override.py

class Context(_Ctype):
    """Create a new Context instance.
    """
    def __new__(cls, *args):
        if args:
            i = args[0]
            if i == 0:
                return None
            if isinstance(i, _Ints):
                return _Cobject(cls, ctypes.c_void_p(i))
            elif isinstance(i, basestring):
                # Init from XML file
                p = ctypes.c_void_p()
                err = EnumerationErrors()
                status = dll.xnInitFromXmlFile(i, ctypes.byref(p), err)
                if status:
                    xnPrintError(status, "Context creation")
                    return None
        p = ctypes.c_void_p()
        status = dll.xnInit(ctypes.byref(p))
        if status:
            xnPrintError(status, "Context creation")
            return None
        return _Cobject(cls, p)

class NodeQuery(_Ctype):
    """Create a new NodeQuery instance.

    # FIXME: handle destruction
    """
    def __new__(cls, *args):
        if args and args[0]:
            p = args[0]
        else:
            p = ctypes.c_void_p()
            status = dll.xnNodeQueryAllocate(ctypes.byref(p))
            if status:
                xnPrintError(status, "NodeQuery creation")
                return None
        return _Cobject(cls, p)

class EnumerationErrors(_Ctype):
    """Create a new EnumerationErrors instance.

    # FIXME: handle destruction
    """
    def __new__(cls, *args):
        if args and args[0]:
            p = args[0]
        else:
            p = ctypes.c_void_p()
            status = dll.xnEnumerationErrorsAllocate(ctypes.byref(p))
            if status:
                xnPrintError(status, "EnumerationErrors creation")
                return None
        return _Cobject(cls, p)

class NodeInfoList(_Ctype):
    """Create a new NodeInfoList instance.

    # FIXME: handle destruction
    """
    def __new__(cls, *args):
        if args and args[0]:
            p = args[0]
        else:
            p = ctypes.c_void_p()
            status = dll.xnNodeInfoListAllocate(ctypes.byref(p))
            if status:
                xnPrintError(status, "NodeInfoList creation")
                return None

        return _Cobject(cls, p)