Re: Giving dialog box control back to user during processing?

"AliR \(VC++ MVP\)" <AliR@online.nospam>
Thu, 12 Apr 2007 16:03:38 GMT
According to Joe, it is the dark side. I have posted this type solution
from time to time as an alternative to a worker thread, and got an earful
(eyeful) from Joe.

I use it, I like it and it works. :)


"Tom Serface" <> wrote in message

You know, honesetly I don't know where I got this function originally.
I've had it in my programs for many years. I find it to be a handy way to
handle these kinds of problems. If I'm in your realm, is that the dark


"AliR (VC++ MVP)" <AliR@online.nospam> wrote in message

oh oh Tom is crossing over into my realem. ;)


"Tom Serface" <> wrote in message

A worker thread is a good idea, but if you don't want to go to that
trouble (or if the loop is simple) you can just call a function like:

// Release main thread for background processing
void GiveTime()
    // Idle until the screen redraws itself, et. al.
    MSG msg;
    while (::PeekMessage( &msg, NULL, 0, 0, PM_NOREMOVE ) ) {
     if (!AfxGetThread()->PumpMessage( )) {
    // let MFC do its idle processing
    LONG lIdle = 0;
    while (AfxGetApp()->OnIdle(lIdle++ ))

During the loop to give the message process a chance to jump in.


"Rob" <> wrote in message


I've developed a basic dialog program using the MFC foundation wizard.

Upon pushing one of the buttons, a time consuming processing is
during which the user cannot access the 'Cancel' pushbutton, nor can
processing in question update any fields in the dialog box. It can
the progress bar however.

In order to release the window during this time consuming processing to
allow the user to cancel the processing, do I have to create a separate
thread? Will OnIdol() be a feasible option? Are there any simpler
options that I'm overlooking?


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