Using BMessenger

A BMessenger represents and sends messages to a message target, where the target is a BLooper and, optionally, a specific BHandler within that looper. The target can live in the same application as the BMessenger (a local target), or it can live in some other application (a remote target).

BMessenger's most significant function is SendMessage(), which sends its argument BMessage to the target.

For a local target, SendMessage() is roughly equivalent, in terms of efficiency, to posting a message directly to the BMessenger's target (i.e BLooper::PostMessage()).

The global be_app_messenger BMessenger pointer, which targets be_app's main message loop, is automatically initialized for you when you create your BApplication object. You can use it wherever BMessengers are called for.