On Thursday 08 March 2007 8:40 am, Matt Newell wrote: > On Thursday 08 March 2007 00:07, Ulrich Berning wrote: > > [EMAIL PROTECTED] wrote: > > >Eh, I have just realized that I have replied directly to Phil Thompson, > > > not to this list (this is because I have used unfamiliar webmail > > > client). So this is our conversation: > > > > > >*** Me: *** > > >You can look at that example by Zack Rusin, it is very simple, here is > > > code: http://ktown.kde.org/~zrusin/examples/argb.tar.bz2 (look at > > > main.cpp) > > > > > >That Display instance come directly from xlib, it is created by > > > XOpenDisplay: http://lxr.freedesktop.org/ident?i=XOpenDisplay > > > > > >In Python, I am using ctypes module to directly access xlib (libX11) > > >and call XOpenDisplay. > > > > > >*** Phil: *** > > >I meant, in the context of PyQt. PyQt needs to know about the type. > > > > > >*** Me: *** > > >I can't help you much in this, I don't know much about ctypes, I have > > > only learned it because I want to create ARGB windows with PyQt (and > > > then I realized that I can't do it because PyQt doesn't support it). > > > But you can try this code: > > > > > >### Python code ### > > >import ctypes > > > > > >class Display(ctypes.Structure): > > >pass > > > > > >xlib = ctypes.CDLL('libX11.so.6') > > >xlib.XOpenDisplay.restype = ctypes.POINTER(Display) > > >xlib.XOpenDisplay.argtypes = [ctypes.c_char_p] > > > > > >display = xlib.XOpenDisplay(':0.0') > > >### End of Python code ### > > > > > >This will create 'display' object, which is pointer to 'Display' > > > structure (which is derived from standard ctypes.Structure). > > > > > >But this is all I can tell you, as I said I don't know any details about > > > this process, only that it works (I have tried creating window with > > > pure xlib). > > > > > >Ctypes are standard module in python 2.5 (for Python 2.4 it is external > > >module), so I think PyQt should support it. > > > > The ctypes extension doesn't build on AIX, HP-UX, IRIX and Solaris. With > > some changes, it may build on IRIX and Solaris, because libffi has been > > ported to these platforms. On AIX and HP-UX, you have definitely lost. > > I've never understood, why ctypes became a standard module. > > > > PyQt works on the above platforms. Making it dependent on the ctypes > > extension seems to be a bad idea. > > Display is just a pointer. I think PyQt could support accepting a ctypes > pointer as an arguement without depending on ctypes being available. The > ctypes pointer is simply passed as a PyObject * and regular python api > calls are used to check that it is indeed a ctypes pointer, and to get the > value.
Ironically ctypes doesn't provide the necessary C API to do this. However if (in Python) you can get the address of the real data structure as a number (ctypes.addressof() ?) then you can create a sip.voidptr from it and I can add the ctors to accept that. Phil _______________________________________________ PyKDE mailing list [email protected] http://mats.imk.fraunhofer.de/mailman/listinfo/pykde
