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Gio::DBus::Message Class Reference
D-Bus API

A type for representing D-Bus messages that can be sent or received on a Connection. More...

`#include <giomm/dbusmessage.h>`

Inheritance diagram for Gio::DBus::Message:
[legend]

## Public Types
enum | ByteOrder { BYTE_ORDER_BIG_ENDIAN = 'B', BYTE_ORDER_LITTLE_ENDIAN = 'l' }
Public Types inherited from Glib::Object
typedef void(* | DestroyNotify )(gpointer data)

## Public Member Functions
virtual | ~Message ()
GDBusMessage* | gobj ()
| Provides access to the underlying C GObject.
const GDBusMessage* | gobj () const
| Provides access to the underlying C GObject.
GDBusMessage* | gobj_copy ()
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
Glib::ustring | print (guint indent)
| Produces a human-readable multi-line description of message.
bool | get_locked () const
| Checks whether message is locked.
void | lock ()
| If message is locked, does nothing.
Glib::RefPtr< Message > | copy () const
| Copies message.
MessageType | get_message_type () const
| Gets the type of message.
void | set_message_type (MessageType type)
| Sets message to be of type.
ByteOrder | get_byte_order () const
| Gets the byte order of message.
void | set_byte_order (ByteOrder byte_order)
| Sets the byte order of message.
guint32 | get_serial () const
| Gets the serial for message.
void | set_serial (guint32 serial)
| Sets the serial for message.
MessageFlags | get_flags () const
| Gets the flags for message.
void | set_flags (MessageFlags flags)
| Sets the flags to set on message.
void | get_body (Glib::VariantBase& value) const
| Gets the body of a message.
void | set_body (const Glib::VariantBase& body)
| Sets the body message.
guint32 | get_num_unix_fds () const
| Gets the UNIX file descriptors associated with message, if any.
void | set_num_unix_fds (guint32 value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header field.
void | get_header (Glib::VariantBase& value, MessageHeaderField header_field) const
| Gets a header field on the message.
void | set_header (MessageHeaderField header_field, const Glib::VariantBase& value)
| Sets a header field on message.
Glib::ArrayHandle< guchar > | get_header_fields () const
| Gets an array of all header fields on message that are set.
Glib::ustring | get_destination () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_DESTINATION header field.
void | set_destination (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_DESTINATION header field.
Glib::ustring | get_error_name () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field.
void | set_error_name (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field.
Glib::ustring | get_interface () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_INTERFACE header field.
void | set_interface (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_INTERFACE header field.
Glib::ustring | get_member () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_MEMBER header field.
void | set_member (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_MEMBER header field.
Glib::ustring | get_path () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_PATH header field.
void | set_path (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_PATH header field.
guint32 | get_reply_serial () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL header field.
void | set_reply_serial (guint32 value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL header field.
Glib::ustring | get_sender () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_SENDER header field.
void | set_sender (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_SENDER header field.
Glib::ustring | get_signature () const
| Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field.
void | set_signature (const Glib::ustring& value)
| Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field.
Glib::ustring | get_arg0 () const
| Convenience to get the first item in the body of message.
guchar* | to_blob (gsize& out_size, CapabilityFlags capabilities=CAPABILITY_FLAGS_NONE)
| Serializes message to a blob.
void | to_exception ()
| If message is not of type DBUS_MESSAGE_TYPE_ERROR does nothing and returns `false`.
Glib::PropertyProxy_ReadOnly < bool > | property_locked () const
| Whether the message is locked.
Public Member Functions inherited from Glib::Object
void* | get_data (const QueryQuark& key)
void | set_data (const Quark& key, void* data)
void | set_data (const Quark& key, void* data, DestroyNotify notify)
void | remove_data (const QueryQuark& quark)
void* | steal_data (const QueryQuark& quark)
Public Member Functions inherited from Glib::ObjectBase
void | set_property_value (const Glib::ustring& property_name, const Glib::ValueBase& value)
| You probably want to use a specific property_*() accessor method instead.
void | get_property_value (const Glib::ustring& property_name, Glib::ValueBase& value) const
| You probably want to use a specific property_*() accessor method instead.
template<class PropertyType >
void | set_property (const Glib::ustring& property_name, const PropertyType& value)
| You probably want to use a specific property_*() accessor method instead.
template<class PropertyType >
void | get_property (const Glib::ustring& property_name, PropertyType& value) const
| You probably want to use a specific property_*() accessor method instead.
void | connect_property_changed (const Glib::ustring& property_name, const sigc::slot< void >& slot)
| You can use the signal_changed() signal of the property proxy instead, but this is necessary when using the reduced API.
sigc::connection | connect_property_changed_with_return (const Glib::ustring& property_name, const sigc::slot< void >& slot)
| You can use the signal_changed() signal of the property proxy instead, but this is necessary when using the reduced API.
void | freeze_notify ()
| Increases the freeze count on object.
void | thaw_notify ()
| Reverts the effect of a previous call to freeze_notify().
virtual void | reference () const
| Increment the reference count for this object.
virtual void | unreference () const
| Decrement the reference count for this object.
GObject* | gobj ()
| Provides access to the underlying C GObject.
const GObject* | gobj () const
| Provides access to the underlying C GObject.
GObject* | gobj_copy () const
| Give a ref-ed copy to someone. Use for direct struct access.
Public Member Functions inherited from sigc::trackable
| trackable (const trackable &src)
trackable & | operator= (const trackable &src)
void | add_destroy_notify_callback (void *data, func_destroy_notify func) const
void | remove_destroy_notify_callback (void *data) const
void | notify_callbacks ()

