 kbExchange400NT kbExchange400Win95
Version           : 4.0

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