Question

I’m trying to map a struct definition using ctypes:

struct attrl {                struct attrl *next;                char         *name;                char         *resource;                char         *value;            }; 

I’m unsure what to do with the ‘next’ field of the struct in the ctypes mapping. A definition like:

class attrl(Structure):     _fields_ = [         ('next', attrl),         ('name', c_char_p),          ('resource', c_char_p),          ('value', c_char_p)     ] 

results in:

NameError: name 'attrl' is not defined 

Answer 1

You need the equivalent of a forward declaration, as described here.