Get Keyboard scan code from a console app

[dedndave]

it's essentially the same code, just written in a different style

[pcMike]

Hi Dave,

I found a little bug in the AnyKey procedure. If the user presses Ctrl-C, it will shut down my application.
Is there any way to prevent this from happening? Otherwise I may end up needing to create a scan table
and stick with GetKey. :-(

Mike

[dedndave]

i have noticed some "peculiarities" in the routine, also
for example, when pressing keys like shift, control, alt, the routine exits with a keystroke
it is somewhat debatable if that is desirable - lol
and - another debate for caps lock, scroll lock, num lock, etc
these issues can be handled by simply adding filters to the code, and looping back
let me know if you want an example of how to do this

as for the specific problem of Ctrl-C - it's not really a bug - it's considered normal   
you could use SetConsoleCtrlHandler during program initialization to alter this behaviour
however, i don't think you can avoid the Ctrl-Break combination

http://msdn.microsoft.com/en-us/library/windows/desktop/ms686016%28v=vs.85%29.aspx

Code Select Expand

    INVOKE  SetConsoleCtrlHandler,NULL,TRUE

[dedndave]

ok - i was wrong..... again   

you can capture Ctrl-Break by writing a handler routine

in the attached test program, i wrote a simple handler that intercepts both Ctrl-C and Ctrl-Break
i also added filters to AnyKey so that it does not exit for shift, control, or alt keys

now, the problem is that no keystroke is generated for Ctrl-C
i may be able to insert that stroke into the stream manually
let me try it on the next go

note: there are numerous Ctrl-? strokes that do not place anything into the stream (Ctrl-S, for example)

[pcMike]

Thanks Dave that did the trick for Ctrl-C. I'm not too concerned about Ctrl-Break as that seems to kill most Console programs, so I can live with that. I did have to add filters to ignore the plain ALT, CTL and SHIFT key results... but since it's named AnyKey it lives up to it's name. :)

Mike

[dedndave]

yah - my initial use for this routine was simply "wait for any key to be pressed"
i decided to add the extra functionality because the info was there   :P

[pcMike]

Your new test version works very well so far.  I don't need to test for Ctrl-C in my app so I may use this version instead. :-)

Mike

[dedndave]

ok - well, if you need to, you can use WriteConsoleInput to insert INPUT_RECORD structures into the stream
for each keypress, you would want a record for key down and a record for key up