Sketch on Windows

[Joonas Paalasmaa]

Hello all,

I have managed to build all sketch's C extension modules using MSVC++ but I
still have some problems running the modules. At least the Trafo function of
the _sketch module crashes. 

I tested the Trafo function using the script below. I set a breakpoint in
sktrafo_sktrafo() to see if the problem occurs inside the function. Python
crashed, a bit after sktrafo_sktrafo() was called, in gcmodule.c's
visit_decref(), because there was an access violation there. Isn't it a bug
in Python if ann access violation happens there? 

import imp
_sketch = imp.load_dynamic( "_sketch", 
r"C:\sketch\sketch-head\sketch\Sketch\_sketch.pyd")
Identity = _sketch.Trafo(1, 0, 0, 1, 0, 0) 

Is there something about Sketch that makes it difficult to make it work on
Windows? The CVS version i compiled uses GTK2 which should be supported on 
Windows. 

Sketch didn't compile out of the box using MSVC++, so I made the following 
changes to
sktrafo.c and to many other files (see
http://www.python.org/cgi-bin/faqw.py?req=show&file=faq03.024.htp ): 

Added to SKTrafo_FromDouble:
#if ( __WIN32__ || _WIN32 )
  self->ob_type = &PyType_Type;
#endif 

Added just after "PyTypeObject SKTrafoType = {":
#if ( __WIN32__ || _WIN32 )
        PyObject_HEAD_INIT(NULL)
#else
        PyObject_HEAD_INIT(&PyType_Type)
#endif 



- Joonas