C-implemented keyboard hook

/*
* File name: keyboardhook. c
* Purpose: keyboard hook demo
* Programming environment: WINXP SP2 + Cl 8.0
* Completion date: 2006.3 ver 0.01
* Authors: 88250
* Contact: E-mail: DL88250@gmail.com QQ: 845765
*/

# DEFINE _ win32_winnt 0x0400

# Include <stdio. h>

# Include <stdlib. h>

# Include <windows. h>

# Pragma comment (Lib, "user32.lib ")

DWORD g_tid = 0;

Hhook g_hook = 0;

Bool callback con_handler (DWORD g_tid)

{

Postthreadmessage (g_tid, wm_quit, 0, 0 );

Return true;

}

Lresult callback kb_proc (INT code, wparam W, lparam L)

{

Pkbdllhookstruct P = (pkbdllhookstruct) L;

If (W = wm_keydown) & (getkeystate (vk_capital) & 1) | (getkeystate (vk_shift) & 1 )))

& (P-> vkcode> 64) & (p-> vkcode <91) | (P-> vkcode> 47) & (p-> vkcode <58 )))){

Printf ("You press % C", p-> vkcode );

} Else if (W = wm_keydown) & (P-> vkcode> 64) & (p-> vkcode <91 ))){

Printf ("You press % C", p-> vkcode + 32 );

} Else if (W = wm_keydown) & (P-> vkcode> 47) & (p-> vkcode <58 ))){

Printf ("You press % C", p-> vkcode );

}

Return callnexthookex (g_hook, code, W, L );

}

Int main (void)

{

MSG;

G_tid = getcurrentthreadid ();

Setconsolectrlhandler (& con_handler, true );

G_hook = setwindowshookex (wh_keyboard_ll, & kb_proc, getmodulehandle (null), 0 );

While (getmessage (& MSG, null, 0, 0 )){

Translatemessage (& MSG );

Dispatchmessage (& MSG );

}

Unhookwindowshookex (g_hook );

Return 0;

}