Gio.DBusConnection.emit_signal

### Method

# Gio DBusConnectionemit_signal

since: 2.26

#### Declaration [src]

    gboolean
    g_dbus_connection_emit_signal (
      GDBusConnection* connection,
      const gchar* destination_bus_name,
      const gchar* object_path,
      const gchar* interface_name,
      const gchar* signal_name,
      GVariant* parameters,
      GError** error
    )

#### Description [src]

Emits a signal.

If the parameters GVariant is floating, it is consumed.

This can only fail if `parameters` is not compatible with the D-Bus protocol (`G_IO_ERROR_INVALID_ARGUMENT`), or if `connection` has been closed (`G_IO_ERROR_CLOSED`).

Available since: 2.26

#### Parameters

`destination_bus_name`

  Type: `const gchar*`

  The unique bus name for the destination for the signal or `NULL` to emit to all listeners.

  The argument can be `NULL`.
  The data is owned by the caller of the method.
  The value is a NUL terminated UTF-8 string.

`object_path`

  Type: `const gchar*`

  Path of remote object.

  The data is owned by the caller of the method.
  The value is a NUL terminated UTF-8 string.

`interface_name`

  Type: `const gchar*`

  D-Bus interface to emit a signal on.

  The data is owned by the caller of the method.
  The value is a NUL terminated UTF-8 string.

`signal_name`

  Type: `const gchar*`

  The name of the signal to emit.

  The data is owned by the caller of the method.
  The value is a NUL terminated UTF-8 string.

`parameters`

  Type: `GVariant`

  A `GVariant` tuple with parameters for the signal or `NULL` if not passing parameters.

  The argument can be `NULL`.
  The data is owned by the caller of the method.

`error`

  Type: `GError **`

  The return location for a recoverable error.

  The argument can be `NULL`.
  If the return location is not `NULL`, then you must initialize it to a `NULL` `GError*`.
  The argument will be left initialized to `NULL` by the method if there are no errors.
  In case of error, the argument will be set to a newly allocated `GError`; the caller will take ownership of the data, and be responsible for freeing it.

#### Return value

Type: `gboolean`

`TRUE` unless `error` is set.