How to organize inter-thread communication in winforms?

Question

C++ / C#

There are two threads, one of them inverts the image, the other should display the process of inverting itself using a progress bar. The question is how to transfer information from the stream that inverts the picture to the stream that displays the process.

Answer 1

The hard way: take a ConcurrentQueue , write a small message class, pass progress messages from a worker thread to a GUI thread (in a GUI thread, you check the message queue on a timer).
Another option, simpler, is to wrap the workflow in a converter class, make this class have a ProgressChanged event, pull the event using Invoke.
In general, there is a BackgroundWorker for this purpose - this is the easiest option, just right for you.
PS do not forget to use LockBits, otherwise it will work slowly.

Answer 2

IProgress, BackgroundWorker