## GDBusMessage

GDBusMessage — D-Bus Message

## Synopsis

    #include <gio/gio.h>

                        GDBusMessage;
    enum                GDBusMessageType;
    enum                GDBusMessageFlags;
    enum                GDBusMessageHeaderField;
    enum                GDBusMessageByteOrder;
    GDBusMessage *      g_dbus_message_new                  (void);
    GDBusMessage *      g_dbus_message_new_signal           (const gchar *path,
                                                             const gchar *interface_,
                                                             const gchar *signal);
    GDBusMessage *      g_dbus_message_new_method_call      (const gchar *name,
                                                             const gchar *path,
                                                             const gchar *interface_,
                                                             const gchar *method);
    GDBusMessage *      g_dbus_message_new_method_reply     (GDBusMessage *method_call_message);
    GDBusMessage *      g_dbus_message_new_method_error     (GDBusMessage *method_call_message,
                                                             const gchar *error_name,
                                                             const gchar *error_message_format,
                                                             ...);
    GDBusMessage *      g_dbus_message_new_method_error_valist
                                                            (GDBusMessage *method_call_message,
                                                             const gchar *error_name,
                                                             const gchar *error_message_format,
                                                             va_list var_args);
    GDBusMessage *      g_dbus_message_new_method_error_literal
                                                            (GDBusMessage *method_call_message,
                                                             const gchar *error_name,
                                                             const gchar *error_message);
    gchar *             g_dbus_message_print                (GDBusMessage *message,
                                                             guint indent);
    gboolean            g_dbus_message_get_locked           (GDBusMessage *message);
    void                g_dbus_message_lock                 (GDBusMessage *message);
    GDBusMessage *      g_dbus_message_copy                 (GDBusMessage *message,
                                                             GError **error);
    GDBusMessageByteOrder g_dbus_message_get_byte_order     (GDBusMessage *message);
    void                g_dbus_message_set_byte_order       (GDBusMessage *message,
                                                             GDBusMessageByteOrder byte_order);
    GDBusMessageType    g_dbus_message_get_message_type     (GDBusMessage *message);
    void                g_dbus_message_set_message_type     (GDBusMessage *message,
                                                             GDBusMessageType type);
    guint32             g_dbus_message_get_serial           (GDBusMessage *message);
    void                g_dbus_message_set_serial           (GDBusMessage *message,
                                                             guint32 serial);
    GDBusMessageFlags   g_dbus_message_get_flags            (GDBusMessage *message);
    void                g_dbus_message_set_flags            (GDBusMessage *message,
                                                             GDBusMessageFlags flags);
    GVariant *          g_dbus_message_get_body             (GDBusMessage *message);
    void                g_dbus_message_set_body             (GDBusMessage *message,
                                                             GVariant *body);
    GUnixFDList *       g_dbus_message_get_unix_fd_list     (GDBusMessage *message);
    void                g_dbus_message_set_unix_fd_list     (GDBusMessage *message,
                                                             GUnixFDList *fd_list);
    guint32             g_dbus_message_get_num_unix_fds     (GDBusMessage *message);
    void                g_dbus_message_set_num_unix_fds     (GDBusMessage *message,
                                                             guint32 value);
    guchar *            g_dbus_message_get_header_fields    (GDBusMessage *message);
    GVariant *          g_dbus_message_get_header           (GDBusMessage *message,
                                                             GDBusMessageHeaderField header_field);
    void                g_dbus_message_set_header           (GDBusMessage *message,
                                                             GDBusMessageHeaderField header_field,
                                                             GVariant *value);
    const gchar *       g_dbus_message_get_destination      (GDBusMessage *message);
    void                g_dbus_message_set_destination      (GDBusMessage *message,
                                                             const gchar *value);
    const gchar *       g_dbus_message_get_error_name       (GDBusMessage *message);
    void                g_dbus_message_set_error_name       (GDBusMessage *message,
                                                             const gchar *value);
    const gchar *       g_dbus_message_get_interface        (GDBusMessage *message);
    void                g_dbus_message_set_interface        (GDBusMessage *message,
                                                             const gchar *value);
    const gchar *       g_dbus_message_get_member           (GDBusMessage *message);
    void                g_dbus_message_set_member           (GDBusMessage *message,
                                                             const gchar *value);
    const gchar *       g_dbus_message_get_path             (GDBusMessage *message);
    void                g_dbus_message_set_path             (GDBusMessage *message,
                                                             const gchar *value);
    guint32             g_dbus_message_get_reply_serial     (GDBusMessage *message);
    void                g_dbus_message_set_reply_serial     (GDBusMessage *message,
                                                             guint32 value);
    const gchar *       g_dbus_message_get_sender           (GDBusMessage *message);
    void                g_dbus_message_set_sender           (GDBusMessage *message,
                                                             const gchar *value);
    const gchar *       g_dbus_message_get_signature        (GDBusMessage *message);
    void                g_dbus_message_set_signature        (GDBusMessage *message,
                                                             const gchar *value);
    const gchar *       g_dbus_message_get_arg0             (GDBusMessage *message);
    guchar *            g_dbus_message_to_blob              (GDBusMessage *message,
                                                             gsize *out_size,
                                                             GDBusCapabilityFlags capabilities,
                                                             GError **error);
    gssize              g_dbus_message_bytes_needed         (guchar *blob,
                                                             gsize blob_len,
                                                             GError **error);
    GDBusMessage *      g_dbus_message_new_from_blob        (guchar *blob,
                                                             gsize blob_len,
                                                             GDBusCapabilityFlags capabilities,
                                                             GError **error);
    gboolean            g_dbus_message_to_gerror            (GDBusMessage *message,
                                                             GError **error);

