How to make to do (make a function/code) without using a thread or loop in C++

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I have hooking application that takes whatever data it shows on its edit box (XP system calculator). Hooking has gone well, except that I used thread to get the its edit box data. I am aware that there's a way to get it without using loops/thread but I just can't figure it out how. CALLBACKs???(I'm not sure) I tried using Window Messages like: WindowProc or PreTranslateMessage. But I can't Set or GetWindowText - I observed, maybe because, my components were manually created (hard coded), since when I use a dragged&dropped item, I can set/getWindowText (But I am contrained to use Hard Code). Anyway, all I just need to know from YOU is how to make that function/code that don't use common loops (for, while, etc) or threads. Please help.....thanks a lot.
Please provide sample code so that I'll grasp the concepts. Thanks.

Posted 25-Aug-10 21:13pm

this_is_my_alias

Updated 25-Aug-10 21:15pm

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Eugen Podsypalnikov 26-Aug-10 4:53am

I am not sure, there is a difference between "hooking" and "hacking" terms in you skills... :)
The hooking was provided to get some notifications (not to generate it) :)
See also: SetWindowsHookEx(..) description at MSDN.

this_is_my_alias 26-Aug-10 5:35am

Its hooking. And Yes, the purpose is to get notifications/intercept messages on some process. I don't get "not to generate it". But it's possible that you do more than getting messages like you can pass your own message to that hooked application (sending & receiving between processes).....

Eugen Podsypalnikov 26-Aug-10 6:28am

OK... Can you try to filter the calc's messages on WM_NOTIFY and analyze them in your hook procedure ? :)

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Christian Graus · Answer 1 · 2010-08-25T21:20:00

Solution 1

I have no idea what you're asking. Why not use a loop, if a look is what you need ? Do you mean you want to get the data from the textbox when it changes ? Can you subscribe to the text changed event for the textbox ? That's the only way to know when the text changed, otherwise, you need a loop or a timer or something to keep polling at random.

Posted 25-Aug-10 21:20pm

Christian Graus

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this_is_my_alias 26-Aug-10 3:39am

I'm constrained not to use threads/loops.
I am doing a hooking. I actually can GET the data from that edit box using [SendMessage(...)] but I can't use SetWindowText on my application because WindowProc won't allow me, it cause stack overflow/access denial. It won't allow me because I think its manually created and not through drag & drop. Anyway, I know its hard to figure things out just through texts. Thanks.