> I found that CALLBACK_PROLOGUE and CALLBACK_EPILOGUE
> makes most programs less, not more, stable. The simple
> program below crashes when it calls FrmCloseAllForms.
>
> It does not crash if I comment CALLBACK_PROLOGUE and
> CALLBACK_EPILOGUE.
>
> Can somebody explain why?
>
> Boolean MainFormHandleEvent(EventPtr event) {
> CALLBACK_PROLOGUE
> switch (event->eType) {
> case frmOpenEvent: // after the form is opened, draw it
> FrmDrawForm(FrmGetActiveForm());
> return 1;
> default: break;
> }
> return 0;
> CALLBACK_EPILOGUE
> }
no bug.. just careless programming.. :) think about the steps
in your code!
---
{
Boolean processed;
CALLBACK_PROLOGUE
....
CALLBACK_EPILOGUE
return processed;
}
---
you have TWO returns, both of which fail to execute the
"EPILOGUE" - hence, it is NOT fixing the registers a4 and a5.
hence = crash.
the reason why it works without is simple.. you are not touching
any global variables.. if you had a global, and used it.. it
would crash.
:) good programming practive = 1 return in functions, that way,
you can spot errors like this! :)
cheers.
az
--
Aaron Ardiri
Lecturer http://www.hig.se/~ardiri/
University-College i G�vle mailto:[EMAIL PROTECTED]
SE 801 76 G�vle SWEDEN
Tel: +46 26 64 87 38 Fax: +46 26 64 87 88
Mob: +46 70 352 8192 A/H: +46 26 10 16 11
