Tim Rau <[EMAIL PROTECTED]> wrote in news:0104616d-87be-4250-b3ef- [EMAIL PROTECTED] com:
> On Jan 26, 1:41 am, John Machin <[EMAIL PROTECTED]> wrote: >> On Jan 26, 4:20 pm, Tim Rau <[EMAIL PROTECTED]> wrote: >> >> >> >> > Traceback (most recent call last): >> > File "C:\Documents and Settings\Owner\My Documents\NIm's >> > code\sandbox >> > \sandbox.py", line 242, in <module> >> > player = ship() >> > File "C:\Documents and Settings\Owner\My Documents\NIm's >> > code\sandbox >> > \sandbox.py", line 121, in __init__ >> > self.phyInit() >> > File "C:\Documents and Settings\Owner\My Documents\NIm's >> > code\sandbox >> > \sandbox.py", line 147, in phyInit >> > moi = cp.cpMomentForCircle(self.mass, .2, 0, >> > vec2d((0,0))) >> > ArgumentError: argument 4: <type 'exceptions.TypeError'>: >> > expected vec2d instance instead of vec2d >> >> > As far as I can tell, It's getting a vec2d, and it wants a >> > vec2d. I't seems like it doesn't know what it wants, but I >> > thought only teenagers did that, no programming languages. >> >> It possibly means that it is expecting an instance of a class >> whose name is "vec2d" but you have given it an instance of >> some *other* class whose name just happens to be "vec2d". >> >> > clearly, Im missing something. >> >> Yes, some information: >> 1. what is vec2d, class or function? >> 2. what do you believe vec2d((0, 0)) should return? >> 3. what is this belief based on? >> 4. what has it actually returned this time? >> 5. what do you believe that cp.cpMomentForCircle expects as >> argument 4? >> 6. what is this belief based on? >> >> The ArgumentError exception is raised by ctypes "when a foreign >> function call cannot convert one of the passed arguments". >> Based on guessin'n'googlin' the cp thing is a set of Python >> bindings to a library written in C++ ... have you considered >> asking the author of the bindings? > > 1. vec2d is a class, designed to hold and manipulte 2d vectors > 2. it should return a vector with x=0 and y=0 > 3. That's what it's done before. > 4. trying it in the interpreter seems to show that it returns a > vec2d with zero length. as it should. > 5.cp.cpMomentForCircle seems to expect a vec2d. I'm baseing that > on a functioning demo that uses the exact same line. > > I guess that the vec2d I've got is not the one it wants. How do > I tell the difference? I'll go look at all the imports. > Are you passing the class or an instance of the class? I'd bet the former, but it should be the latter. -- rzed -- http://mail.python.org/mailman/listinfo/python-list
