Re: [Pyobjc-dev] NSApplicationMain idiom: wish to standardize

[Jack J. <Jac...@cw...>]

On Thursday, Mar 20, 2003, at 15:23 Europe/Amsterdam, Just van Rossum 
wrote:

> I've been using the following idiom to enter the Cocoa main event loop 
> for
> some time now:
>
>
> def unexpectedErrorAlert():
>     exceptionInfo =
> traceback.format_exception_only(*sys.exc_info()[:2])[0].strip()
>     return NSRunAlertPanel("An unexpected error has occurred",
>             "(%s)" % exceptionInfo,
>             "Continue", "Quit", None)
>
>
> mainFunc = NSApplicationMain
> args = (sys.argv,)
> while 1:
>     try:
>         mainFunc(*args)
>     except:
>         traceback.print_exc()
>         if not unexpectedErrorAlert():
>             break
>         mainFunc = NSApp().run
>         args = ()
>     else:
>         break

Just,
I modified this a bit, by putting everything, including all needed 
imports,
into a main() program. Also, in stead of printing the traceback before 
calling
unexpectedErrorAlert() I call raise in stead of break, this keeps the 
console
log clean if the user decides to continue and it also enables debugging 
with the
standard trick of setting PYTHONINSPECT=1 before you run your program, 
and then
doing "import pdb; pdb.pm()" after the program has crashed.

Here it is:
def main():
     from AppKit import NSApplicationMain, NSRunAlertPanel, NSApp
     import traceback
     import sys
     def unexpectedErrorAlert():
         exceptionInfo = 
traceback.format_exception_only(*sys.exc_info()[:2])[0].strip()
         return NSRunAlertPanel("An unexpected error has occurred",
                 "(%s)" % exceptionInfo,
                 "Continue", "Quit", None)


     mainFunc = NSApplicationMain
     args = (sys.argv,)
     while 1:
         try:
             mainFunc(*args)
         except:
             if not unexpectedErrorAlert():
                 raise
             mainFunc = NSApp().run
             args = ()
         else:
             break

if __name__ == '__main__':
     main()
--
Jack Jansen, <Jac...@cw...>, http://www.cwi.nl/~jack
If I can't dance I don't want to be part of your revolution -- Emma 
Goldman