ctype C with Python

c と python とのインタラクションをしてみる。
あまりに汚さ過ぎるけど、とりあえず動作概要は把握できたかな。

[test.py]
  1 #!/usr/bin/env python
  2 # -*- coding: utf-8 -*-
  3 #
  4 
  5 import ctypes
  6 
  7 lpcell = ctypes.POINTER("cell")
  8 class cell(ctypes.Structure):
  9     _fields_ = [("name", ctypes.c_char_p),
 10                 ("next", lpcell)]
 11 ctypes.SetPointerType(lpcell, cell)
 12 
 13 def main():
 14     lib = ctypes.CDLL('./libsample.dylib')
 15     mfunc = lib.set_cell_name
 16     c1 = cell()
 17     mfunc(ctypes.pointer(c1))
 18     print c1.name
 19     
 20 #-------------------------------------------------
 21 if __name__ == "__main__":
 22     main()

[sample.c]
  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4 
  5 static int cnt = 0;
  6 const char buf[256] = "test.name";
  7 
  8 struct cell {
  9         char *name;
 10         struct cell *next;
 11 };
 12 
 13 struct cell *
 14 set_cell_name (struct cell *c)
 15 {
 16         c->name = malloc(strlen(buf)+2);
 17         if (NULL == c->name)
 18                 return c;
 19         memset(c->name, 0, strlen(buf)+2);
 20         snprintf(c->name, strlen(buf)+1, "%s%d", buf, cnt++);
 21         return c;
 22 }