Code for KeyboardHooking in Pocket PC 2003

[sachinm]

COPY IT... and open with notepad...
I am sending .cpp file and .h file. But I included this cpp file in my application cpp file and this .h file in my application .h file....
Please note this...


//////////////////////////// .CPP file ///////////////////////////////////
#include "stdafx.h"
#include "winceKBhook.h"

//globals
HINSTANCE g_hHookApiDLL = NULL; //handle to coredll.dll, where all the hook related APIs are present
HHOOK g_hInstalledLLKBDhook = NULL; //g_hInstalledLLKBDhook represents handle to the installed KB hook



//WINCEKBHOOK_API BOOL ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction)
BOOL ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction)
{
//we need to manually load these standard Win32 API calls
//MSDN states that these aren't supported in WinCE
SetWindowsHookEx = NULL;
CallNextHookEx = NULL;
UnhookWindowsHookEx = NULL;

//now load the coredll.dll
g_hHookApiDLL = LoadLibrary(_T("coredll.dll"));
if(g_hHookApiDLL == NULL)
{
//something is awfully wrong
//the dll has to be present
return false;
}
else
{
//load the SetWindowsHookEx API call
//the SetWindowsHookEx function installs an application-defined hook procedure into a hook chain.
//You would install a hook procedure to monitor the system for certain types of events.
//here we use use the hook to monitor kyeboard events
SetWindowsHookEx = (_SetWindowsHookExW)GetProcAddress(g_hHookApiDLL, _T("SetWindowsHookExW"));
if(SetWindowsHookEx == NULL)
{
//this means that MS has really stopped supporting this API in WinCE
return false;
}
else
{
//install the KB hook
//the hande needs to be saved for default processing of the events and to uninstall the hook, once we are done with it
g_hInstalledLLKBDhook = SetWindowsHookEx(WH_KEYBOARD_LL, LLKeyboardHookCallbackFunction, hInstance, 0);
if(g_hInstalledLLKBDhook == NULL)
{
return false;
}
}

//load CallNextHookEx() API call
//the CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain.
//we use this call for default processing of events.
CallNextHookEx = (_CallNextHookEx)GetProcAddress(g_hHookApiDLL, _T("CallNextHookEx"));
if(CallNextHookEx == NULL)
{
return false;
}

//load UnhookWindowsHookEx() API
//the UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.
//we use this call to unistall the hook.
UnhookWindowsHookEx = (_UnhookWindowsHookEx)GetProcAddress(g_hHookApiDLL, _T("UnhookWindowsHookEx"));
if(UnhookWindowsHookEx == NULL)
{
return false;
}
}

//all the APIs are loaded and the application is hooked
return true;
}



//WINCEKBHOOK_API BOOL DeactivateKBHook()
BOOL DeactivateKBHook()
{
//unload the hook
if(g_hInstalledLLKBDhook != NULL)
{
UnhookWindowsHookEx(g_hInstalledLLKBDhook);
g_hInstalledLLKBDhook = NULL;
}

//unload the coredll.dll
if(g_hHookApiDLL != NULL)
{
FreeLibrary(g_hHookApiDLL);
g_hHookApiDLL = NULL;
}

//we have terminated gracefully
return true;
}


////////////////////////////// end of cpp file ///////////////////////////////////


////////////////////////////////////// .h file ///////////////////////////////

#ifndef _WINCE_KB_HOOK_H
#define _WINCE_KB_HOOK_H

//used for passing to SetWindowsHookEx funtion to set a Low level (LL) keyboard hook
#define WH_KEYBOARD_LL 20

// Define the function types used by hooks
typedef LRESULT (CALLBACK* HOOKPROC)(int code, WPARAM wParam, LPARAM lParam);
typedef HHOOK (WINAPI *_SetWindowsHookExW)(int, HOOKPROC, HINSTANCE, DWORD);
typedef LRESULT (WINAPI *_CallNextHookEx)(HHOOK, int, WPARAM, LPARAM);
typedef LRESULT (WINAPI *_UnhookWindowsHookEx)(HHOOK);


// For the low level keyboard hook, your keyboards procedures is passed a pointer to KBDLLHOOKSTRUCT instance
typedef struct {
DWORD vkCode;
DWORD scanCode;
DWORD flags;
DWORD time;
ULONG_PTR dwExtraInfo;
} KBDLLHOOKSTRUCT, *PKBDLLHOOKSTRUCT;


// Win32 Hook APIs
static _SetWindowsHookExW SetWindowsHookEx;
static _UnhookWindowsHookEx UnhookWindowsHookEx;
static _CallNextHookEx CallNextHookEx;


//WINCEKBHOOK_API BOOL ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction);


BOOL ActivateKBHook(HINSTANCE hInstance, HOOKPROC LLKeyboardHookCallbackFunction);


//WINCEKBHOOK_API BOOL DeactivateKBHook();


BOOL DeactivateKBHook();



#endif

////////////////////////////////////// end of .h file //////////////////////////////
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