Re: Threads

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 20 Mar 2008 22:25:33 -0400

Message-ID:

<uK8YarviIHA.4712@TK2MSFTNGP04.phx.gbl>

"Z.K." <nospam@nospam.net> wrote in message
news:ePaiLnriIHA.3512@TK2MSFTNGP03.phx.gbl...

I was wondering if someone could tell me how to implement a couple of
threads. I have an MFC application which launches a Command line
application using 4 different commandline arguments. This works fine using
CreateProcess, but I also want to update a progress bar to the amount of
how long the command line application stays active. I created a thread to
update the progress bar and it works, but I can't figure out how to update
the progress bar at the same time that the exernal process is active. The
program always waits until the process is complete before updating the
progress bar. Any help would be appreciated.

Apparently you have stopped your main thread from processing messages while
waiting for the external process to complete. That will prevent updates of
the progress bar. It will also lock up the secondary thread that is
attempting to update the progress bar.

The solution is: don't block the main thread, it should always return soon
to MFC so messages can be processed. If you need a wait or wait loop to
detect external process completion put that in a secondary thread.

--
Scott McPhillips [VC++ MVP]