Gio.DBusProxy.call_sync

### Method

# Gio DBusProxycall_sync

since: 2.26

#### Declaration

    GVariant*
    g_dbus_proxy_call_sync (
      GDBusProxy* proxy,
      const gchar* method_name,
      GVariant* parameters,
      GDBusCallFlags flags,
      gint timeout_msec,
      GCancellable* cancellable,
      GError** error
    )

#### Description

Synchronously invokes the `method_name` method on `proxy`.

If `method_name` contains any dots, then `name` is split into interface and method name parts. This allows using `proxy` for invoking methods on other interfaces.

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

     g_dbus_proxy_call_sync (proxy,
                             "TwoStrings",
                             g_variant_new ("(ss)",
                                            "Thing One",
                                            "Thing Two"),
                             G_DBUS_CALL_FLAGS_NONE,
                             -1,
                             NULL,
                             &error);

The calling thread is blocked until a reply is received. See `g_dbus_proxy_call()` for the asynchronous version of this method.

If `proxy` has an expected interface (see `GDBusProxy:g-interface-info`) and `method_name` is referenced by it, then the return value is checked against the return type.

Available since: 2.26

#### Parameters

`method_name`

  Type: `const gchar*`

  Name of 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 signal or `NULL` if not passing parameters.

  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 (with `G_MAXINT` meaning “infinite”) or -1 to use the proxy default timeout.

`cancellable`

  Type: `GCancellable`

  A `GCancellable` or `NULL`.

  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: `GVariant`

`NULL` if `error` is set. Otherwise a `GVariant` tuple with return values. Free with g_variant_unref().

The caller of the method takes ownership of the data, and is responsible for freeing it.