shutdown.c

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/*
 * COPYRIGHT:       See COPYING in the top level directory
 * PROJECT:         ReactOS msgina.dll
 * FILE:            lib/msgina/shutdown.c
 * PURPOSE:         Shutdown Dialog Box (GUI only)
 * PROGRAMMERS:     Lee Schroeder (spaceseel at gmail dot com)
 *                  Hermes Belusca-Maito (hermes.belusca@sfr.fr)
 *                  Arnav Bhatt (arnavbhatt288 at gmail dot com)
 */
 
#include "msgina.h"
#include <wingdi.h>
#include <windowsx.h>
#include <commctrl.h>
#include <ndk/pofuncs.h>
 
/* Macros for fancy shutdown dialog */
#define FONT_POINT_SIZE                 13
 
#define DARK_GREY_COLOR                 RGB(244, 244, 244)
#define LIGHT_GREY_COLOR                RGB(38, 38, 38)
 
/* Bitmap's size for buttons */
#define CX_BITMAP                       33
#define CY_BITMAP                       33
 
#define NUMBER_OF_BUTTONS               4
 
/* After determining the button as well as its state paint the image strip bitmap using these predefined positions */
#define BUTTON_SHUTDOWN                 0
#define BUTTON_SHUTDOWN_PRESSED         (CY_BITMAP + BUTTON_SHUTDOWN)
#define BUTTON_SHUTDOWN_FOCUSED         (CY_BITMAP + BUTTON_SHUTDOWN_PRESSED)
#define BUTTON_REBOOT                   (CY_BITMAP + BUTTON_SHUTDOWN_FOCUSED)
#define BUTTON_REBOOT_PRESSED           (CY_BITMAP + BUTTON_REBOOT)
#define BUTTON_REBOOT_FOCUSED           (CY_BITMAP + BUTTON_REBOOT_PRESSED)
#define BUTTON_SLEEP                    (CY_BITMAP + BUTTON_REBOOT_FOCUSED)
#define BUTTON_SLEEP_PRESSED            (CY_BITMAP + BUTTON_SLEEP)
#define BUTTON_SLEEP_FOCUSED            (CY_BITMAP + BUTTON_SLEEP_PRESSED)
#define BUTTON_SLEEP_DISABLED           (CY_BITMAP + BUTTON_SLEEP_FOCUSED)
 
/* For bIsButtonHot */
#define SHUTDOWN_BUTTON_HOT             0
#define REBOOT_BUTTON_HOT               1
#define SLEEP_BUTTON_HOT                2
#define HIBERNATE_BUTTON_HOT            3
 
typedef struct _SHUTDOWN_DLG_CONTEXT
{
    PGINA_CONTEXT pgContext;
    HBITMAP hBitmap;
    HBITMAP hImageStrip;
    DWORD ShutdownDialogId;
    DWORD ShutdownOptions;
    HBRUSH hBrush;
    HFONT hfFont;
    BOOL bCloseDlg;
    BOOL bIsSleepButtonReplaced;
    BOOL bReasonUI;
    BOOL bFriendlyUI;
    BOOL bIsButtonHot[NUMBER_OF_BUTTONS];
    BOOL bTimer;
    UINT_PTR iTimer;
    WNDPROC OldButtonProc;
} SHUTDOWN_DLG_CONTEXT, *PSHUTDOWN_DLG_CONTEXT;
 
 
LONG
GetPolicyDWORDValue(
    _In_opt_ HKEY hKeyCurrentUser,
    _In_ PCWSTR pPolicyKey,
    _In_ PCWSTR ValueName,
    _Out_ PDWORD pValue)
{
    HKEY hKey;
    DWORD dwValue;
    LONG rc;
 
    *pValue = 0;
 
    /* Query the policy value in HKEY_LOCAL_MACHINE */
    rc = RegOpenKeyExW(HKEY_LOCAL_MACHINE, pPolicyKey, 0,
                       KEY_QUERY_VALUE, &hKey);
    if (rc == ERROR_SUCCESS)
    {
        rc = ReadRegDwordValue(hKey, ValueName, &dwValue);
        RegCloseKey(hKey);
        if (rc == ERROR_SUCCESS)
        {
            *pValue = dwValue;
            return ERROR_SUCCESS;
        }
    }
 
