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  • Committer: matobet at gmail
  • Date: 2010-06-26 14:11:04 UTC
  • Revision ID: matobet@gmail.com-20100626141104-k011ofmltgiiu60g
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arrays/_numeric.py.bak
 
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"""Run-time calculation of offset into Python Numeric (old) structures
 
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Numeric Python, by fortuitous chance, puts the one thing
 
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we need precisely as the first value in the structure beyond the
 
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PyObject * header, so that it's exactly that many bytes from the
 
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pointer value for the object...
 
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"""
 
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import ctypes
 
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def dataPointerFunction( ):
 
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    """Calculate the data-pointer offset in the Numeric object header"""
 
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    offset = object.__basicsize__
 
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    from_address = ctypes.c_void_p.from_address
 
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    def dataPointer( data):
 
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        """Return pointer-to-data + offset"""
 
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        return from_address( id( data ) + offset ).value
 
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    return dataPointer
 
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dataPointer = dataPointerFunction()
 
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if __name__ == "__main__":
 
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    import Numeric 
 
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    test = Numeric.arange( 0,200, 1,'i' )
 
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    aType = ctypes.c_int * 200
 
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    test2 = aType.from_address( dataPointer( test ) )
 
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    assert test == test2, (test,test2)
 
 
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