## Object Hierarchy

      GObject
       +----GDBusMessage

## Properties

      "locked"                   gboolean              : Read

## Description

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

## Details

### GDBusMessage

    typedef struct _GDBusMessage GDBusMessage;

The GDBusMessage structure contains only private data and should only be accessed using the provided API.

Since 2.26

### enum GDBusMessageType

    typedef enum {
      G_DBUS_MESSAGE_TYPE_INVALID,
      G_DBUS_MESSAGE_TYPE_METHOD_CALL,
      G_DBUS_MESSAGE_TYPE_METHOD_RETURN,
      G_DBUS_MESSAGE_TYPE_ERROR,
      G_DBUS_MESSAGE_TYPE_SIGNAL
    } GDBusMessageType;

Message types used in GDBusMessage.

`G_DBUS_MESSAGE_TYPE_INVALID` | Message is of invalid type.
`G_DBUS_MESSAGE_TYPE_METHOD_CALL` | Method call.
`G_DBUS_MESSAGE_TYPE_METHOD_RETURN` | Method reply.
`G_DBUS_MESSAGE_TYPE_ERROR` | Error reply.
`G_DBUS_MESSAGE_TYPE_SIGNAL` | Signal emission.

Since 2.26

### enum GDBusMessageFlags

    typedef enum {
      G_DBUS_MESSAGE_FLAGS_NONE = 0,
      G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED = (1<<0),
      G_DBUS_MESSAGE_FLAGS_NO_AUTO_START = (1<<1)
    } GDBusMessageFlags;

Message flags used in GDBusMessage.

`G_DBUS_MESSAGE_FLAGS_NONE` | No flags set.
`G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED` | A reply is not expected.
`G_DBUS_MESSAGE_FLAGS_NO_AUTO_START` | The bus must not launch an owner for the destination name in response to this message.

Since 2.26

### enum GDBusMessageHeaderField

    typedef enum {
      G_DBUS_MESSAGE_HEADER_FIELD_INVALID,
      G_DBUS_MESSAGE_HEADER_FIELD_PATH,
      G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE,
      G_DBUS_MESSAGE_HEADER_FIELD_MEMBER,
      G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME,
      G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL,
      G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION,
      G_DBUS_MESSAGE_HEADER_FIELD_SENDER,
      G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE,
      G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS
    } GDBusMessageHeaderField;

Header fields used in GDBusMessage.

