How can I detect if there is input waiting on stdin on windows?

Question

I want to detect whether or not there is input waiting on stdin in Windows.

I use the following generic structure on Linux:

fd_set currentSocketSet;         


        

Answer 1

As stated in the ReadConsoleInput() documentation:

A process can specify a console input buffer handle in one of the wait functions to determine when there is unread console input. When the input buffer is not empty, the state of a console input buffer handle is signaled.

To determine the number of unread input records in a console's input buffer, use the GetNumberOfConsoleInputEvents function. To read input records from a console input buffer without affecting the number of unread records, use the PeekConsoleInput function. To discard all unread records in a console's input buffer, use the FlushConsoleInputBuffer function.

You can use GetStdHandle() to get a handle to STDIN for use in the above functions.