What is the best way to get multiple instances of a program to share information?

Question

There's information my program has to send from one part to another, such as from DragEnter to GiveFeedback to change the cursor. This is easily done with a variable as a flag. However – what if the user starts several instances of the program?

One way would be to write information to a file, but it seems best to do as little disk operations as possible. Another way would be to use pipes, but it seems a bit complicated if there are many instances of the program. Is there another way?

Answer 1

Take a look at memory mapped files .

A memory-mapped file contains the contents of a file in virtual memory. This mapping between a file and memory space enables an application, including multiple processes, to modify the file by reading and writing directly to the memory.

Answer 2

我将如何设置Model-View-Controller ……那是如果我正确理解了您的问题。