+ bool have_writer = true;
+ if (!_nanomsg.send(DISK_WRITER_PING "\n", 2000)) {
+ have_writer = false;
+ } else {
+ optional<string> reply = _nanomsg.receive (2000);
+ if (!reply || *reply != DISK_WRITER_PONG) {
+ have_writer = false;
+ }
+ }
+
+ if (!have_writer) {
+#ifdef DCPOMATIC_WINDOWS
+ MessageDialog* m = new MessageDialog (
+ this,
+ _("DCP-o-matic Disk Writer"),
+ _("Do you see a 'User Account Control' dialogue asking about dcpomatic2_disk_writer.exe? If so, click 'Yes', then try again.")
+ );
+ m->ShowModal ();
+ m->Destroy ();
+ return;
+#else
+ throw CommunicationFailedError ();
+#endif
+ }
+