EventGhost/EventGhost

// hook.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "hook.h"

#pragma data_seg(".shared")
static HWND g_egMessageHwnd = 0;
static HHOOK cbtHookHandle = NULL;
static HHOOK shellHookHandle = NULL;
static HINSTANCE hinstDLL; 
#pragma data_seg()
#pragma comment(linker, "/SECTION:.shared,RWS")


LRESULT CALLBACK CbtHook(int nCode, WPARAM wParam, LPARAM lParam) 
{
    switch (nCode)
    {
        case HCBT_SETFOCUS:
            PostMessage(g_egMessageHwnd, WM_APP+1, wParam, lParam);
            break;
        //case HCBT_CREATEWND:
        //    PostMessage(g_egMessageHwnd, WM_APP+2, wParam, lParam);
        //    break;
        //case HCBT_DESTROYWND:
        //    PostMessage(g_egMessageHwnd, WM_APP+3, wParam, lParam);
        //    break;
    }
    return CallNextHookEx(cbtHookHandle, nCode, wParam, lParam);
}


LRESULT CALLBACK ShellHook(int nCode, WPARAM wParam, LPARAM lParam) 
{
    switch (nCode)
    {
        case HSHELL_WINDOWCREATED:
            PostMessage(g_egMessageHwnd, WM_APP+2, wParam, lParam);
            break;
        case HSHELL_WINDOWDESTROYED:
            PostMessage(g_egMessageHwnd, WM_APP+3, wParam, lParam);
            break;
    }
    return CallNextHookEx(shellHookHandle, nCode, wParam, lParam);
}


void StartHook()
{
    g_egMessageHwnd = FindWindow("HiddenMessageReceiver", "EventGhost Message Receiver");
    cbtHookHandle = SetWindowsHookEx(WH_CBT, CbtHook, hinstDLL, 0);
    shellHookHandle = SetWindowsHookEx(WH_SHELL, ShellHook, hinstDLL, 0);
}


void StopHook()
{
    UnhookWindowsHookEx(cbtHookHandle);
    cbtHookHandle = NULL;
    UnhookWindowsHookEx(shellHookHandle);
    shellHookHandle = NULL;
}


BOOL APIENTRY DllMain( HINSTANCE hinst,
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
        case DLL_PROCESS_ATTACH:
            hinstDLL = hinst;
            DisableThreadLibraryCalls(hinst);
            break;
        case DLL_PROCESS_DETACH:
            break;
    }
    return TRUE;
}