[This might be a double posting, if it isn't my previous post was lost] Look up "restype" in the ctypes library - it sets the return type from a function. You may want to set it to c_void_p of something similar, instead of the default int.
I made a similar discovery in my blog - http://www.pererikstrandberg.se/blog/index.cgi?page=PythonCansiCombo . This example loads the function find_root from the dll root_find_lib.dll into the variable "find". the restype of find is then set to a c_double. This means that the item returned from C is a C_double and not the default int. root_find_lib = windll.LoadLibrary("root_find_lib.dll") find = root_find_lib.find_root find.restype = c_double You may already know this but 243666016 == 0E860C60 in different bases. HTH, Per [:)]-|--< -- Per Erik Strandberg .NET Architect - Optimization Tomlab Optimization Inc. http://tomopt.com/tomnet/ On 14 Apr, 19:25, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: > Hi, > > I'm working under mac os x with the OpenCV-library that I load viactypes. > > From a ObjectiveC-methodcall I get an integer, that "really" is a > pointer to an IplImage-structure. > > I've got a function that takes such a pointer. But I don't find a way to > pass it to that very function. > > These are the relevant parts of my code: > > cvImage = self._f.cvImage() > print "Address of IplImage: %x" % cvImage > cvImage = c_void_p(cvImage) > print cvImage > cvImage2 = macopencv.cvCloneImage(cvImage) > > The output is > > 2007-04-14 19:22:53.910 SequenceGrabberTest[5320] Returning IplImage at > Address of IplImage: e860c60 > e860c60 > c_void_p(243666016) > 2007-04-14 19:22:53.915 SequenceGrabberTest[5320] Exception raised > during posting of notification. Ignored. exception: > exceptions.ValueError: depythonifying 'pointer', got 'int' > > The first line is actually from the ObjectivC-method, a log-statement. > > As one can see, the pointer is passed back as integer. > > But then I'm stuck. > > Any suggestions would be appreciated! > > diez -- http://mail.python.org/mailman/listinfo/python-list
