Python ctypes and mutable strings calling Fortran DLL: Access Violation Error -


i trying call subroutine in fortran dll requires 3 mutable strings passed it. subroutine of form:

subroutine getinfo(string_1, string_2, string_3, index) char *60 string_1, string_2 char *30 string_3  string_1 = "string 1 return value" string_2 = "string 2 return value" string_3 = "string 3 return value"  end subroutine

im calling function in python follows:

dll = ctypes.windll.loadlibrary('library.dll') funcprot = getattr(dll, 'getinfo') funcprot.argtypes = [ctypes.c_char_p, ctypes.c_long, ctypes.c_char_p, ctypes.c_long,       ctypes.c_char_p, ctypes.c_long, ctypes.c_long]  string_1 = ctypes.create_string_buffer(60) string_2 = ctypes.create_string_buffer(60) string_3 = ctypes.create_string_buffer(30)  funcprot(string_1, 60, string_2, 60, string_3, 30, 701)

i following error.

windowserror: exception: access violation reading 0x000002bd

i tried suggestions post, didn't help.

what doing wrong? thank help.


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