alias Gio::DBusMessageFilterFunction
Overview
Signature for function used in g_dbus_connection_add_filter().
A filter function is passed a #GDBusMessage and expected to return
a #GDBusMessage too. Passive filter functions that don't modify the
message can simply return the @message object:
|[
static GDBusMessage *
passive_filter (GDBusConnection *connection
GDBusMessage *message,
gboolean incoming,
gpointer user_data)
{
// inspect @message
return message;
}
]|
Filter functions that wants to drop a message can simply return nil:
|[
static GDBusMessage *
drop_filter (GDBusConnection *connection
GDBusMessage *message,
gboolean incoming,
gpointer user_data)
{
if (should_drop_message)
{
g_object_unref (message);
message = NULL;
}
return message;
}
]|
Finally, a filter function may modify a message by copying it:
|[
static GDBusMessage *
modifying_filter (GDBusConnection *connection
GDBusMessage *message,
gboolean incoming,
gpointer user_data)
{
GDBusMessage *copy;
GError *error;
error = NULL; copy = g_dbus_message_copy (message, &error); // handle @error being set g_object_unref (message);
// modify @copy
return copy; } ]| If the returned #GDBusMessage is different from @message and cannot be sent on @connection (it could use features, such as file descriptors, not compatible with @connection), then a warning is logged to standard error. Applications can check this ahead of time using g_dbus_message_to_blob() passing a #GDBusCapabilityFlags value obtained from @connection.
Alias Definition
Gio::DBusConnection, Gio::DBusMessage, Bool -> Gio::DBusMessage