    /* If not found, query the policy value in HKEY_CURRENT_USER */
    rc = RegOpenKeyExW(hKeyCurrentUser ? hKeyCurrentUser : HKEY_CURRENT_USER,
                       pPolicyKey, 0,
                       KEY_QUERY_VALUE, &hKey);
    if (rc == ERROR_SUCCESS)
    {
        rc = ReadRegDwordValue(hKey, ValueName, &dwValue);
        RegCloseKey(hKey);
        if (rc == ERROR_SUCCESS)
        {
            *pValue = dwValue;
            return ERROR_SUCCESS;
        }
    }
 
    return ERROR_NOT_FOUND;
}
 
 
static
BOOL
GetShutdownReasonUI(VOID)
{
    OSVERSIONINFOEX VersionInfo;
    DWORD dwValue, dwSize;
    HKEY hKey;
    LONG lRet;
 
    /* Query the policy value */
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"Software\\Policies\\Microsoft\\Windows NT\\Reliability",
                         0,
                         KEY_QUERY_VALUE,
                         &hKey);
    if (lRet == ERROR_SUCCESS)
    {
        dwValue = 0;
        dwSize = sizeof(dwValue);
        RegQueryValueExW(hKey,
                         L"ShutdownReasonUI",
                         NULL,
                         NULL,
                         (LPBYTE)&dwValue,
                         &dwSize);
        RegCloseKey(hKey);
 
        return (dwValue != 0) ? TRUE : FALSE;
    }
 
    /* Query the machine value */
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"Software\\Microsoft\\Windows\\CurrentVersion\\Reliability",
                         0,
                         KEY_QUERY_VALUE,
                         &hKey);
    if (lRet == ERROR_SUCCESS)
    {
        dwValue = 0;
        dwSize = sizeof(dwValue);
        RegQueryValueExW(hKey,
                         L"ShutdownReasonUI",
                         NULL,
                         NULL,
                         (LPBYTE)&dwValue,
                         &dwSize);
        RegCloseKey(hKey);
 
        return (dwValue != 0) ? TRUE : FALSE;
    }
 
    /* Return the default value */
    VersionInfo.dwOSVersionInfoSize = sizeof(VersionInfo);
    if (!GetVersionEx((POSVERSIONINFO)&VersionInfo))
        return FALSE;
 
    return FALSE;
//    return (VersionInfo.wProductType == VER_NT_WORKSTATION) ? FALSE : TRUE;
}
 
static
BOOL
IsFriendlyUIActive(VOID)
{
    DWORD dwType, dwValue, dwSize;
    HKEY hKey;
    LONG lRet;
 
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"SYSTEM\\CurrentControlSet\\Control\\Windows",
                         0,
                         KEY_QUERY_VALUE,
                         &hKey);
    if (lRet != ERROR_SUCCESS)
        return FALSE;
 
    /* CORE-17282 First check an optional ReactOS specific override, that Windows does not check.
       We use this to allow users pairing 'Server'-configuration with FriendlyShutdown.
       Otherwise users would have to change CSDVersion or LogonType (side-effects AppCompat) */
    dwValue = 0;
    dwSize = sizeof(dwValue);
    lRet = RegQueryValueExW(hKey,
                            L"EnforceFriendlyShutdown",
                            NULL,
                            &dwType,
                            (LPBYTE)&dwValue,
                            &dwSize);
 
    if (lRet == ERROR_SUCCESS && dwType == REG_DWORD && dwValue == 0x1)
    {
        RegCloseKey(hKey);
        return TRUE;
    }
 
    /* Check product version number */
    dwValue = 0;
    dwSize = sizeof(dwValue);
    lRet = RegQueryValueExW(hKey,
                            L"CSDVersion",
                            NULL,
                            &dwType,
                            (LPBYTE)&dwValue,
                            &dwSize);
    RegCloseKey(hKey);
 
    if (lRet != ERROR_SUCCESS || dwType != REG_DWORD || dwValue != 0x300)
    {
        /* Allow Friendly UI only on Workstation */
        return FALSE;
    }
 
