hooking dll so far

// dllmain.cpp : Defines the entry point for the DLL application.
#pragma once
#include "stdafx.h"
#include <iostream>
using namespace std;

 HINSTANCE currentProcessHandle;
 HOOKPROC hkprcSysMsg;
 HHOOK hookID;

BOOL APIENTRY DllMain( HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        currentProcessHandle = hModule;
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

LRESULT CALLBACK HookProcedure(int nCode, WPARAM wparam, LPARAM lparam)
{
    if (nCode >= 0)
    {
        switch (nCode)
        {
        case HCBT_CREATEWND:
            cout << "Created!~" << endl;
            break;
        case HCBT_DESTROYWND:
            cout << "Destroied!~" << endl;
            break;
        default:
            cout << "sth else" << endl;
            break;
        }
    }
    else
    {
        return CallNextHookEx(hookID, nCode, wparam, lparam);
    }
}

void InstallHook()
{
    hookID = SetWindowsHookEx(WH_CBT, HookProcedure, currentProcessHandle, 0);
}

void UnistallHook()
{
    UnhookWindowsHookEx(hookID);
}