dbus.lowlevel module — dbus-python 1.4.0 documentation

# dbus.lowlevel module

Low-level interface to D-Bus.

class dbus.lowlevel.ErrorMessage(reply_to: Message, error_name: str, error_message: str or None)

  Bases: `Message`

  An error message.

  append(*args, **kwargs)

    Set the message’s arguments from the positional parameter, according to the signature given by the `signature` keyword parameter.

    The following type conversions are supported:

    D-Bus (in signature) | Python
    --- | ---
    boolean (b) | any object (via bool())
    byte (y) | string of length 1 any integer
    any integer type | any integer
    double (d) | any float
    object path | anything with a __dbus_object_path__ attribute
    string, signature, object path | str (must be UTF-8) or unicode
    dict (a{…}) | any mapping
    array (a…) | any iterable over appropriate objects
    struct ((…)) | any iterable over appropriate objects
    variant | any object above (guess type as below)

    Here ‘any integer’ means anything on which int() or long() (as appropriate) will work, except for basestring subclasses. ‘Any float’ means anything on which float() will work, except for basestring subclasses.

    If there is no signature, guess from the arguments using the static method Message.guess_signature.

  copy() -> Message (or subclass)

    Deep-copy the message, resetting the serial number to zero.

  get_allow_interactive_authorization(bool) → None

    Get allow interactive authorization flag.

  get_args_list(**kwargs) → list

    Return the message’s arguments. Keyword arguments control the translation of D-Bus types to Python:

    Keywords:
      byte_arraysbool

        If true, convert arrays of byte (signature ‘ay’) into dbus.ByteArray, a str subclass. In practice, this is usually what you want, but it’s off by default for consistency.

        If false (default), convert them into a dbus.Array of Bytes.

    Most of the type mappings should be fairly obvious:

    D-Bus | Python
    --- | ---
    byte (y) | dbus.Byte (int subclass)
    bool (b) | dbus.Boolean (int subclass)
    Signature (g) | dbus.Signature (str subclass)
    intNN, uintNN | dbus.IntNN, dbus.UIntNN (int or long subclasses)
    double (d) | dbus.Double
    string (s) | dbus.String (unicode subclass) (or dbus.UTF8String, bytes subclass, if utf8_strings set)
    Object path (o) | dbus.ObjectPath (str subclass)
    dict (a{…}) | dbus.Dictionary
    array (a…) | dbus.Array (list subclass) containing appropriate types
    byte array (ay) | dbus.ByteArray (str subclass) if byte_arrays set; or list of Byte
    struct ((…)) | dbus.Struct (tuple subclass) of appropriate types
    variant (v) | contained type, but with variant_level > 0

  get_auto_start() → bool

    Return true if this message will cause an owner for the destination name to be auto-started.

  get_destination() → str or None

    Return the message’s destination bus name, or None if none.

  get_error_name() → str or None
  get_interface() → str or None
  get_member() → str or None
  get_no_reply() → bool

    Return true if this message need not be replied to.

  get_path() → ObjectPath or None

    Return the message’s destination object path (if it’s a method call) or source object path (if it’s a method reply or a signal) or None (if it has no path).

  get_path_decomposed() → list of str, or None

    Return a list of path components (e.g. /foo/bar -> [‘foo’,’bar’], / -> []) or None if the message has no associated path.

  get_reply_serial() → long

    Returns the serial that the message is a reply to or 0 if none.

  get_sender() → str or None

    Return the message’s sender unique name, or None if none.

  get_serial() → long

    Returns the serial of a message or 0 if none has been specified.

    The message’s serial number is provided by the application sending the message and is used to identify replies to this message. All messages received on a connection will have a serial, but messages you haven’t sent yet may return 0.

  get_signature() → Signature or None
  get_type() → int

    Returns the type of the message.

  static guess_signature(*args) → Signature [static method]

    Guess a D-Bus signature which should be used to encode the given Python objects.

