init

cmake/external/glib/cppgir/examples/gio-dbus-client.cpp

@@ -0,0 +1,63 @@
+#define GI_INLINE 1
+#include <gio/gio.hpp>
+
+#include <iostream>
+
+namespace GObject_ = gi::repository::GObject;
+namespace GLib = gi::repository::GLib;
+namespace Gio = gi::repository::Gio;
+
+static GLib::MainLoop loop;
+
+// many calls here support GError
+// so typically will throw here instead
+// (unless GError output is explicitly requested in call signature)
+
+// NOTE abundancy of gi::expect not generally needed;
+// only needed when using --dl and --expected
+
+static void
+on_reply(GObject_::Object ob, Gio::AsyncResult result)
+{
+  // if not caught here, it will be caught before returning to plain C
+#if GI_CONFIG_EXCEPTIONS
+  try {
+#endif
+    auto connection = gi::object_cast<Gio::DBusConnection>(ob);
+
+    auto call_result = gi::expect(connection.call_finish(result));
+    // get single array child
+    auto names = gi::expect(call_result.get_child_value(0));
+    int count = gi::expect(names.n_children());
+
+    std::cout << count << " message bus names: " << std::endl;
+    for (int i = 0; i < count; ++i)
+      std::cout << gi::expect(
+                       gi::expect(names.get_child_value(i)).get_string(nullptr))
+                << std::endl;
+#if GI_CONFIG_EXCEPTIONS
+  } catch (const GLib::Error &error) {
+    std::cerr << "error: '" << error.what() << "'." << std::endl;
+  }
+#endif
+
+  // quit when idle
+  GLib::idle_add([]() {
+    loop.quit();
+    return GLib::SOURCE_REMOVE_;
+  });
+}
+
+int
+main(int argc, char ** /*argv*/)
+{
+  auto bustype = argc <= 1 ? Gio::BusType::SESSION_ : Gio::BusType::SYSTEM_;
+  auto connection = gi::expect(Gio::bus_get_sync(bustype));
+
+  connection.call("org.freedesktop.DBus", "/org/freedesktop/DBus",
+      "org.freedesktop.DBus", "ListNames", nullptr, nullptr,
+      Gio::DBusCallFlags::NONE_, -1, nullptr, on_reply);
+
+  loop = gi::expect(GLib::MainLoop::new_());
+  loop.run();
+}