Solved

How to avoid "Illegal to call out while in message filter"

Posted on 1998-05-01
2
2,515 Views
Last Modified: 2012-05-04
I have a VB app calling methods in an object created in an .EXE automation server (written in C++ MFC).  Two different VB forms are accessing two different objects in the same .EXE server.  In general, things work fine, but I seem to get occasional collisions when both VB forms are accessing the server and one reports an automation error 0x8001005 ("Illegal to call out while inside message filter").  The one reporting the error is being wakened by a timer to make periodic calls (which work most of the time).  How is this caused and can it be avoided?
0
Comment
Question by:dho050198
2 Comments
 
LVL 6

Expert Comment

by:anthonyc
ID: 1436500
sounds like a threading problem in the C++
0
 
LVL 2

Accepted Solution

by:
woka earned 100 total points
ID: 1436501
Check out articles Q176399 and Q138063 in the Microsoft knowledge base for some enlightenment about timers and the windows message queue and RPC in out of process servers.  You can use the timer, but you have to set some flags to avoid re-entrancy.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
Article by: Martin
Here are a few simple, working, games that you can use as-is or as the basis for your own games. Tic-Tac-Toe This is one of the simplest of all games.   The game allows for a choice of who goes first and keeps track of the number of wins for…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now