    The signature is constructed as follows:

    Python | D-Bus
    --- | ---
    D-Bus type, variant_level > 0 | variant (v)
    D-Bus type, variant_level == 0 | the corresponding type
    anything with a __dbus_object_path__ attribute | object path
    bool | boolean (y)
    any other int subclass | int32 (i)
    any other long subclass | int64 (x)
    any other float subclass | double (d)
    any other str subclass | string (s)
    any other unicode subclass | string (s)
    any other tuple subclass | struct ((…))
    any other list subclass | array (a…), guess contents’ type according to type of first item
    any other dict subclass | dict (a{…}), guess key, value type according to types for an arbitrary item
    anything else | raise TypeError

  has_destination(bus_name: str) → bool
  has_interface(interface: str or None) → bool
  has_member(name: str or None) → bool
  has_path(name: str or None) → bool
  has_sender(unique_name: str) → bool
  has_signature(signature: str) → bool
  is_error(error: str) → bool
  is_method_call(interface: str, member: str) → bool
  is_signal(interface: str, member: str) → bool
  set_allow_interactive_authorization(bool) → None

    Set allow interactive authorization flag to this message.

  set_auto_start(bool) → None

    Set whether this message will cause an owner for the destination name to be auto-started.

  set_destination(bus_name: str or None)
  set_error_name(name: str or None)
  set_interface(name: str or None)
  set_member(unique_name: str or None)
  set_no_reply(bool) → None

    Set whether no reply to this message is required.

  set_path(name: str or None)
  set_reply_serial(bool) → None

    Set the serial that this message is a reply to.

  set_sender(unique_name: str or None)

class dbus.lowlevel.Message

  Bases: `object`

  A message to be sent or received over a D-Bus Connection.

  append(*args, **kwargs)

    Set the message’s arguments from the positional parameter, according to the signature given by the `signature` keyword parameter.

    The following type conversions are supported:

    D-Bus (in signature) | Python
    --- | ---
    boolean (b) | any object (via bool())
    byte (y) | string of length 1 any integer
    any integer type | any integer
    double (d) | any float
    object path | anything with a __dbus_object_path__ attribute
    string, signature, object path | str (must be UTF-8) or unicode
    dict (a{…}) | any mapping
    array (a…) | any iterable over appropriate objects
    struct ((…)) | any iterable over appropriate objects
    variant | any object above (guess type as below)

    Here ‘any integer’ means anything on which int() or long() (as appropriate) will work, except for basestring subclasses. ‘Any float’ means anything on which float() will work, except for basestring subclasses.

    If there is no signature, guess from the arguments using the static method Message.guess_signature.

  copy() -> Message (or subclass)

    Deep-copy the message, resetting the serial number to zero.

  get_allow_interactive_authorization(bool) → None

    Get allow interactive authorization flag.

  get_args_list(**kwargs) → list

    Return the message’s arguments. Keyword arguments control the translation of D-Bus types to Python:

    Keywords:
      byte_arraysbool

        If true, convert arrays of byte (signature ‘ay’) into dbus.ByteArray, a str subclass. In practice, this is usually what you want, but it’s off by default for consistency.

        If false (default), convert them into a dbus.Array of Bytes.

    Most of the type mappings should be fairly obvious:

    D-Bus | Python
    --- | ---
    byte (y) | dbus.Byte (int subclass)
    bool (b) | dbus.Boolean (int subclass)
    Signature (g) | dbus.Signature (str subclass)
    intNN, uintNN | dbus.IntNN, dbus.UIntNN (int or long subclasses)
    double (d) | dbus.Double
    string (s) | dbus.String (unicode subclass) (or dbus.UTF8String, bytes subclass, if utf8_strings set)
    Object path (o) | dbus.ObjectPath (str subclass)
    dict (a{…}) | dbus.Dictionary
    array (a…) | dbus.Array (list subclass) containing appropriate types
    byte array (ay) | dbus.ByteArray (str subclass) if byte_arrays set; or list of Byte
    struct ((…)) | dbus.Struct (tuple subclass) of appropriate types
    variant (v) | contained type, but with variant_level > 0

  get_auto_start() → bool

    Return true if this message will cause an owner for the destination name to be auto-started.

