Class TasksService

Whenever the source_property is changed the target_property is updated using the same value. For instance:

  g_object_bind_property (action, "active", widget, "sensitive", 0);

Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.

If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual: if target_property on target changes then the source_property on source will be updated as well.

The binding will automatically be removed when either the source or the target instances are finalized. To remove the binding without affecting the source and the target you can just call g_object_unref() on the returned #GBinding instance.

Removing the binding by calling g_object_unref() on it must only be done if the binding, source and target are only used from a single thread and it is clear that both source and target outlive the binding. Especially it is not safe to rely on this if the binding, source or target can be finalized from different threads. Keep another reference to the binding and use g_binding_unbind() instead to be on the safe side.

A #GObject can have multiple bindings.

This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.

If cancellable is not %NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled before or during network activity, the error %G_IO_ERROR_CANCELLED will be returned. Cancellation has no effect after network activity has finished, however, and the deletion will return successfully (or return an error sent by the server) if it is first cancelled after network activity has finished. See the overview of cancellation for more details.

If there is an error deleting the entry, a %GDATA_SERVICE_ERROR_PROTOCOL_ERROR error will be returned. Currently, subclasses cannot cannot override this or provide more specific errors.

For more details, see gdata_service_delete_entry(), which is the synchronous version of this function.

When the operation is finished, callback will be called. You can then call gdata_service_delete_entry_finish() to get the results of the operation.

This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.

The value can be:

• an empty #GValue initialized by %G_VALUE_INIT, which will be automatically initialized with the expected type of the property (since GLib 2.60)
• a #GValue initialized with the expected type of the property
• a #GValue initialized with a type to which the expected type of the property can be transformed

In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().

Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.

The service will return an updated version of the entry, which is the return value of this function on success.

If cancellable is not %NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled before or during network activity, the error %G_IO_ERROR_CANCELLED will be returned. Cancellation has no effect after network activity has finished, however, and the insertion will return successfully (or return an error sent by the server) if it is first cancelled after network activity has finished. See the overview of cancellation for more details.

If the entry is marked as already having been inserted a %GDATA_SERVICE_ERROR_ENTRY_ALREADY_INSERTED error will be returned immediately (there will be no network requests).

If there is an error inserting the entry, a %GDATA_SERVICE_ERROR_PROTOCOL_ERROR error will be returned. Currently, subclasses cannot cannot override this or provide more specific errors.

For more details, see gdata_service_insert_entry(), which is the synchronous version of this function.

When the operation is finished, callback will be called. You can then call gdata_service_insert_entry_finish() to get the results of the operation.

This is basically a convenience method for checking that the service's #GDataAuthorizer is authorized for all the service's #GDataAuthorizationDomains.

When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.

Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.

This function omits the property name lookup, hence it is faster than g_object_notify().

One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:

  enum
  {
    PROP_0,
    PROP_FOO,
    PROP_LAST
  };

  static GParamSpec *properties[PROP_LAST];

  static void
  my_object_class_init (MyObjectClass *klass)
  {
    properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
                                             0, 100,
                                             50,
                                             G_PARAM_READWRITE);
    g_object_class_install_property (gobject_class,
                                     PROP_FOO,
                                     properties[PROP_FOO]);
  }

and then notify a change on the "foo" property with:

  g_object_notify_by_pspec (self, properties[PROP_FOO]);

If cancellable is not %NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled before or during network activity, the error %G_IO_ERROR_CANCELLED will be returned. Cancellation has no effect after network activity has finished, however, and the query will return successfully (or return an error sent by the server) if it is first cancelled after network activity has finished. See the overview of cancellation for more details.

A %GDATA_SERVICE_ERROR_PROTOCOL_ERROR will be returned if the server indicates there is a problem with the query, but subclasses may override this and return their own errors. See their documentation for more details.

For each entry in the response feed, progress_callback will be called in the main thread. If there was an error parsing the XML response, a #GDataParserError will be returned.

If the query is successful and the feed supports pagination, query will be updated with the pagination URIs, and the next or previous page can then be loaded by calling gdata_query_next_page() or gdata_query_previous_page() before running the query again.

If the #GDataQuery's ETag is set and it finds a match on the server, %NULL will be returned, but error will remain unset. Otherwise, query's ETag will be updated with the ETag from the returned feed, if available.

For more details, see gdata_service_query(), which is the synchronous version of this function.

When the operation is finished, callback will be called. You can then call gdata_service_query_finish() to get the results of the operation.

Parameters and errors are as for gdata_service_query(). Most of the properties of query aren't relevant, and will cause a server-side error if used. The most useful property to use is #GDataQuery:etag, which will cause the server to not return anything if the entry hasn't been modified since it was given the specified ETag; thus saving bandwidth. If the server does not return anything for this reason, gdata_service_query_single_entry() will return %NULL, but will not set an error in error.

For more details, see gdata_service_query_single_entry(), which is the synchronous version of this function.

When the operation is finished, callback will be called. You can then call gdata_service_query_single_entry_finish() to get the results of the operation.

Since GLib 2.56, if GLIB_VERSION_MAX_ALLOWED is 2.56 or greater, the type of object will be propagated to the return type (using the GCC typeof() extension), so any casting the caller needs to do on the return type must be explicit.

In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.

Since GLib 2.56, the type of object will be propagated to the return type under the same conditions as for g_object_ref().

This function should only be called from object system implementations.

If the object already had an association with that name, the old association will be destroyed.

Internally, the key is converted to a #GQuark using g_quark_from_string(). This means a copy of key is kept permanently (even after object has been finalized) — so it is recommended to only use a small, bounded set of values for key in your program, to avoid the #GQuark storage growing unbounded.

Note that while it's possible to change the locale after sending network requests, it is unsupported, as the server-side software may behave unexpectedly. The only supported use of this function is after creation of a service, but before any network requests are made.

If timeout is 0, network operations will never time out.

Note that if a #GDataAuthorizer is being used with this #GDataService, the authorizer might also need its timeout setting.

void
object_add_to_user_list (GObject     *object,
                         const gchar *new_string)
{
  // the quark, naming the object data
  GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
  // retrieve the old string list
  GList *list = g_object_steal_qdata (object, quark_string_list);

  // prepend new string
  list = g_list_prepend (list, g_strdup (new_string));
  // this changed 'list', so we need to set it again
  g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
}
static void
free_string_list (gpointer data)
{
  GList *node, *list = data;

  for (node = list; node; node = node->next)
    g_free (node->data);
  g_list_free (list);
}

Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata() would have left the destroy function set, and thus the partial string list would have been freed upon g_object_set_qdata_full().

Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.

It is an error to call this function when the freeze count is zero.

If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.

The service will return an updated version of the entry, which is the return value of this function on success.

If cancellable is not %NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled before or during network activity, the error %G_IO_ERROR_CANCELLED will be returned. Cancellation has no effect after network activity has finished, however, and the update will return successfully (or return an error sent by the server) if it is first cancelled after network activity has finished. See the overview of cancellation for more details.

If there is an error updating the entry, a %GDATA_SERVICE_ERROR_PROTOCOL_ERROR error will be returned. Currently, subclasses cannot cannot override this or provide more specific errors.

For more details, see gdata_service_update_entry(), which is the synchronous version of this function.

When the operation is finished, callback will be called. You can then call gdata_service_update_entry_finish() to get the results of the operation.

When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.

Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.