User Friendly Error Messages With Python Api

[nihilists]

The following Maya command xform when passed an invalid flag displays a detailed error:

CODE
cmds.xform(who=[3,4,3])
# Error: Invalid flag: who
# Traceback (most recent call last):
#   File "", line 1, in
# TypeError: Invalid flag: who #

With the same command, but passing the wrong argument also displays a detailed error:

CODE
cmds.xform(t=[3,4,'doctor'])
# Error: Invalid arguments for flag 't'.  Expected ( distance, distance, distance ), got [ int, int, str ]
# Traceback (most recent call last):
#   File "", line 1, in
# TypeError: Invalid arguments for flag 't'.  Expected ( distance, distance, distance ), got [ int, int, str ] #

Trying to reproduce the error Message in Python when creating a custom command using OpenMayaMPx.MPxCommand. The following line causes the error when passing the wrong argument/flag:

CODE
OpenMaya.MArgDatabase(self.syntax(), args)

Can't seem to catch the results of the error to display a detailed message to the user.

Is it possible to display a detailed error message for a custom Python command or is it a C++ thing?

-Nihilists

[joojaa]

you have 2 non related issues. the error is generated by python interpretter not maya.

QUOTE(Nihilists @ 03/06/09, 06:34 PM) [snapback]302446[/snapback]
Is it possible to display a detailed error message for a custom Python command

no, not with arg databases

QUOTE
or is it a C++ thing?

no its a feature of using arg database. You can either teach maya to use only the flags you define and maya will handle it exactly like above OR you can parse the args manually in wich case you can spit whatever error you want.

its either or. If you dont do the work you diont have the acces to raw values and errors