  get_destination() → str or None

    Return the message’s destination bus name, or None if none.

  get_error_name() → str or None
  get_interface() → str or None
  get_member() → str or None
  get_no_reply() → bool

    Return true if this message need not be replied to.

  get_path() → ObjectPath or None

    Return the message’s destination object path (if it’s a method call) or source object path (if it’s a method reply or a signal) or None (if it has no path).

  get_path_decomposed() → list of str, or None

    Return a list of path components (e.g. /foo/bar -> [‘foo’,’bar’], / -> []) or None if the message has no associated path.

  get_reply_serial() → long

    Returns the serial that the message is a reply to or 0 if none.

  get_sender() → str or None

    Return the message’s sender unique name, or None if none.

  get_serial() → long

    Returns the serial of a message or 0 if none has been specified.

    The message’s serial number is provided by the application sending the message and is used to identify replies to this message. All messages received on a connection will have a serial, but messages you haven’t sent yet may return 0.

  get_signature() → Signature or None
  get_type() → int

    Returns the type of the message.

  static guess_signature(*args) → Signature [static method]

    Guess a D-Bus signature which should be used to encode the given Python objects.

    The signature is constructed as follows:

    Python | D-Bus
    --- | ---
    D-Bus type, variant_level > 0 | variant (v)
    D-Bus type, variant_level == 0 | the corresponding type
    anything with a __dbus_object_path__ attribute | object path
    bool | boolean (y)
    any other int subclass | int32 (i)
    any other long subclass | int64 (x)
    any other float subclass | double (d)
    any other str subclass | string (s)
    any other unicode subclass | string (s)
    any other tuple subclass | struct ((…))
    any other list subclass | array (a…), guess contents’ type according to type of first item
    any other dict subclass | dict (a{…}), guess key, value type according to types for an arbitrary item
    anything else | raise TypeError

  has_destination(bus_name: str) → bool
  has_interface(interface: str or None) → bool
  has_member(name: str or None) → bool
  has_path(name: str or None) → bool
  has_sender(unique_name: str) → bool
  has_signature(signature: str) → bool
  is_error(error: str) → bool
  is_method_call(interface: str, member: str) → bool
  is_signal(interface: str, member: str) → bool
  set_allow_interactive_authorization(bool) → None

    Set allow interactive authorization flag to this message.

  set_auto_start(bool) → None

    Set whether this message will cause an owner for the destination name to be auto-started.

  set_destination(bus_name: str or None)
  set_error_name(name: str or None)
  set_interface(name: str or None)
  set_member(unique_name: str or None)
  set_no_reply(bool) → None

    Set whether no reply to this message is required.

  set_path(name: str or None)
  set_reply_serial(bool) → None

    Set the serial that this message is a reply to.

  set_sender(unique_name: str or None)

class dbus.lowlevel.MethodCallMessage(destination: str or None, path: str, interface: str or None, method: str)

  Bases: `Message`

  A method-call message.

  `destination` is the destination bus name, or None to send the message directly to the peer (usually the bus daemon).

  `path` is the object-path of the object whose method is to be called.

  `interface` is the interface qualifying the method name, or None to omit the interface from the message header.

  `method` is the method name (member name).

  append(*args, **kwargs)

    Set the message’s arguments from the positional parameter, according to the signature given by the `signature` keyword parameter.

    The following type conversions are supported:

    D-Bus (in signature) | Python
    --- | ---
    boolean (b) | any object (via bool())
    byte (y) | string of length 1 any integer
    any integer type | any integer
    double (d) | any float
    object path | anything with a __dbus_object_path__ attribute
    string, signature, object path | str (must be UTF-8) or unicode
    dict (a{…}) | any mapping
    array (a…) | any iterable over appropriate objects
    struct ((…)) | any iterable over appropriate objects
    variant | any object above (guess type as below)

    Here ‘any integer’ means anything on which int() or long() (as appropriate) will work, except for basestring subclasses. ‘Any float’ means anything on which float() will work, except for basestring subclasses.

