Having trouble using CTypes with a custom function

[tkondal at gmail.com]

Would you have any example of a wrapper for such data types?

Thanks.

Chris Mellon wrote:
> On 4 Oct 2006 11:18:16 -0700, tkondal at gmail.com <tkondal at gmail.com> wrote:
> > Hi all.
> >
> > I just started looking at Python's ctypes lib and I am having trouble
> > using it for a function.
> >
> > For starters, here's my Python code:
> >
> >
> > from ctypes import*;
> > myStringDLL= cdll.LoadLibrary("myStringDLL.dll");
> >
> > GetMyString = getattr(myStringDLL,
> > "?GetMyString@@YA_NAAV?$basic_string at DU?$char_traits at D@std@@V?$allocator at D@2@@std@@@Z")
> >
> > strString =  create_string_buffer('\000' * 256);
> > GetMyString.restype = c_int;
> > GetMyString.argtypes = [c_char_p];
> >
> > bResult = GetMyString (strSerialNumber);
> >
> > print (bResult);
> > print (strSerialNumber);
> >
> > #C++ Prototype of the function I want to call:
> > #bool GetMyString (string& stringParam) ;
> >
> >
> >
> >
> > I do not have access to the source code of this function so don't ask
> > me to try different things in C++.  This DLL is working fine.
> >
> > The problem that I have is that print (strSerialNumber) does not seem
> > to print the correct string.  What I get is some garbage value of
> > unprintable characters.  Am I using this the correct way?
> >
>
>
>
>
> This function is expecting a C++ std::string object, not a regular C
> style string. You'll need a wrapper function, and one which uses the
> same compiler and STL as the C++ source.
>
> > Thanks.
> >
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >