Gio.DBusConnection.call

### Method

# Gio DBusConnectioncall

since: 2.26

#### Declaration [src]

    void
    g_dbus_connection_call (
      GDBusConnection* connection,
      const gchar* bus_name,
      const gchar* object_path,
      const gchar* interface_name,
      const gchar* method_name,
      GVariant* parameters,
      const GVariantType* reply_type,
      GDBusCallFlags flags,
      gint timeout_msec,
      GCancellable* cancellable,
      GAsyncReadyCallback callback,
      gpointer user_data
    )

#### Description [src]

Asynchronously invokes the `method_name` method on the `interface_name` D-Bus interface on the remote object at `object_path` owned by `bus_name`.

If `connection` is closed then the operation will fail with `G_IO_ERROR_CLOSED`. If `cancellable` is canceled, the operation will fail with `G_IO_ERROR_CANCELLED`. If `parameters` contains a value not compatible with the D-Bus protocol, the operation fails with `G_IO_ERROR_INVALID_ARGUMENT`.

If `reply_type` is non-`NULL` then the reply will be checked for having this type and an error will be raised if it does not match. Said another way, if you give a `reply_type` then any non-`NULL` return value will be of this type. Unless it’s `G_VARIANT_TYPE_UNIT`, the `reply_type` will be a tuple containing one or more values.

If the `parameters` `GVariant` is floating, it is consumed. This allows convenient ‘inline’ use of g_variant_new(), e.g.:

     g_dbus_connection_call (connection,
                             "org.freedesktop.StringThings",
                             "/org/freedesktop/StringThings",
                             "org.freedesktop.StringThings",
                             "TwoStrings",
                             g_variant_new ("(ss)",
                                            "Thing One",
                                            "Thing Two"),
                             NULL,
                             G_DBUS_CALL_FLAGS_NONE,
                             -1,
                             NULL,
                             (GAsyncReadyCallback) two_strings_done,
                             NULL);

This is an asynchronous method. When the operation is finished, `callback` will be invoked in the thread-default main context (see `g_main_context_push_thread_default()`) of the thread you are calling this method from. You can then call `g_dbus_connection_call_finish()` to get the result of the operation. See `g_dbus_connection_call_sync()` for the synchronous version of this function.

If `callback` is `NULL` then the D-Bus method call message will be sent with the `G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED` flag set.

Available since: 2.26

This method completes asynchronously. Use `g_dbus_connection_call_finish()` inside the `GAsyncReadyCallback` to obtain the result of the operation.

#### Parameters

`bus_name`

  Type: `const gchar*`

  A unique or well-known bus name or `NULL` if `connection` is not a message bus connection.

  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 invoke method on.

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

`method_name`

  Type: `const gchar*`

  The name of the method to invoke.

  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 method or `NULL` if not passing parameters.

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

`reply_type`

  Type: `GVariantType`

  The expected type of the reply (which will be a tuple), or `NULL`.

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

`flags`

  Type: `GDBusCallFlags`

  Flags from the `GDBusCallFlags` enumeration.

`timeout_msec`

  Type: `gint`

  The timeout in milliseconds, -1 to use the default timeout or `G_MAXINT` for no timeout.

`cancellable`

  Type: `GCancellable`

  A `GCancellable` or `NULL`.

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

`callback`

  Type: `GAsyncReadyCallback`

  A `GAsyncReadyCallback` to call when the request is satisfied or `NULL` if you don’t care about the result of the method invocation.

  The argument can be `NULL`.

`user_data`

  Type: `gpointer`

  The data to pass to `callback`.

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