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#include <giomm.h>
#include <iostream>
#include <typeinfo>
void
on_read_async(const Glib::RefPtr<Gio::AsyncResult>& result)
{
if (!result)
{
std::cerr << G_STRFUNC << ": result is empty." << std::endl;
exit(EXIT_FAILURE);
}
auto cobj = g_async_result_get_source_object(result->gobj());
if (!cobj)
{
std::cerr << G_STRFUNC << ": g_async_result_get_source_object() failed." << std::endl;
exit(EXIT_FAILURE);
}
// Show why Glib::wrap(cobj) can't be used in Gio::AsyncResult::get_source_object_base().
// cppobjbase is not a Glib::Object*, it's a Gio::File* which is a Glib::Interface*.
std::cout << "GType name: " << G_OBJECT_TYPE_NAME(cobj) << std::endl;
auto cppobjbase = Glib::wrap_auto(cobj); // Glib::ObjectBase::_get_current_wrapper(cobj);
if (cppobjbase)
{
std::cout << "C++ type name: " << typeid(*cppobjbase).name() << std::endl;
auto cppobj = dynamic_cast<Glib::Object*>(cppobjbase); // Part of Glib::wrap(GObject*, bool)
auto cppiface = dynamic_cast<Glib::Interface*>(cppobjbase);
std::cout << "dynamic_cast<Glib::Object*>: " << cppobj << std::endl;
std::cout << "dynamic_cast<Glib::Interface*>: " << cppiface << std::endl;
}
if (!result->get_source_object_base())
{
std::cerr << G_STRFUNC << ": result->get_source_object_base() failed." << std::endl;
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
int
main(int, char**)
{
Glib::init();
Gio::init();
auto mainloop = Glib::MainLoop::create();
auto file = Gio::File::create_for_path("/etc/passwd");
file->read_async(&on_read_async);
mainloop->run();
return EXIT_SUCCESS;
}
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