    If there is no signature, guess from the arguments using the static method Message.guess_signature.

  copy() -> Message (or subclass)

    Deep-copy the message, resetting the serial number to zero.

  get_allow_interactive_authorization(bool) → None

    Get allow interactive authorization flag.

  get_args_list(**kwargs) → list

    Return the message’s arguments. Keyword arguments control the translation of D-Bus types to Python:

    Keywords:
      byte_arraysbool

        If true, convert arrays of byte (signature ‘ay’) into dbus.ByteArray, a str subclass. In practice, this is usually what you want, but it’s off by default for consistency.

        If false (default), convert them into a dbus.Array of Bytes.

    Most of the type mappings should be fairly obvious:

    D-Bus | Python
    --- | ---
    byte (y) | dbus.Byte (int subclass)
    bool (b) | dbus.Boolean (int subclass)
    Signature (g) | dbus.Signature (str subclass)
    intNN, uintNN | dbus.IntNN, dbus.UIntNN (int or long subclasses)
    double (d) | dbus.Double
    string (s) | dbus.String (unicode subclass) (or dbus.UTF8String, bytes subclass, if utf8_strings set)
    Object path (o) | dbus.ObjectPath (str subclass)
    dict (a{…}) | dbus.Dictionary
    array (a…) | dbus.Array (list subclass) containing appropriate types
    byte array (ay) | dbus.ByteArray (str subclass) if byte_arrays set; or list of Byte
    struct ((…)) | dbus.Struct (tuple subclass) of appropriate types
    variant (v) | contained type, but with variant_level > 0

  get_auto_start() → bool

    Return true if this message will cause an owner for the destination name to be auto-started.

  get_destination() → str or None

    Return the message’s destination bus name, or None if none.

  get_error_name() → str or None
  get_interface() → str or None
  get_member() → str or None
  get_no_reply() → bool

    Return true if this message need not be replied to.

  get_path() → ObjectPath or None

    Return the message’s destination object path (if it’s a method call) or source object path (if it’s a method reply or a signal) or None (if it has no path).

  get_path_decomposed() → list of str, or None

    Return a list of path components (e.g. /foo/bar -> [‘foo’,’bar’], / -> []) or None if the message has no associated path.

  get_reply_serial() → long

    Returns the serial that the message is a reply to or 0 if none.

  get_sender() → str or None

    Return the message’s sender unique name, or None if none.

  get_serial() → long

    Returns the serial of a message or 0 if none has been specified.

    The message’s serial number is provided by the application sending the message and is used to identify replies to this message. All messages received on a connection will have a serial, but messages you haven’t sent yet may return 0.

  get_signature() → Signature or None
  get_type() → int

    Returns the type of the message.

  static guess_signature(*args) → Signature [static method]

    Guess a D-Bus signature which should be used to encode the given Python objects.

    The signature is constructed as follows:

    Python | D-Bus
    --- | ---
    D-Bus type, variant_level > 0 | variant (v)
    D-Bus type, variant_level == 0 | the corresponding type
    anything with a __dbus_object_path__ attribute | object path
    bool | boolean (y)
    any other int subclass | int32 (i)
    any other long subclass | int64 (x)
    any other float subclass | double (d)
    any other str subclass | string (s)
    any other unicode subclass | string (s)
    any other tuple subclass | struct ((…))
    any other list subclass | array (a…), guess contents’ type according to type of first item
    any other dict subclass | dict (a{…}), guess key, value type according to types for an arbitrary item
    anything else | raise TypeError

  has_destination(bus_name: str) → bool
  has_interface(interface: str or None) → bool
  has_member(name: str or None) → bool
  has_path(name: str or None) → bool
  has_sender(unique_name: str) → bool
  has_signature(signature: str) → bool
  is_error(error: str) → bool
  is_method_call(interface: str, member: str) → bool
  is_signal(interface: str, member: str) → bool
  set_allow_interactive_authorization(bool) → None

