Now that we have established a channel for inter-thread communication, we have to decide how our two threads will communicate. In other words, what exactly will our uploader thread place on the queue, and how should our application thread respond to it? We could just throw anything into the queue and keep writing cases on the app-side to deal with whatever shows up, but a better approach is to create a mini-protocol that standardizes communications.
Our uploader thread will mainly be sending status-related information back to the application so that it can display updates about what's happening in message boxes or on the status bar. Let's create a message format that we can use to determine what the thread ...
