On 2022-09-15, Eryk Sun <eryk...@gmail.com> wrote: > On 9/15/22, Grant Edwards <grant.b.edwa...@gmail.com> wrote: >> >> Can that be done using ctypes? >> >> For example, I open a library that contains functon foo() where foo() >> calls external function bar() which is not contained in the library. >> Then, I provide a Python bar() function that gets called by foo() when >> foo() is called? > > That's straight forward if the library allows the application to pass > a function pointer to bar().
That's typically not the case. Does the pointer have to be passed? Or can it be "poked" into a global variable? If so, I guess it would be fairly trivial to write a dummy version of bar() in C that calls a function via a global pointer that could be set via ctypes? > ctypes function prototypes are defined by ctypes.CFUNCTYPE(restype, > *argtypes, use_errno=False, use_last_error=False) for the cdecl > calling convention, or similarly by ctypes.WINFUNCTYPE() to use the > Windows stdcall calling convention. A prototype can be instantiated > as a function pointer that calls a Python function, e.g. c_bar = > prototype(bar). -- https://mail.python.org/mailman/listinfo/python-list
