On 05-Nov-97 Steve Lamont wrote:
>I suspect the source of your problem is trying to do *anything* other
>than set a flag from within a signal handler. Making Xlib calls (or
>XForms calls, which are merely sophisticated wrappers around Xlib
>calls) is the Kiss of Death[tm]. X is not reentrant and making an X
>call from an interrupted X call will cause the sort of bogosity you
>experience.
>
>You can do the same thing by either using an idle callback (see
>fl_idle_callback() and fl_set_idle_delta()), by using a timeout
>(fl_add_timeout()), or by registering a signal handler
>(fl_add_signal_callback()).
>
>I list those in more or less my own order of preference. I'd probably
>use the idle callback if I had no other idle tasks I needed to perform
>in the application.
>
> spl
Thank you for the quick (and understandable!) answer Steve,
i changed the code as you said to the following:
int redraw() !! nothing important changed here !!
{
sscanf((char *)datum(),"%*s %s %d %s %d",monat,&tag,time_string,&jahr);
sscanf((char *)time_string,"%d:%d:%d", &stunde_start, &minute_start, &sekunde
_start);
monat_int=make_month(monat);
printf("Pointer-Value: %d\n",MainForm->dimension_choice);
calculate(julian(tag,monat_int,jahr),
julian(17,12,1997),
stunde_start, minute_start, sekunde_start,
11, 25, 00,
(char *)fl_get_choice_text(MainForm->dimension_choice),
(char *)output);
fl_hide_object(MainForm->output_field);
fl_set_object_label(MainForm->output_field,output);
fl_show_object(MainForm->output_field);
return(0);
}
and in main():
fl_set_idle_callback(redraw,0);
fl_set_idle_delta(1000);
obj=fl_do_forms();
I hope that is what you meant, but I'm sorry to say that it still doesn't work.
But OK, I'm getting a little closer, at least I think so.
See, I added a line in redraw ():
printf("Pointer-Value: %d\n",MainForm->dimension_choice);
so what happens is just what I wrote in the first mail. Everything works fine.
Output all right, depending on the choices you make.
the printf outputs say a
134636775
134636775
>.
>.
>.
BUT
Touching a key on the active Window results in the mentioned segmentation fault
AND the last output of the printf was say
2
That's it! The program just lost the pointer, somewhere, somehow. I've got still
no idea what happens.
Perhaps I should say that I "made" the form using the fdesign and importing the
.h file while linking everything together with something like
all: ToGo
ToGo: ToGo.o ToGo_design.o Julian.o
@echo "Linking ToGo ... "
gcc $(GCCOPT) $(GCCLIB) -o ToGo ToGo.o ToGo_design.o Julian.o
I checked the demos that come with the XForms but none of them does it that way,
in these, everything is in the .c-file, could that be the point?
I'm sorry not be able to give more information, perhaps someone got some hints.
TIA
best regards
Bjoern
E-Mail: Bjoern Fuerst <fuerst@kph.uni-mainz.de>
Date: 05-Nov-97
Time: 18:56:28
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