    Set allow interactive authorization flag to this message.

  set_auto_start(bool) → None

    Set whether this message will cause an owner for the destination name to be auto-started.

  set_destination(bus_name: str or None)
  set_error_name(name: str or None)
  set_interface(name: str or None)
  set_member(unique_name: str or None)
  set_no_reply(bool) → None

    Set whether no reply to this message is required.

  set_path(name: str or None)
  set_reply_serial(bool) → None

    Set the serial that this message is a reply to.

  set_sender(unique_name: str or None)

class dbus.lowlevel.MethodReturnMessage(method_call: MethodCallMessage)

  Bases: `Message`

  A method-return message.

  append(*args, **kwargs)

    Set the message’s arguments from the positional parameter, according to the signature given by the `signature` keyword parameter.

    The following type conversions are supported:

    D-Bus (in signature) | Python
    --- | ---
    boolean (b) | any object (via bool())
    byte (y) | string of length 1 any integer
    any integer type | any integer
    double (d) | any float
    object path | anything with a __dbus_object_path__ attribute
    string, signature, object path | str (must be UTF-8) or unicode
    dict (a{…}) | any mapping
    array (a…) | any iterable over appropriate objects
    struct ((…)) | any iterable over appropriate objects
    variant | any object above (guess type as below)

    Here ‘any integer’ means anything on which int() or long() (as appropriate) will work, except for basestring subclasses. ‘Any float’ means anything on which float() will work, except for basestring subclasses.

    If there is no signature, guess from the arguments using the static method Message.guess_signature.

  copy() -> Message (or subclass)

    Deep-copy the message, resetting the serial number to zero.

  get_allow_interactive_authorization(bool) → None

    Get allow interactive authorization flag.

  get_args_list(**kwargs) → list

    Return the message’s arguments. Keyword arguments control the translation of D-Bus types to Python:

    Keywords:
      byte_arraysbool

        If true, convert arrays of byte (signature ‘ay’) into dbus.ByteArray, a str subclass. In practice, this is usually what you want, but it’s off by default for consistency.

        If false (default), convert them into a dbus.Array of Bytes.

    Most of the type mappings should be fairly obvious:

    D-Bus | Python
    --- | ---
    byte (y) | dbus.Byte (int subclass)
    bool (b) | dbus.Boolean (int subclass)
    Signature (g) | dbus.Signature (str subclass)
    intNN, uintNN | dbus.IntNN, dbus.UIntNN (int or long subclasses)
    double (d) | dbus.Double
    string (s) | dbus.String (unicode subclass) (or dbus.UTF8String, bytes subclass, if utf8_strings set)
    Object path (o) | dbus.ObjectPath (str subclass)
    dict (a{…}) | dbus.Dictionary
    array (a…) | dbus.Array (list subclass) containing appropriate types
    byte array (ay) | dbus.ByteArray (str subclass) if byte_arrays set; or list of Byte
    struct ((…)) | dbus.Struct (tuple subclass) of appropriate types
    variant (v) | contained type, but with variant_level > 0

  get_auto_start() → bool

    Return true if this message will cause an owner for the destination name to be auto-started.

  get_destination() → str or None

    Return the message’s destination bus name, or None if none.

  get_error_name() → str or None
  get_interface() → str or None
  get_member() → str or None
  get_no_reply() → bool

    Return true if this message need not be replied to.

  get_path() → ObjectPath or None

    Return the message’s destination object path (if it’s a method call) or source object path (if it’s a method reply or a signal) or None (if it has no path).

  get_path_decomposed() → list of str, or None

    Return a list of path components (e.g. /foo/bar -> [‘foo’,’bar’], / -> []) or None if the message has no associated path.

  get_reply_serial() → long

    Returns the serial that the message is a reply to or 0 if none.

  get_sender() → str or None

    Return the message’s sender unique name, or None if none.

  get_serial() → long

    Returns the serial of a message or 0 if none has been specified.

