AfxMessgeBox "eats" thread messages

I have a CWinThread derived class that implements a thread with a message queue.  Other threads post thread messages (hWnd = NULL) to this thread using PostThreadMessage().  Normally everything works fine, but if this thread displays a message box, any thread messages that are posted to it while the message box is displayed, are lost.  Is this the way things should work?  Is there a way not to lose the messages posted while the message box is displayed?
boreillyAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Tommy HuiEngineerCommented:
Yes, because it uses its own internal message loop to display the message box. Normally, you do not want to have a worker thread displaying UI objects. If you need this capability, the better thing to do is to not use anything that can bring up its own message loop (i.e. MessageBox or AfxMessageBox). Instead, use a modeless dialog, and if you're using Visual C++ 5.x, then you can also use modal dialogs.


0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
boreillyAuthor Commented:
I would like to give a grade of excellent, but the wording of the answer is not perfectly clear to me.  When you say "Yes, because it uses its own internal message loop", does "it" refer to MessageBox()?  Are you saying that the messagebox functions implement their own message loops? Do they intercept all messages to the thread?

Thank you very much.
Bruce
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Programming

From novice to tech pro — start learning today.