dll low level HOOK

#ifndef _DLL_HOOKER
#define _DLL_HOOKER


#include<Windows.h>

static HHOOK hHook;

typedef void (*FuncHandle)(int,int);

static FuncHandle Handler = NULL;

LRESULT CALLBACK HookProc(int nCode, WPARAM wParam, LPARAM lParam);

BOOL APIENTRY DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
    switch (dwReason)
    {
        case DLL_PROCESS_ATTACH:
            DisableThreadLibraryCalls(hInstance);
            hHook = SetWindowsHookEx(WH_KEYBOARD_LL, HookProc, hInstance, NULL);
        break;

        case DLL_PROCESS_DETACH:
            UnhookWindowsHookEx(hHook);
        break;
    }
    return true;
}

LRESULT CALLBACK HookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    if (nCode >= 0 && LOWORD(wParam) == WM_KEYDOWN)
    {
        if(Handler)
        {
            KBDLLHOOKSTRUCT St = *(KBDLLHOOKSTRUCT *)lParam;
            (*Handler)(St.vkCode, St.flags);
        }
    }
    return CallNextHookEx(NULL, nCode, wParam, lParam);
}

extern "C" __declspec(dllexport) void CALLBACK SetHandler(FuncHandle handlerfunc)
{
    Handler = handlerfunc;
}

#endif