## Static Public Member Functions
static GType | get_type ()
| Get the GType for this class, for use with the underlying GObject type system.
static Glib::RefPtr< Message > | create ()
| Creates a new empty DBusMessage.
static Glib::RefPtr< Message > | create_signal (const Glib::ustring& path, const Glib::ustring& interface, const Glib::ustring& signal)
| Creates a new DBusMessage for a signal emission.
static Glib::RefPtr< Message > | create_method_call (const Glib::ustring& name, const Glib::ustring& path, const Glib::ustring& interface, const Glib::ustring& method)
| Creates a new DBusMessage for a method call.
static Glib::RefPtr< Message > | create_method_reply (const Glib::RefPtr< Message >& method_call_message)
| Creates a new DBusMessage that is a reply to method_call_message.
static Glib::RefPtr< Message > | create_method_error_literal (const Glib::RefPtr< const Message >& method_call_message, const Glib::ustring& error_name, const Glib::ustring& error_message)
| Creates a new DBusMessage that is an error reply to method_call_message.
static Glib::RefPtr< Message > | create_from_blob (const guchar* blob, gsize blob_len, CapabilityFlags capabilities=CAPABILITY_FLAGS_NONE)
| Creates a new DBusMessage from the data stored at blob.
static gssize | bytes_needed (const guchar* blob, gsize blob_len)
| Utility function to calculate how many bytes are needed to completely deserialize the D-Bus message stored at blob.

## Protected Member Functions
| Message ()
Protected Member Functions inherited from Glib::Object
| Object ()
| Object (const Glib::ConstructParams& construct_params)
| Object (GObject* castitem)
virtual | ~Object ()
Protected Member Functions inherited from Glib::ObjectBase
| ObjectBase ()
| This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor.
| ObjectBase (const char* custom_type_name)
| A derived constructor always overrides this choice.
| ObjectBase (const std::type_info& custom_type_info)
| This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually.
virtual | ~ObjectBase ()=0
void | initialize (GObject* castitem)

## Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Gio::DBus::Message > | wrap (GDBusMessage* object, bool take_copy=false)
| A Glib::wrap() method for this object.
Related Functions inherited from Glib::Object
Glib::RefPtr< Glib::Object > | wrap (GObject* object, bool take_copy=false)

## Detailed Description

A type for representing D-Bus messages that can be sent or received on a Connection.

Since glibmm 2.28:

## Member Enumeration Documentation

enum Gio::DBus::Message::ByteOrder

Enumerator:

  BYTE_ORDER_BIG_ENDIAN |
  BYTE_ORDER_LITTLE_ENDIAN |

## Constructor & Destructor Documentation

virtual Gio::DBus::Message::~Message | ( |  | ) |
| virtual

Gio::DBus::Message::Message | ( |  | ) |
| protected

## Member Function Documentation

static gssize Gio::DBus::Message::bytes_needed | ( | const guchar * | blob,
|  | gsize | blob_len
| ) |  |
| static

Utility function to calculate how many bytes are needed to completely deserialize the D-Bus message stored at blob.