    The message’s serial number is provided by the application sending the message and is used to identify replies to this message. All messages received on a connection will have a serial, but messages you haven’t sent yet may return 0.

  get_signature() → Signature or None
  get_type() → int

    Returns the type of the message.

  static guess_signature(*args) → Signature [static method]

    Guess a D-Bus signature which should be used to encode the given Python objects.

    The signature is constructed as follows:

    Python | D-Bus
    --- | ---
    D-Bus type, variant_level > 0 | variant (v)
    D-Bus type, variant_level == 0 | the corresponding type
    anything with a __dbus_object_path__ attribute | object path
    bool | boolean (y)
    any other int subclass | int32 (i)
    any other long subclass | int64 (x)
    any other float subclass | double (d)
    any other str subclass | string (s)
    any other unicode subclass | string (s)
    any other tuple subclass | struct ((…))
    any other list subclass | array (a…), guess contents’ type according to type of first item
    any other dict subclass | dict (a{…}), guess key, value type according to types for an arbitrary item
    anything else | raise TypeError

  has_destination(bus_name: str) → bool
  has_interface(interface: str or None) → bool
  has_member(name: str or None) → bool
  has_path(name: str or None) → bool
  has_sender(unique_name: str) → bool
  has_signature(signature: str) → bool
  is_error(error: str) → bool
  is_method_call(interface: str, member: str) → bool
  is_signal(interface: str, member: str) → bool
  set_allow_interactive_authorization(bool) → None

    Set allow interactive authorization flag to this message.

  set_auto_start(bool) → None

    Set whether this message will cause an owner for the destination name to be auto-started.

  set_destination(bus_name: str or None)
  set_error_name(name: str or None)
  set_interface(name: str or None)
  set_member(unique_name: str or None)
  set_no_reply(bool) → None

    Set whether no reply to this message is required.

  set_path(name: str or None)
  set_reply_serial(bool) → None

    Set the serial that this message is a reply to.

  set_sender(unique_name: str or None)

class dbus.lowlevel.PendingCall

  Bases: `object`

  Object representing a pending D-Bus call, returned by Connection.send_message_with_reply(). Cannot be instantiated directly.

  block()

    Block until this pending call has completed and the associated reply handler has been called.

    This can lead to a deadlock, if the called method tries to make a synchronous call to a method in this application.

  cancel()

    Cancel this pending call. Its reply will be ignored and the associated reply handler will never be called.

  get_completed() → bool

    Return true if this pending call has completed.

    If so, its associated reply handler has been called and it is no longer meaningful to cancel it.

class dbus.lowlevel.SignalMessage(path: str, interface: str, method: str)

  Bases: `Message`

  A signal message.

  append(*args, **kwargs)

    Set the message’s arguments from the positional parameter, according to the signature given by the `signature` keyword parameter.

    The following type conversions are supported:

    D-Bus (in signature) | Python
    --- | ---
    boolean (b) | any object (via bool())
    byte (y) | string of length 1 any integer
    any integer type | any integer
    double (d) | any float
    object path | anything with a __dbus_object_path__ attribute
    string, signature, object path | str (must be UTF-8) or unicode
    dict (a{…}) | any mapping
    array (a…) | any iterable over appropriate objects
    struct ((…)) | any iterable over appropriate objects
    variant | any object above (guess type as below)

    Here ‘any integer’ means anything on which int() or long() (as appropriate) will work, except for basestring subclasses. ‘Any float’ means anything on which float() will work, except for basestring subclasses.

    If there is no signature, guess from the arguments using the static method Message.guess_signature.

  copy() -> Message (or subclass)

    Deep-copy the message, resetting the serial number to zero.

  get_allow_interactive_authorization(bool) → None

    Get allow interactive authorization flag.

  get_args_list(**kwargs) → list

    Return the message’s arguments. Keyword arguments control the translation of D-Bus types to Python:

    Keywords:
      byte_arraysbool

        If true, convert arrays of byte (signature ‘ay’) into dbus.ByteArray, a str subclass. In practice, this is usually what you want, but it’s off by default for consistency.

