Global Hook to detect keypresses?

Lol well in a nutshell, a hook is a way for a function you write to 'intercept' a windows message/event that happens and process it before it gets to the window it's trying to get to. This way your hook callback function, which gets called by windows, can then process the command and do something with it, and in some cases even prevent the original target window from receiving it, or change the message before it reaches the target window.

For instance a Keypress normally works like this:

User presses Key-->OS Reacts--->Sends KeyPress Event-->Active Window-->Application processes keypress and does what it needs to.

If you 'register' a hook (by calling setwindowshookex) which basically tells windows "hey when this or that happens, call my function first", you get something like this:

User does KeyPress->OS-->Sends KeyPress Event--->HOOK CALLBACK gets called->You do whatever you want with it, for instance save to a file-->Message continues on to Active Window as if nothing happened etc.

That's the basics of a keylogger right there

Same thing with D3D hacks etc. they intercept the drawing events and change a few things around to give the user an advantage

Hey that makes beautiful sense! Now here is for something that i was actually confused about and not just ignorant =). Callbacks. I can't seem to find ANY explanations for/about them.

Hmm i'm gonna offer my guess as to what they are. Are they functions that you can set up so that when something happens, the callback function gets called, sort of like an event (don't remember which language this term is from)? I'm probably wrong though. =)

Can you explain what your problem is with GetAsyncKeyState? I don't see why you would want to get more complicated in regards to that.

That's basically it

GetAsyncKeyState ONLY affects that window. I'm making something where you can press the key anywhere you want and make a function happen, meaning GetAsyncKeyState wouldn't work.

GetAsyncKeystate works fine outside the window o__O

Yes it does, and on the contrary I would be looking for something that would affect ONLY the window. Don't know why you are looking for something to affect all windows.

only 'bad' thing about getasynckeystate is that if another app calls it before your app you won't see it.

Ehh, I'm still having a ton of trouble using hooks.

What part are you sitll having issues with?

I can't figure out how to parse the keys the hook returns.

Depending on whether or not you're using WH_KEYBOARD or WH_KEYBOARD_LL it's different.

if you using WH_KEYBOARD then the wparam in your callback will hold the virtual keycode whicih you can then compare to what you're looking for

If you're using WH_KEYBOARD_LL then lparam will hold a KBDLLHOOKSTRUCT in which has a vkcode member you can check against

I can probably write you up a working sample if need be?