"gianluca" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
hy,
I've a huge problem with ctypes. I've compiled my C library and I'd
like use it in python with ctype. One function need to pass a pointer
to typed ( like this: typedef int value_type). In python I can access
to that funtion but arise an exception because python don't know my
value_type typedef.
Please I need help, could anybody help me?
Gianluca
Let's see if I understand you correctly. You have a typedef, and a function
that is passed a pointer to that typedef. Below is a short Windows DLL,
compiled with "cl /LD example.c"
typedef int value_type;
__declspec(dllexport) void function(value_type* x)
{
*x *= 2;
}
And here is some python code to call it:
from ctypes import *
value_type = c_int # declares a type "value_type"
as a ctypes integer
value=value_type(5) # create an instance of value_type
function=cdll.example.function # look up the function and declare
return type and arguments
function.restype=None
function.argtypes=[POINTER(value_type)]
function(pointer(value)) # call the function with a pointer
to the instance
value
c_long(10)
Hope that helps.
-Mark
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