`G_DBUS_MESSAGE_HEADER_FIELD_INVALID` | Not a valid header field.
`G_DBUS_MESSAGE_HEADER_FIELD_PATH` | The object path.
`G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE` | The interface name.
`G_DBUS_MESSAGE_HEADER_FIELD_MEMBER` | The method or signal name.
`G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME` | The name of the error that occurred.
`G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL` | The serial number the message is a reply to.
`G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION` | The name the message is intended for.
`G_DBUS_MESSAGE_HEADER_FIELD_SENDER` | Unique name of the sender of the message (filled in by the bus).
`G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE` | The signature of the message body.
`G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS` | The number of UNIX file descriptors that accompany the message.

Since 2.26

### enum GDBusMessageByteOrder

    typedef enum {
      G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN    = 'B',
      G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN = 'l'
    } GDBusMessageByteOrder;

Enumeration used to describe the byte order of a D-Bus message.

`G_DBUS_MESSAGE_BYTE_ORDER_BIG_ENDIAN` | The byte order is big endian.
`G_DBUS_MESSAGE_BYTE_ORDER_LITTLE_ENDIAN` | The byte order is little endian.

Since 2.26

### g_dbus_message_new ()

    GDBusMessage *      g_dbus_message_new                  (void);

Creates a new empty GDBusMessage.

Returns : | A GDBusMessage. Free with `g_object_unref()`.

Since 2.26

### g_dbus_message_new_signal ()

    GDBusMessage *      g_dbus_message_new_signal           (const gchar *path,
                                                             const gchar *interface_,
                                                             const gchar *signal);

Creates a new GDBusMessage for a signal emission.

`path` : | A valid object path.
`interface_` : | A valid D-Bus interface name.
`signal` : | A valid signal name.
Returns : | A GDBusMessage. Free with `g_object_unref()`.

Since 2.26

### g_dbus_message_new_method_call ()

    GDBusMessage *      g_dbus_message_new_method_call      (const gchar *name,
                                                             const gchar *path,
                                                             const gchar *interface_,
                                                             const gchar *method);

Creates a new GDBusMessage for a method call.

`name` : | A valid D-Bus name or `NULL`. [allow-none]
`path` : | A valid object path.
`interface_` : | A valid D-Bus interface name or `NULL`. [allow-none]
`method` : | A valid method name.
Returns : | A GDBusMessage. Free with `g_object_unref()`.

Since 2.26

### g_dbus_message_new_method_reply ()

    GDBusMessage *      g_dbus_message_new_method_reply     (GDBusMessage *method_call_message);

Creates a new GDBusMessage that is a reply to `method_call_message`.

`method_call_message` : | A message of type `G_DBUS_MESSAGE_TYPE_METHOD_CALL` to create a reply message to.
Returns : | GDBusMessage. Free with `g_object_unref()`. [transfer full]

Since 2.26

### g_dbus_message_new_method_error ()

    GDBusMessage *      g_dbus_message_new_method_error     (GDBusMessage *method_call_message,
                                                             const gchar *error_name,
                                                             const gchar *error_message_format,
                                                             ...);

Creates a new GDBusMessage that is an error reply to `method_call_message`.

`method_call_message` : | A message of type `G_DBUS_MESSAGE_TYPE_METHOD_CALL` to create a reply message to.
`error_name` : | A valid D-Bus error name.
`error_message_format` : | The D-Bus error message in a `printf()` format.
`...` : | Arguments for `error_message_format`.
Returns : | A GDBusMessage. Free with `g_object_unref()`. [transfer full]

Since 2.26

### g_dbus_message_new_method_error_valist ()

    GDBusMessage *      g_dbus_message_new_method_error_valist
                                                            (GDBusMessage *method_call_message,
                                                             const gchar *error_name,
                                                             const gchar *error_message_format,
                                                             va_list var_args);

Like `g_dbus_message_new_method_error()` but intended for language bindings.