Since glibmm 2.26:

Parameters

  blob | A blob represent a binary D-Bus message.
  blob_len | The length of blob (must be at least 16).

Returns
  Number of bytes needed or -1 if error is set (e.g. if blob contains invalid data or not enough data is available to determine the size).

Glib::RefPtr<Message> Gio::DBus::Message::copy | ( |  | ) | const

Copies message.

The copy is a deep copy and the returned DBusMessage is completely identical except that it is guaranteed to not be locked.

This operation can fail if e.g. message contains file descriptors and the per-process or system-wide open files limit is reached.

Since glibmm 2.26:

Returns
  A new DBusMessage or `0` if error is set. Free with Glib::object_unref().

static Glib::RefPtr<Message> Gio::DBus::Message::create | ( |  | ) |
| static

Creates a new empty DBusMessage.

Since glibmm 2.26:

Returns
  A DBusMessage. Free with Glib::object_unref().

static Glib::RefPtr<Message> Gio::DBus::Message::create_from_blob | ( | const guchar * | blob,
|  | gsize | blob_len,
|  | CapabilityFlags | capabilities = `CAPABILITY_FLAGS_NONE`
| ) |  |
| static

Creates a new DBusMessage from the data stored at blob.

The byte order that the message was in can be retrieved using g_dbus_message_get_byte_order().

Since glibmm 2.26:

Parameters

  blob | A blob represent a binary D-Bus message.
  blob_len | The length of blob.
  capabilities | A DBusCapabilityFlags describing what protocol features are supported.

Returns
  A new DBusMessage or `0` if error is set. Free with Glib::object_unref().

static Glib::RefPtr<Message> Gio::DBus::Message::create_method_call | ( | const Glib::ustring& | name,
|  | const Glib::ustring& | path,
|  | const Glib::ustring& | interface,
|  | const Glib::ustring& | method
| ) |  |
| static

Creates a new DBusMessage for a method call.

Since glibmm 2.26:

Parameters

  name | A valid D-Bus name or `0`.
  path | A valid object path.
  interface | A valid D-Bus interface name or `0`.
  method | A valid method name.

Returns
  A DBusMessage. Free with Glib::object_unref().

static Glib::RefPtr<Message> Gio::DBus::Message::create_method_error_literal | ( | const Glib::RefPtr< const Message >& | method_call_message,
|  | const Glib::ustring& | error_name,
|  | const Glib::ustring& | error_message
| ) |  |
| static

Creates a new DBusMessage that is an error reply to method_call_message.

Since glibmm 2.26:

Parameters

  error_name | A valid D-Bus error name.
  error_message | The D-Bus error message.

Returns
  A DBusMessage. Free with Glib::object_unref().

static Glib::RefPtr<Message> Gio::DBus::Message::create_method_reply | ( | const Glib::RefPtr< Message >& | method_call_message | ) |
| static

Creates a new DBusMessage that is a reply to method_call_message.

Since glibmm 2.26:

Returns
  DBusMessage. Free with Glib::object_unref().

static Glib::RefPtr<Message> Gio::DBus::Message::create_signal | ( | const Glib::ustring& | path,
|  | const Glib::ustring& | interface,
|  | const Glib::ustring& | signal
| ) |  |
| static

Creates a new DBusMessage for a signal emission.

Since glibmm 2.26:

Parameters

  path | A valid object path.
  interface | A valid D-Bus interface name.
  signal | A valid signal name.

Returns
  A DBusMessage. Free with Glib::object_unref().

Glib::ustring Gio::DBus::Message::get_arg0 | ( |  | ) | const

Convenience to get the first item in the body of message.

Since glibmm 2.26:

Returns
  The string item or `0` if the first item in the body of message is not a string.

void Gio::DBus::Message::get_body | ( | Glib::VariantBase& | value | ) | const

Gets the body of a message.

The body is returned in value.

Parameters

  value | Location in which to store the header.

ByteOrder Gio::DBus::Message::get_byte_order | ( |  | ) | const

Gets the byte order of message.

Returns
  The byte order.

Glib::ustring Gio::DBus::Message::get_destination | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_DESTINATION header field.

Since glibmm 2.26:

Returns
  The value.

Glib::ustring Gio::DBus::Message::get_error_name | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field.