        If false (default), convert them into a dbus.Array of Bytes.

    Most of the type mappings should be fairly obvious:

    D-Bus | Python
    --- | ---
    byte (y) | dbus.Byte (int subclass)
    bool (b) | dbus.Boolean (int subclass)
    Signature (g) | dbus.Signature (str subclass)
    intNN, uintNN | dbus.IntNN, dbus.UIntNN (int or long subclasses)
    double (d) | dbus.Double
    string (s) | dbus.String (unicode subclass) (or dbus.UTF8String, bytes subclass, if utf8_strings set)
    Object path (o) | dbus.ObjectPath (str subclass)
    dict (a{…}) | dbus.Dictionary
    array (a…) | dbus.Array (list subclass) containing appropriate types
    byte array (ay) | dbus.ByteArray (str subclass) if byte_arrays set; or list of Byte
    struct ((…)) | dbus.Struct (tuple subclass) of appropriate types
    variant (v) | contained type, but with variant_level > 0

  get_auto_start() → bool

    Return true if this message will cause an owner for the destination name to be auto-started.

  get_destination() → str or None

    Return the message’s destination bus name, or None if none.

  get_error_name() → str or None
  get_interface() → str or None
  get_member() → str or None
  get_no_reply() → bool

    Return true if this message need not be replied to.

  get_path() → ObjectPath or None

    Return the message’s destination object path (if it’s a method call) or source object path (if it’s a method reply or a signal) or None (if it has no path).

  get_path_decomposed() → list of str, or None

    Return a list of path components (e.g. /foo/bar -> [‘foo’,’bar’], / -> []) or None if the message has no associated path.

  get_reply_serial() → long

    Returns the serial that the message is a reply to or 0 if none.

  get_sender() → str or None

    Return the message’s sender unique name, or None if none.

  get_serial() → long

    Returns the serial of a message or 0 if none has been specified.

    The message’s serial number is provided by the application sending the message and is used to identify replies to this message. All messages received on a connection will have a serial, but messages you haven’t sent yet may return 0.

  get_signature() → Signature or None
  get_type() → int

    Returns the type of the message.

  static guess_signature(*args) → Signature [static method]

    Guess a D-Bus signature which should be used to encode the given Python objects.

    The signature is constructed as follows:

    Python | D-Bus
    --- | ---
    D-Bus type, variant_level > 0 | variant (v)
    D-Bus type, variant_level == 0 | the corresponding type
    anything with a __dbus_object_path__ attribute | object path
    bool | boolean (y)
    any other int subclass | int32 (i)
    any other long subclass | int64 (x)
    any other float subclass | double (d)
    any other str subclass | string (s)
    any other unicode subclass | string (s)
    any other tuple subclass | struct ((…))
    any other list subclass | array (a…), guess contents’ type according to type of first item
    any other dict subclass | dict (a{…}), guess key, value type according to types for an arbitrary item
    anything else | raise TypeError

  has_destination(bus_name: str) → bool
  has_interface(interface: str or None) → bool
  has_member(name: str or None) → bool
  has_path(name: str or None) → bool
  has_sender(unique_name: str) → bool
  has_signature(signature: str) → bool
  is_error(error: str) → bool
  is_method_call(interface: str, member: str) → bool
  is_signal(interface: str, member: str) → bool
  set_allow_interactive_authorization(bool) → None

    Set allow interactive authorization flag to this message.

  set_auto_start(bool) → None

    Set whether this message will cause an owner for the destination name to be auto-started.

  set_destination(bus_name: str or None)
  set_error_name(name: str or None)
  set_interface(name: str or None)
  set_member(unique_name: str or None)
  set_no_reply(bool) → None

    Set whether no reply to this message is required.

  set_path(name: str or None)
  set_reply_serial(bool) → None

    Set the serial that this message is a reply to.

  set_sender(unique_name: str or None)