`method_call_message` : | A message of type `G_DBUS_MESSAGE_TYPE_METHOD_CALL` to create a reply message to.
`error_name` : | A valid D-Bus error name.
`error_message_format` : | The D-Bus error message in a `printf()` format.
`var_args` : | Arguments for `error_message_format`.
Returns : | A GDBusMessage. Free with `g_object_unref()`. [transfer full]

Since 2.26

### g_dbus_message_new_method_error_literal ()

    GDBusMessage *      g_dbus_message_new_method_error_literal
                                                            (GDBusMessage *method_call_message,
                                                             const gchar *error_name,
                                                             const gchar *error_message);

Creates a new GDBusMessage that is an error reply to `method_call_message`.

`method_call_message` : | A message of type `G_DBUS_MESSAGE_TYPE_METHOD_CALL` to create a reply message to.
`error_name` : | A valid D-Bus error name.
`error_message` : | The D-Bus error message.
Returns : | A GDBusMessage. Free with `g_object_unref()`. [transfer full]

Since 2.26

### g_dbus_message_print ()

    gchar *             g_dbus_message_print                (GDBusMessage *message,
                                                             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

`message` : | A GDBusMessage.
`indent` : | Indentation level.
Returns : | A string that should be freed with `g_free()`.

Since 2.26

### g_dbus_message_get_locked ()

    gboolean            g_dbus_message_get_locked           (GDBusMessage *message);

Checks whether `message` is locked. To monitor changes to this value, conncet to the "notify" signal to listen for changes on the "locked" property.

`message` : | A GDBusMessage.
Returns : | `TRUE` if `message` is locked, `FALSE` otherwise.

Since 2.26

### g_dbus_message_lock ()

    void                g_dbus_message_lock                 (GDBusMessage *message);

If `message` is locked, does nothing. Otherwise locks the message.

`message` : | A GDBusMessage.

Since 2.26

### g_dbus_message_copy ()

    GDBusMessage *      g_dbus_message_copy                 (GDBusMessage *message,
                                                             GError **error);

Copies `message`. The copy is a deep copy and the returned GDBusMessage 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.

`message` : | A GDBusMessage.
`error` : | Return location for error or `NULL`.
Returns : | A new GDBusMessage or `NULL` if `error` is set. Free with `g_object_unref()`. [transfer full]

Since 2.26

### g_dbus_message_get_byte_order ()

    GDBusMessageByteOrder g_dbus_message_get_byte_order     (GDBusMessage *message);

Gets the byte order of `message`.

`message` : | A GDBusMessage.
Returns : | The byte order.

### g_dbus_message_set_byte_order ()

    void                g_dbus_message_set_byte_order       (GDBusMessage *message,
                                                             GDBusMessageByteOrder byte_order);

Sets the byte order of `message`.

`message` : | A GDBusMessage.
`byte_order` : | The byte order.

### g_dbus_message_get_message_type ()

    GDBusMessageType    g_dbus_message_get_message_type     (GDBusMessage *message);

Gets the type of `message`.

`message` : | A GDBusMessage.
Returns : | A 8-bit unsigned integer (typically a value from the GDBusMessageType enumeration).

Since 2.26

### g_dbus_message_set_message_type ()

    void                g_dbus_message_set_message_type     (GDBusMessage *message,
                                                             GDBusMessageType type);

Sets `message` to be of `type`.

`message` : | A GDBusMessage.
`type` : | A 8-bit unsigned integer (typically a value from the GDBusMessageType enumeration).

Since 2.26

### g_dbus_message_get_serial ()

    guint32             g_dbus_message_get_serial           (GDBusMessage *message);

Gets the serial for `message`.

`message` : | A GDBusMessage.
Returns : | A guint32.

Since 2.26

### g_dbus_message_set_serial ()

    void                g_dbus_message_set_serial           (GDBusMessage *message,
                                                             guint32 serial);

Sets the serial for `message`.

`message` : | A GDBusMessage.
`serial` : | A guint32.

Since 2.26

### g_dbus_message_get_flags ()

    GDBusMessageFlags   g_dbus_message_get_flags            (GDBusMessage *message);

Gets the flags for `message`.

`message` : | A GDBusMessage.
Returns : | Flags that are set (typically values from the GDBusMessageFlags enumeration bitwise ORed together).

