How to hook EVENT_SYSTEM_FOREGROUND

PopupDemoApp.cpp

#include "pch.h"
#include "framework.h"
#include "PopupDemo.h"
#include "MyWnd.h"
#include "PopupDemoDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

BEGIN_MESSAGE_MAP(CPopupDemoApp, CWinApp)
	ON_COMMAND(ID_HELP, &CWinApp::OnHelp)
END_MESSAGE_MAP()

CPopupDemoApp::CPopupDemoApp()
{
}

CPopupDemoApp theApp;

static void eventProc(
	HWINEVENTHOOK hWinEventHook,
	DWORD event,
	HWND hwnd,
	LONG idObject,
	LONG idChild,
	DWORD idEventThread,
	DWORD dwmsEventTime
) {
	OutputDebugString(L"oops!");
}

BOOL CPopupDemoApp::InitInstance()
{
	CWinApp::InitInstance();
	SetRegistryKey(L"PopupDemo");
	SetWinEventHook(
		EVENT_SYSTEM_FOREGROUND,
		EVENT_SYSTEM_FOREGROUND,
		NULL,
		eventProc,
		0,
		0,
		WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);
	CPopupDemoDlg dlg;
	m_pMainWnd = &dlg;
	INT_PTR nResponse = dlg.DoModal();
	if (nResponse == IDOK)
	{
	}
	else if (nResponse == IDCANCEL)
	{
	}
	else if (nResponse == -1)
	{
	}
	return FALSE;
}

void CPopupDemoApp::ShowPopup()
{
	MyWnd* wnd = new MyWnd();
	if (!wnd->CreateMe())
		return;
	wnd->ShowWindow(SW_SHOW);
}