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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"undefined symbol: iptc_init (libiptc compatibilitly)","articleBody":"If libip4tc doesn't exist but libiptc does the module failes to load with the following error:\n\n```\nTraceback (most recent call last):                                                                                                                                                                                                          \n  File \"comment.py\", line 3, in \u003cmodule\u003e                                                                                                                                                                                                    \n    import iptc                                                                                                                                                                                                                             \n  File \"/usr/lib/pymodules/python2.6/iptc/__init__.py\", line 110, in \u003cmodule\u003e                                                                                                                                                               \n    class iptc(object):                                                                                                                                                                                                                     \n  File \"/usr/lib/pymodules/python2.6/iptc/__init__.py\", line 112, in iptc                                                                                                                                                                   \n    iptc_init = _libiptc.iptc_init                                                                                                                                                                                                          \n  File \"/usr/lib/python2.6/ctypes/__init__.py\", line 366, in __getattr__                                                                                                                                                                    \n    func = self.__getitem__(name)                                                                                                                                                                                                           \n  File \"/usr/lib/python2.6/ctypes/__init__.py\", line 371, in __getitem__                                                                                                                                                                    \n    func = self._FuncPtr((name_or_ordinal, self))                                                                                                                                                                                           \nAttributeError: python: undefined symbol: iptc_init\n```\n\nSeems like ctypes.CDLL() doesn't throw an exception in case the lib couldn't be loaded.\n\nFollwoing change should fix the problem:\n\n```\ndiff --git a/iptc/__init__.py b/iptc/__init__.py\nindex 400111c..3d25f29 100644\n--- a/iptc/__init__.py\n+++ b/iptc/__init__.py\n@@ -102,10 +102,15 @@ class ipt_entry_match(xt_entry_match):\n\n ipt_align = xt_align\n\n-try:\n-    _libiptc = ct.CDLL(ctypes.util.find_library(\"ip4tc\"), use_errno = True)\n-except:\n-    _libiptc = ct.CDLL(ctypes.util.find_library(\"iptc\"), use_errno = True)\n+_libiptc_file = ctypes.util.find_library(\"ip4tc\")\n+\n+if not _libiptc_file:\n+    _libiptc_file = ctypes.util.find_library(\"iptc\")\n+\n+if not _libiptc_file:\n+    raise IPTCError(\"error: libiptc/libip4tc not found\")\n+\n+_libiptc = ct.CDLL(_libiptc_file, use_errno = True)\n\n class iptc(object):\n     \"\"\"This class contains all libiptc API calls.\"\"\"\n```\n","author":{"url":"https://github.com/freddy36","@type":"Person","name":"freddy36"},"datePublished":"2012-05-07T10:18:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/5/python-iptables/issues/5"}