text: ######################################################################
  #  This file should be kept compatible with Python 2.3, see PEP 291. #
  ######################################################################
  import sys, os
  
  # find_library(name) returns the pathname of a library, or None.
  if os.name == "nt":
      def find_library(name):
          # See MSDN for the REAL search order.
          for directory in os.environ['PATH'].split(os.pathsep):
              fname = os.path.join(directory, name)
              if os.path.exists(fname):
                  return fname
              if fname.lower().endswith(".dll"):
                  continue
              fname = fname + ".dll"
              if os.path.exists(fname):
                  return fname
          return None
  
  if os.name == "ce":
      # search path according to MSDN:
      # - absolute path specified by filename
      # - The .exe launch directory
      # - the Windows directory
      # - ROM dll files (where are they?)
      # - OEM specified search path: HKLM\Loader\SystemPath
      def find_library(name):
          return name
  
  if os.name == "posix" and sys.platform == "darwin":
      from ctypes.macholib.dyld import dyld_find as _dyld_find
      def find_library(name):
          possible = ['lib%s.dylib' % name,
                      '%s.dylib' % name,
                      '%s.framework/%s' % (name, name)]
          for name in possible:
              try:
                  return _dyld_find(name)
              except ValueError:
                  continue
          return None
  
  elif os.name == "posix":
      # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
      import re, tempfile, errno
  
      def _findLib_gcc(name):
          expr = '[^\(\)\s]*lib%s\.[^\(\)\s]*' % name
          fdout, ccout = tempfile.mkstemp()
          os.close(fdout)
          cmd = 'if type gcc &>/dev/null; then CC=gcc; else CC=cc; fi;' \
                '$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
          try:
              fdout, outfile =  tempfile.mkstemp()
              os.close(fdout)
              fd = os.popen(cmd)
              trace = fd.read()
              err = fd.close()
          finally:
              try:
                  os.unlink(outfile)
              except OSError, e:
                  if e.errno != errno.ENOENT:
                      raise
              try:
                  os.unlink(ccout)
              except OSError, e:
                  if e.errno != errno.ENOENT:
                      raise
          res = re.search(expr, trace)
          if not res:
              return None
          return res.group(0)
  
      def _findLib_ld(name):
          expr = '/[^\(\)\s]*lib%s\.[^\(\)\s]*' % name
          res = re.search(expr, os.popen('/sbin/ldconfig -p 2>/dev/null').read())
          if not res:
              # Hm, this works only for libs needed by the python executable.
              cmd = 'ldd %s 2>/dev/null' % sys.executable
              res = re.search(expr, os.popen(cmd).read())
              if not res:
                  return None
          return res.group(0)
  
      def _get_soname(f):
          cmd = "objdump -p -j .dynamic 2>/dev/null " + f
          res = re.search(r'\sSONAME\s+([^\s]+)', os.popen(cmd).read())
          if not res:
              return None
          return res.group(1)
  
      def find_library(name):
          lib = _findLib_ld(name) or _findLib_gcc(name)
          if not lib:
              return None
          return _get_soname(lib)
  
  ################################################################
  # test code
  
  def test():
      from ctypes import cdll
      if os.name == "nt":
          print cdll.msvcrt
          print cdll.load("msvcrt")
          print find_library("msvcrt")
  
      if os.name == "posix":
          # find and load_version
          print find_library("m")
          print find_library("c")
          print find_library("bz2")
  
          # getattr
  ##        print cdll.m
  ##        print cdll.bz2
  
          # load
          if sys.platform == "darwin":
              print cdll.LoadLibrary("libm.dylib")
              print cdll.LoadLibrary("libcrypto.dylib")
              print cdll.LoadLibrary("libSystem.dylib")
              print cdll.LoadLibrary("System.framework/System")
          else:
              print cdll.LoadLibrary("libm.so")
              print cdll.LoadLibrary("libcrypt.so")
              print find_library("crypt")
  
  if __name__ == "__main__":
      test()
  