Re: [ctypes-users] Ctypes error

[Thomas H. <th...@py...>]

mna...@ai... writes:

> Hi,
> 
> Yes that was the problem. It doesn't work in older versions, and right now
> I am using 0.4. But I was a little reluctant to load the new version
> because I had everything working "just right" and didn't want to throw off
> the balance it has taken me so long to achieve.
> 
> So I decided to try it on a different computer. I set up my configuration
> and downloaded the new version. When I ran my script I got this error.
> 
> TypeError: has no _stginfo_
> 
> The error was in reference to this piece of code.
> 
> class U64(Structure):
>     _fields_ = [("high", "c_ulong"),
>                 ("low", "c_ulong")]
> 

Correct would be this (without the quotes around c_ulong):

class U64(Structure):
    _fields_ = [("high", c_ulong),
                ("low", c_ulong)]

Of course you have to 'from ctypes import c_ulong' first,
but now it's also safe to do 'from ctypes import *'.

> >> I was simply following the example given on the website and received the
> >> following error:
> >>
> >> >>> ii = TenIntegers(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
> >> Traceback (most recent call last):
> >>   File "<pyshell#32>", line 1, in ?
> >>     ii = TenIntegers(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
> >> TypeError: wrong type

IIRC, in ctypes 0.4 you would have to write
     ii = TenIntegers(c_int(1), c_int(2), c_int(3))

Thomas