Qt4-preview-feedback Archive, April 2007
QApplication::sleep() missing
Message 1 in thread
Hi,
as I said for Qt3, a sleep function for QApplication would be really nice.
Sometimes it is really needed to force the whole application to sleep.
A small example: removing files on windows... I think you all know the
message "Cannot remove folder, folder not empty"? On this OS, you have to try
to remove the file until no error message appears, and a sleep between
attempts seems to better than to try to remove in each cycle...
The same thing with renaming.
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Message 2 in thread
Hello,
On Thursday 19 April 2007 09:36, J. Preiss wrote:
> as I said for Qt3, a sleep function for QApplication would be really nice.
> Sometimes it is really needed to force the whole application to sleep.
>
> A small example: removing files on windows... I think you all know the
> message "Cannot remove folder, folder not empty"? On this OS, you have to
> try to remove the file until no error message appears, and a sleep between
> attempts seems to better than to try to remove in each cycle...
> The same thing with renaming.
I suggest using a QTimer. Sleeping is dangerous, because your application
won't be redrawn, the entire process will just seem dead for a while.
FYI: QTestLib has qWait and qSleep. The implementation is quite small, so you
can rip it out and put in your project.
Best regards,
Harald
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Message 3 in thread
On Friday 20 April 2007 17:02:51 Harald Fernengel wrote:
> Hello,
>
> On Thursday 19 April 2007 09:36, J. Preiss wrote:
> > as I said for Qt3, a sleep function for QApplication would be really
> > nice. Sometimes it is really needed to force the whole application to
> > sleep.
> >
> > A small example: removing files on windows... I think you all know the
> > message "Cannot remove folder, folder not empty"? On this OS, you have to
> > try to remove the file until no error message appears, and a sleep
> > between attempts seems to better than to try to remove in each cycle...
> > The same thing with renaming.
>
> I suggest using a QTimer. Sleeping is dangerous, because your application
> won't be redrawn, the entire process will just seem dead for a while.
With a QTimer, I have to use a slot, which does not work... I have to wait
until a file is correctly remove, for example. My cases are only
millisecond-things.
We have one interface, where I have to write a file and wait for another file
for the answer. Now would it be useul to have a sleep command between two
seacrhes for the answer. And no, using a slot is *not possible*!
> FYI: QTestLib has qWait and qSleep. The implementation is quite small, so
> you can rip it out and put in your project.
Yes, I now. Its one #ifdef with one Sleep and one msleep or usleep. Maybe I'll
pack it in my own library... :-(
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Message 4 in thread
On Friday 20 April 2007 18:29:30 J. Preiss wrote:
> On Friday 20 April 2007 17:02:51 Harald Fernengel wrote:
> > FYI: QTestLib has qWait and qSleep. The implementation is quite small, so
> > you can rip it out and put in your project.
>
> Yes, I now. Its one #ifdef with one Sleep and one msleep or usleep. Maybe
> I'll pack it in my own library... :-(
Alternatively, you could subclass QThread to make the msleep() function public
access (instead of just protected).
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