Since 2.26

### g_dbus_message_set_flags ()

    void                g_dbus_message_set_flags            (GDBusMessage *message,
                                                             GDBusMessageFlags flags);

Sets the flags to set on `message`.

`message` : | A GDBusMessage.
`flags` : | Flags for `message` that are set (typically values from the GDBusMessageFlags enumeration bitwise ORed together).

Since 2.26

### g_dbus_message_get_body ()

    GVariant *          g_dbus_message_get_body             (GDBusMessage *message);

Gets the body of a message.

`message` : | A GDBusMessage.
Returns : | A GVariant or `NULL` if the body is empty. Do not free, it is owned by `message`.

Since 2.26

### g_dbus_message_set_body ()

    void                g_dbus_message_set_body             (GDBusMessage *message,
                                                             GVariant *body);

Sets the body `message`. As a side-effect the `G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE` header field is set to the type string of `body` (or cleared if `body` is `NULL`).

If `body` is floating, `message` assumes ownership of `body`.

`message` : | A GDBusMessage.
`body` : | Either `NULL` or a GVariant that is a tuple.

Since 2.26

### g_dbus_message_get_unix_fd_list ()

    GUnixFDList *       g_dbus_message_get_unix_fd_list     (GDBusMessage *message);

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

This method is only available on UNIX.

`message` : | A GDBusMessage.
Returns : | A GUnixFDList or `NULL` if no file descriptors are associated. Do not free, this object is owned by `message`. [transfer none]

Since 2.26

### g_dbus_message_set_unix_fd_list ()

    void                g_dbus_message_set_unix_fd_list     (GDBusMessage *message,
                                                             GUnixFDList *fd_list);

Sets the UNIX file descriptors associated with `message`. As a side-effect the `G_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 `NULL`).

This method is only available on UNIX.

`message` : | A GDBusMessage.
`fd_list` : | A GUnixFDList or `NULL`. [allow-none]

Since 2.26

### g_dbus_message_get_num_unix_fds ()

    guint32             g_dbus_message_get_num_unix_fds     (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_num_unix_fds ()

    void                g_dbus_message_set_num_unix_fds     (GDBusMessage *message,
                                                             guint32 value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_NUM_UNIX_FDS` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_header_fields ()

    guchar *            g_dbus_message_get_header_fields    (GDBusMessage *message);

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

`message` : | A GDBusMessage.
Returns : | An array of header fields terminated by `G_DBUS_MESSAGE_HEADER_FIELD_INVALID`. Each element is a guchar. Free with `g_free()`. [array zero-terminated=1]

Since 2.26

### g_dbus_message_get_header ()

    GVariant *          g_dbus_message_get_header           (GDBusMessage *message,
                                                             GDBusMessageHeaderField header_field);

Gets a header field on `message`.

`message` : | A GDBusMessage.
`header_field` : | A 8-bit unsigned integer (typically a value from the GDBusMessageHeaderField enumeration)
Returns : | A GVariant with the value if the header was found, `NULL` otherwise. Do not free, it is owned by `message`.

Since 2.26

### g_dbus_message_set_header ()

    void                g_dbus_message_set_header           (GDBusMessage *message,
                                                             GDBusMessageHeaderField header_field,
                                                             GVariant *value);

Sets a header field on `message`.

If `value` is floating, `message` assumes ownership of `value`.

`message` : | A GDBusMessage.
`header_field` : | A 8-bit unsigned integer (typically a value from the GDBusMessageHeaderField enumeration)
`value` : | A GVariant to set the header field or `NULL` to clear the header field. [allow-none]