Since glibmm 2.26:

Returns
  The value.

MessageFlags Gio::DBus::Message::get_flags | ( |  | ) | const

Gets the flags for message.

Since glibmm 2.26:

Returns
  Flags that are set (typically values from the DBusMessageFlags enumeration bitwise ORed together).

void Gio::DBus::Message::get_header | ( | Glib::VariantBase& | value,
|  | MessageHeaderField | header_field
| ) |  | const

Gets a header field on the message.

The header is returned in value.

Parameters

  value | Location in which to store the header.
  header_field | The header field type.

Glib::ArrayHandle<guchar> Gio::DBus::Message::get_header_fields | ( |  | ) | const

Gets an array of all header fields on message that are set.

Since glibmm 2.26:

Returns
  An array of header fields terminated by DBUS_MESSAGE_HEADER_FIELD_INVALID. Each element is a #guchar. Free with Glib::free().

Glib::ustring Gio::DBus::Message::get_interface | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_INTERFACE header field.

Since glibmm 2.26:

Returns
  The value.

bool Gio::DBus::Message::get_locked | ( |  | ) | const

Checks whether message is locked.

To monitor changes to this value, conncet to the Object::signal_notify() signal to listen for changes on the DBusMessage::property_locked() property.

Since glibmm 2.26:

Returns
  `true` if message is locked, `false` otherwise.

Glib::ustring Gio::DBus::Message::get_member | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_MEMBER header field.

Since glibmm 2.26:

Returns
  The value.

MessageType Gio::DBus::Message::get_message_type | ( |  | ) | const

Gets the type of message.

Since glibmm 2.26:

Returns
  A 8-bit unsigned integer (typically a value from the DBusMessageType enumeration).

guint32 Gio::DBus::Message::get_num_unix_fds | ( |  | ) | const

Gets the UNIX file descriptors associated with message, if any.

This method is only available on UNIX.

Since glibmm 2.26:

Returns
  A UnixFDList or `0` if no file descriptors are associated. Do not free, this object is owned by message. Gets the UNIX file descriptors associated with message, if any.

This method is only available on UNIX.

Since glibmm 2.26:

Returns
  A UnixFDList or `0` if no file descriptors are associated. Do not free, this object is owned by message. Sets the UNIX file descriptors associated with message. As a side-effect the DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header field is set to the number of fds in fd_list (or cleared if fd_list is `0`).

This method is only available on UNIX.

Since glibmm 2.26:

Parameters

  fd_list | A UnixFDList or `0`. Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header field.

Since glibmm 2.26:

Returns
  The value.

Glib::ustring Gio::DBus::Message::get_path | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_PATH header field.

Since glibmm 2.26:

Returns
  The value.

guint32 Gio::DBus::Message::get_reply_serial | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL header field.

Since glibmm 2.26:

Returns
  The value.

Glib::ustring Gio::DBus::Message::get_sender | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_SENDER header field.

Since glibmm 2.26:

Returns
  The value.

guint32 Gio::DBus::Message::get_serial | ( |  | ) | const

Gets the serial for message.

Since glibmm 2.26:

Returns
  A #guint32.

Glib::ustring Gio::DBus::Message::get_signature | ( |  | ) | const

Convenience getter for the DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field.

Since glibmm 2.26:

Returns
  The value.

static GType Gio::DBus::Message::get_type | ( |  | ) |
| static

Get the GType for this class, for use with the underlying GObject type system.

GDBusMessage* Gio::DBus::Message::gobj | ( |  | ) |
| inline

Provides access to the underlying C GObject.

const GDBusMessage* Gio::DBus::Message::gobj | ( |  | ) | const
| inline

Provides access to the underlying C GObject.

GDBusMessage* Gio::DBus::Message::gobj_copy | ( |  | ) |

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

void Gio::DBus::Message::lock | ( |  | ) |

If message is locked, does nothing.

Otherwise locks the message.

Since glibmm 2.26:

Glib::ustring Gio::DBus::Message::print | ( | guint | indent | ) |

Produces a human-readable multi-line description of message.

