LiveCode Forums.

Hey all,

rawKeyDown does not seem to capture the PrtScn key (65377) but rawKeyUp does.

Is this intentional or a bug?

sounds like a bug to me.

Thanks!
E-mailed support.

Not a bug. Windows doesn't send rawKeyDown for several key presses, and Print Screen is one of them.

Still a bug, because if that is true, livecode should circumvent that by supplying it's own.

I don't think it can. If the OS doesn't tell LiveCode there's been a keypress, it can't know the key went down. LiveCode doesn't monitor the keyboard directly, it relies on the OS to notify it.

...and it's not just Windows, much as I'd like to blame them for this. Same thing on linux - there are certain keypresses that the OS intercepts before any application gets to them. The OS uses them and in certain cases doesn't pass them on. There are sneaky ways to get into the OS message loop, and there are utilities that do this: fancy things with screen printing, for example, but they're very special purpose things and no general-purpose IDEs - they have to get their hooks deep into the OS in order to get there before the OS grabs the keystrokes.

mwieder wrote:...and it's not just Windows

OS X too -- like all the Command key shortcuts that manage window switching, Spaces, app switching, etc. It's impossible to intercept anything that OS X has decided "belongs" to it. And unfortunately they've usurped almost all the keyboard characters now, so there are very few command key combinations left for our apps to use.

Grumble.