Since 2.26

### g_dbus_message_get_destination ()

    const gchar *       g_dbus_message_get_destination      (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_destination ()

    void                g_dbus_message_set_destination      (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_error_name ()

    const gchar *       g_dbus_message_get_error_name       (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_error_name ()

    void                g_dbus_message_set_error_name       (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_ERROR_NAME` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_interface ()

    const gchar *       g_dbus_message_get_interface        (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_interface ()

    void                g_dbus_message_set_interface        (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_INTERFACE` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_member ()

    const gchar *       g_dbus_message_get_member           (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_MEMBER` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_member ()

    void                g_dbus_message_set_member           (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_MEMBER` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_path ()

    const gchar *       g_dbus_message_get_path             (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_PATH` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_path ()

    void                g_dbus_message_set_path             (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_PATH` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_reply_serial ()

    guint32             g_dbus_message_get_reply_serial     (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_reply_serial ()

    void                g_dbus_message_set_reply_serial     (GDBusMessage *message,
                                                             guint32 value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_REPLY_SERIAL` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_sender ()

    const gchar *       g_dbus_message_get_sender           (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_SENDER` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_sender ()

    void                g_dbus_message_set_sender           (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_SENDER` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_signature ()

    const gchar *       g_dbus_message_get_signature        (GDBusMessage *message);

Convenience getter for the `G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE` header field.

`message` : | A GDBusMessage.
Returns : | The value.

Since 2.26

### g_dbus_message_set_signature ()

    void                g_dbus_message_set_signature        (GDBusMessage *message,
                                                             const gchar *value);

Convenience setter for the `G_DBUS_MESSAGE_HEADER_FIELD_SIGNATURE` header field.

`message` : | A GDBusMessage.
`value` : | The value to set.

Since 2.26

### g_dbus_message_get_arg0 ()

    const gchar *       g_dbus_message_get_arg0             (GDBusMessage *message);

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

`message` : | A GDBusMessage.
Returns : | The string item or `NULL` if the first item in the body of `message` is not a string.

Since 2.26

### g_dbus_message_to_blob ()

    guchar *            g_dbus_message_to_blob              (GDBusMessage *message,
                                                             gsize *out_size,
                                                             GDBusCapabilityFlags capabilities,
                                                             GError **error);

Serializes `message` to a blob. The byte order returned by `g_dbus_message_get_byte_order()` will be used.

`message` : | A GDBusMessage.
`out_size` : | Return location for size of generated blob.
`capabilities` : | A GDBusCapabilityFlags describing what protocol features are supported.
`error` : | Return location for error.
Returns : | A pointer to a valid binary D-Bus message of `out_size` bytes generated by `message` or `NULL` if `error` is set. Free with `g_free()`. [array length=out_size][transfer full]

Since 2.26

### g_dbus_message_bytes_needed ()

    gssize              g_dbus_message_bytes_needed         (guchar *blob,
                                                             gsize blob_len,
                                                             GError **error);

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

`blob` : | A blob represent a binary D-Bus message. [array length=blob_len][element-type guint8]
`blob_len` : | The length of `blob` (must be at least 16).
`error` : | Return location for error or `NULL`.
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).

Since 2.26

### g_dbus_message_new_from_blob ()

    GDBusMessage *      g_dbus_message_new_from_blob        (guchar *blob,
                                                             gsize blob_len,
                                                             GDBusCapabilityFlags capabilities,
                                                             GError **error);

Creates a new GDBusMessage from the data stored at `blob`. The byte order that the message was in can be retrieved using `g_dbus_message_get_byte_order()`.

`blob` : | A blob represent a binary D-Bus message. [array length=blob_len][element-type guint8]
`blob_len` : | The length of `blob`.
`capabilities` : | A GDBusCapabilityFlags describing what protocol features are supported.
`error` : | Return location for error or `NULL`.
Returns : | A new GDBusMessage or `NULL` if `error` is set. Free with `g_object_unref()`.

Since 2.26

### g_dbus_message_to_gerror ()

    gboolean            g_dbus_message_to_gerror            (GDBusMessage *message,
                                                             GError **error);

If `message` is not of type `G_DBUS_MESSAGE_TYPE_ERROR` does nothing and returns `FALSE`.

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

`message` : | A GDBusMessage.
`error` : | The GError to set.
Returns : | `TRUE` if `error` was set, `FALSE` otherwise.

Since 2.26

## Property Details

### The `"locked"` property

      "locked"                   gboolean              : Read

Whether the message is locked.

Default value: FALSE