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//usr/lib/python2.4/site-packages/ctypes/test/test_objects.pyc
mò šóIFc @ s d Z d k Z d k Z d k Z d k Z d e i f d „ ƒ YZ e d j o+ e i d j o e i e i i ƒ q{ n d S( s3 This tests the '_objects' attribute of ctypes instances. '_objects' holds references to objects that must be kept alive as long as the ctypes instance, to make sure that the memory buffer is valid. WARNING: The '_objects' attribute is exposed ONLY for debugging ctypes itself, it MUST NEVER BE MODIFIED! '_objects' is initialized to a dictionary on first use, before that it is None. Here is an array of string pointers: >>> from ctypes import * >>> array = (c_char_p * 5)() >>> print array._objects None >>> The memory block stores pointers to strings, and the strings itself assigned from Python must be kept. >>> array[4] = 'foo bar' >>> array._objects {'4': 'foo bar'} >>> array[4] 'foo bar' >>> It gets more complicated when the ctypes instance itself is contained in a 'base' object. >>> class X(Structure): ... _fields_ = [("x", c_int), ("y", c_int), ("array", c_char_p * 5)] ... >>> x = X() >>> print x._objects None >>> The'array' attribute of the 'x' object shares part of the memory buffer of 'x' ('_b_base_' is either None, or the root object owning the memory block): >>> print x.array._b_base_ # doctest: +ELLIPSIS <ctypes.test.test_objects.X object at 0x...> >>> >>> x.array[0] = 'spam spam spam' >>> x._objects {'0:2': 'spam spam spam'} >>> x.array._b_base_._objects {'0:2': 'spam spam spam'} >>> Nt TestCasec B s% t Z e i d j o d „ Z n RS( Ni c C s t i t i i ƒ d S( N( t doctestt testmodt ctypest testt test_objects( t self( ( t< /usr/lib/python2.4/site-packages/ctypes/test/test_objects.pyR A s ( t __name__t __module__t syst hexversionR ( ( ( R R = s t __main__i ( t __doc__t unittestR R t ctypes.test.test_objectsR R R R R R R ( R R R R R ( ( R t ?7 s