Trying to understand hooks?

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Im trying to understand the process of hooking. Now I have found a piece of code which was from a key logger found on A1VBCode an open source site for educational purposes, and keep in mind I have no concern for malicious activity but I noticed this guy is using hooks to hook the keys on the keyboard. These are a few of his hooks:

K_Return = &HD
K_Backspace = &H8
K_Space = &H20
K_Tab = &H9
K_Esc = &H1B
K_Control = &H11
K_LControl = &HA2
K_RControl = &HA3
K_Delete = &H2E
K_End = &H23
K_Home = &H24
K_Insert = &H2D

These hook codes aren't found on any tables I have tried searching for, like ASCII tables I dont even know if im looking in the right area. I also noticed from the code project here: API hooking revealed[^] where they explain it. What is the purpose of hooking and where can I find codes that represent each key on a board or for the mouse clicks etc?

Posted 11-Apr-11 8:27am

Herboren

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Henry Minute · Accepted Answer · 2011-04-11T09:29:00

Solution 1

According to this ASCII chart[^] (and all others, so far as I know):

The decimal value for the keycode of the Return key is 13, or in hexadecimal D (&HD)
The decimal value for the keycode of the Backspace key is 8, or in hexadecimal 8 (&H8)
The decimal value for the keycode of the Space key is 32, or in hexadecimal 20 (&H20)

Need I continue?

Posted 11-Apr-11 9:29am

Henry Minute

v2

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Herboren 11-Apr-11 18:57pm

So the hex value is used, I just figured it was a custom var created by the user, mmkay I see now.