> From: Dominik Vogt <dominik.vogt_at_gmx.de>
> Date: Tue, 13 Aug 2002 00:57:34 +0200
> On Mon, Aug 12, 2002 at 06:35:09PM +0100, John Latham wrote:
> > I have a function that used to work under 2.2, but does not under 2.4.8 nor
> > 2.5.2. It is part of a window print capture form:
> >
> > *CaptureButton continue "Capture" ^M
> > *CaptureCommand CaptureCommand "$(file)" "$(Options)"
> >
> > AddToFunc CaptureCommand
> > + "I" Current [Capture] Iconify
> > + "I" PipeRead "exec xwd -out \"$0\" $1"
> > + "I" Prev [Capture] Iconify
> >
> > A message from xwd complains that it cannot grab the mouse. It works fine if I
> > use an Exec instead of PipeRead, except for the obvious timing: I want the
> > Capture form to disappear while I grab the window image.
> >
> > If there is a good reason for PipeRead being less liberal with X resources
> > than Exec is,
> That's necessary to display the watch cursor while a function
> executes. Unfortunately we missed the implications about starting
> applications that need to grab the mouse and forgot to mention it
> in big bold letters in the NEWS and man page.
Ah -- of course, I should have guessed.
> > would it be feasible to offer a version of Exec that does not
> > start a separate thread / process? Or, to offer a WaitExec
> > command that waits for the most recently started Exec?
> You mean "starts the process syncronously". This has been
> discussed a few times. The solution is PipeRead again.
Yes, I agree again, now that I understand the problem is merely about the
cursor, because it would happen during a ``WaitExec'' anyway.
> Try this:
>
> AddToFunc CaptureCommand
> + I BusyCursor read off
> + I Current (Capture) Iconify
> + I PipeRead "exec xwd -out \"$0\" $1"
> + I Prev (Capture) Iconify
> + I BusyCursor read on
I have tried this but it does not work. :-( I had not switched on BusyCursor
for read anyway -- off by default -- so no surprise. I guess the read /
PipeRead code currently grabs the mouse even if BusyCursor read is off. I
shall continue to anticipate a fix in time for 2.6, and use Exec instead for
this function, for FVWM 2.4 and 2.5 in AnotherLevelUp. ;-)
> Bye
> Dominik ^_^ ^_^
Best wishes, John Latham
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Received on Tue Aug 20 2002 - 09:41:36 BST