The contents of the description has no ABI guarantees, the contents and formatting is subject to change at any time. Typical output looks something like this:

Type: method-call Flags: none Version: 0 Serial: 4 Headers: path -> objectpath '/org/gtk/GDBus/TestObject' interface -> 'org.gtk.GDBus.TestInterface' member -> 'GimmeStdout' destination -> ':1.146' Body: () UNIX File Descriptors: (none)

or

Type: method-return Flags: no-reply-expected Version: 0 Serial: 477 Headers: reply-serial -> uint32 4 destination -> ':1.159' sender -> ':1.146' num-unix-fds -> uint32 1 Body: () UNIX File Descriptors: fd 12: dev=0:10,mode=020620,ino=5,uid=500,gid=5,rdev=136:2,size=0,atime=1273085037,mtime=1273085851,ctime=1272982635

Since glibmm 2.26:

Parameters

  indent | Indentation level.

Returns
  A string that should be freed with Glib::free().

Glib::PropertyProxy_ReadOnly< bool > Gio::DBus::Message::property_locked | ( |  | ) | const

Whether the message is locked.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns
  A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

void Gio::DBus::Message::set_body | ( | const Glib::VariantBase& | body | ) |

Sets the body message.

As a side-effect the DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field is set to the type string of body (or cleared if body is `0`).

If body is floating, message assumes ownership of body.

Since glibmm 2.26:

Parameters

  body | Either `0` or a Variant that is a tuple.

void Gio::DBus::Message::set_byte_order | ( | ByteOrder | byte_order | ) |

Sets the byte order of message.

Parameters

  byte_order | The byte order.

void Gio::DBus::Message::set_destination | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_DESTINATION header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_error_name | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_flags | ( | MessageFlags | flags | ) |

Sets the flags to set on message.

Since glibmm 2.26:

Parameters

  flags | Flags for message that are set (typically values from the DBusMessageFlags enumeration bitwise ORed together).

void Gio::DBus::Message::set_header | ( | MessageHeaderField | header_field,
|  | const Glib::VariantBase& | value
| ) |  |

Sets a header field on message.

If value is floating, message assumes ownership of value.

Since glibmm 2.26:

Parameters

  header_field | A 8-bit unsigned integer (typically a value from the DBusMessageHeaderField enumeration).
  value | A Variant to set the header field or `0` to clear the header field.

void Gio::DBus::Message::set_interface | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_INTERFACE header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_member | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_MEMBER header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_message_type | ( | MessageType | type | ) |

Sets message to be of type.

Since glibmm 2.26:

Parameters

  type | A 8-bit unsigned integer (typically a value from the DBusMessageType enumeration).

void Gio::DBus::Message::set_num_unix_fds | ( | guint32 | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_path | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_PATH header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_reply_serial | ( | guint32 | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_sender | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_SENDER header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

void Gio::DBus::Message::set_serial | ( | guint32 | serial | ) |

Sets the serial for message.

Since glibmm 2.26:

Parameters

  serial | A #guint32.

void Gio::DBus::Message::set_signature | ( | const Glib::ustring& | value | ) |

Convenience setter for the DBUS_MESSAGE_HEADER_FIELD_SIGNATURE header field.

Since glibmm 2.26:

Parameters

  value | The value to set.

guchar* Gio::DBus::Message::to_blob | ( | gsize & | out_size,
|  | CapabilityFlags | capabilities = `CAPABILITY_FLAGS_NONE`
| ) |  |

Serializes message to a blob.

The byte order returned by g_dbus_message_get_byte_order() will be used.

Since glibmm 2.26:

Parameters

  out_size | Return location for size of generated blob.
  capabilities | A DBusCapabilityFlags describing what protocol features are supported.

Returns
  A pointer to a valid binary D-Bus message of out_size bytes generated by message or `0` if error is set. Free with Glib::free().

void Gio::DBus::Message::to_exception | ( |  | ) |

If message is not of type DBUS_MESSAGE_TYPE_ERROR does nothing and returns `false`.

Otherwise this method encodes the error in message as a Error using g_dbus_error_set_dbus_error() using the information in the DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME header field of message as well as the first string item in message's body.

Since glibmm 2.26:

Returns
  `true` if error was set, `false` otherwise.

## Friends And Related Function Documentation

Glib::RefPtr< Gio::DBus::Message > wrap | ( | GDBusMessage * | object,
|  | bool | take_copy = `false`
| ) |  |
| related

A Glib::wrap() method for this object.

Parameters

  object | The C instance.
  take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns
  A C++ instance that wraps this C instance.