Hi, Jim, You only gave us half of the source. Which way do you pass the memory address to the native DLL?
One difference is, for example, that .NET relocates objects sometimes, so they need to be pinned. Best regards Markus Schaber -- ___________________________ We software Automation. 3S-Smart Software Solutions GmbH Markus Schaber | Developer Memminger Str. 151 | 87439 Kempten | Germany | Tel. +49-831-54031-0 | Fax +49-831-54031-50 Email: m.scha...@3s-software.com<mailto:m.scha...@3s-software.com> | Web: http://www.3s-software.com <http://www.3s-software.com/> CoDeSys internet forum: http://forum.3s-software.com<http://forum-en.3s-software.com/> Download CoDeSys sample projects: http://www.3s-software.com/index.shtml?sample_projects Managing Directors: Dipl.Inf. Dieter Hess, Dipl.Inf. Manfred Werner | Trade register: Kempten HRB 6186 | Tax ID No.: DE 167014915 Von: ironpython-users-bounces+m.schaber=3s-software....@python.org [mailto:ironpython-users-bounces+m.schaber=3s-software....@python.org] Im Auftrag von Jim Pattee Gesendet: Montag, 23. Januar 2012 00:50 An: ironpython-users@python.org Betreff: [Ironpython-users] Memory Allocation in Iron Python I am trying to allocate memory in Iron Python to receive text from a DLL. The allocated memory address is passed to the DLL and the text is copied by the DLL into the memory area. The following code, which works in CPython, is used: allocated = [] def MemoryAllocation(size): arr_type = c_char * size # create a c_char array arr_obj = arr_type() # create an array object allocated.append(arr_obj) # so the object will not be destroyed if len(allocated) > 1: # free memory for the previous object del allocated[0] return addressof(arr_obj) # return a pointer When this is used for Iron Python it results in: “Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.” The error results when the memory is copied into Python by the DLL. There are no errors displayed when executing the above code. Why can it not write to the memory? What is the difference in Iron Python and CPython?
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