mimetypes.py 文件源码

def read_windows_registry(self, strict=True):
        """
        Load the MIME types database from Windows registry.

        If strict is true, information will be added to
        list of standard types, else to the list of non-standard
        types.
        """

        # Windows only
        if not _winreg:
            return

        def enum_types(mimedb):
            i = 0
            while True:
                try:
                    yield _winreg.EnumKey(mimedb, i)
                except EnvironmentError:
                    break
                i += 1

        default_encoding = sys.getdefaultencoding()
        with _winreg.OpenKey(_winreg.HKEY_CLASSES_ROOT, '') as hkcr:
            for subkeyname in enum_types(hkcr):
                try:
                    with _winreg.OpenKey(hkcr, subkeyname) as subkey:
                        # Only check file extensions
                        if not subkeyname.startswith("."):
                            continue
                        # raises EnvironmentError if no 'Content Type' value
                        mimetype, datatype = _winreg.QueryValueEx(
                            subkey, 'Content Type')
                        if datatype != _winreg.REG_SZ:
                            continue
                        try:
                            mimetype = mimetype.encode(default_encoding)
                        except UnicodeEncodeError:
                            continue
                        self.add_type(mimetype, subkeyname, strict)
                except EnvironmentError:
                    continue