dll.py 文件源码

def __init__(self, libinfo, libnames, path=None):
        self._dll = None
        foundlibs = _findlib(libnames, path)
        dllmsg = "PYSDL2_DLL_PATH: %s" % (os.getenv("PYSDL2_DLL_PATH") or "unset")
        if len(foundlibs) == 0:
            raise RuntimeError("could not find any library for %s (%s)" %
                               (libinfo, dllmsg))
        for libfile in foundlibs:
            try:
                self._dll = CDLL(libfile)
                self._libfile = libfile
                break
            except Exception as exc:
                # Could not load the DLL, move to the next, but inform the user
                # about something weird going on - this may become noisy, but
                # is better than confusing the users with the RuntimeError below
                warnings.warn(repr(exc), DLLWarning)
        if self._dll is None:
            raise RuntimeError("found %s, but it's not usable for the library %s" %
                               (foundlibs, libinfo))
        if path is not None and sys.platform in ("win32",) and \
            path in self._libfile:
            os.environ["PATH"] = "%s;%s" % (path, os.environ["PATH"])