    /* Check LogonType value */
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon",
                         0,
                         KEY_QUERY_VALUE,
                         &hKey);
    if (lRet != ERROR_SUCCESS)
        return FALSE;
 
    dwValue = 0;
    dwSize = sizeof(dwValue);
    lRet = RegQueryValueExW(hKey,
                            L"LogonType",
                            NULL,
                            &dwType,
                            (LPBYTE)&dwValue,
                            &dwSize);
    RegCloseKey(hKey);
 
    if (lRet != ERROR_SUCCESS || dwType != REG_DWORD)
        return FALSE;
 
    return (dwValue != 0);
}
 
static
BOOL
IsDomainMember(VOID)
{
    UNIMPLEMENTED;
    return FALSE;
}
 
static
BOOL
IsNetwareActive(VOID)
{
    UNIMPLEMENTED;
    return FALSE;
}
 
static
BOOL
IsShowHibernateButtonActive(VOID)
{
    INT_PTR lRet;
    HKEY hKey;
    DWORD dwValue, dwSize;
 
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"SOFTWARE\\Policies\\Microsoft\\Windows\\System\\Shutdown",
                         0, KEY_QUERY_VALUE, &hKey);
    if (lRet == ERROR_SUCCESS)
    {
        dwValue = 0;
        dwSize = sizeof(dwValue);
 
        lRet = RegQueryValueExW(hKey,
                                L"ShowHibernateButton",
                                NULL, NULL,
                                (LPBYTE)&dwValue, &dwSize);
        RegCloseKey(hKey);
        if (lRet != ERROR_SUCCESS)
        {
            return FALSE;
        }
        return (dwValue != 0);
    }
    return FALSE;
}
 
static
BOOL
ForceFriendlyUI(VOID)
{
    DWORD dwType, dwValue, dwSize;
    HKEY hKey;
    LONG lRet;
 
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System",
                         0,
                         KEY_QUERY_VALUE,
                         &hKey);
    if (lRet == ERROR_SUCCESS)
    {
        dwValue = 0;
        dwSize = sizeof(dwValue);
        lRet = RegQueryValueExW(hKey,
                                L"ForceFriendlyUI",
                                NULL,
                                &dwType,
                                (LPBYTE)&dwValue,
                                &dwSize);
        RegCloseKey(hKey);
 
        if (lRet == ERROR_SUCCESS && dwType == REG_DWORD)
            return (dwValue != 0);
    }
 
    lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                         L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon",
                         0,
                         KEY_QUERY_VALUE,
                         &hKey);
    if (lRet == ERROR_SUCCESS)
    {
        dwValue = 0;
        dwSize = sizeof(dwValue);
        lRet = RegQueryValueExW(hKey,
                                L"ForceFriendlyUI",
                                NULL,
                                &dwType,
                                (LPBYTE)&dwValue,
                                &dwSize);
 
        RegCloseKey(hKey);
 
        if (lRet == ERROR_SUCCESS && dwType == REG_DWORD)
            return (dwValue != 0);
    }
 
    return FALSE;
}
 
static
BOOL
DrawIconOnOwnerDrawnButtons(
    DRAWITEMSTRUCT* pdis,
    PSHUTDOWN_DLG_CONTEXT pContext)
{
    BOOL bRet;
    HDC hdcMem;
    HBITMAP hbmOld;
    int y;
    RECT rect;
 
    hdcMem = CreateCompatibleDC(pdis->hDC);
    hbmOld = SelectObject(hdcMem, pContext->hImageStrip);
    rect = pdis->rcItem;
 
    /* Check the button ID for relevant bitmap to be used */
    switch (pdis->CtlID)
    {
        case IDC_BUTTON_SHUTDOWN:
        {
            switch (pdis->itemAction)
            {
                case ODA_DRAWENTIRE:
                case ODA_FOCUS:
                case ODA_SELECT:
                {
                    y = BUTTON_SHUTDOWN;
                    if (pdis->itemState & ODS_SELECTED)
                    {
                        y = BUTTON_SHUTDOWN_PRESSED;
                    }
                    else if (pContext->bIsButtonHot[SHUTDOWN_BUTTON_HOT] || (pdis->itemState & ODS_FOCUS))
                    {
                        y = BUTTON_SHUTDOWN_FOCUSED;
                    }
                    break;
                }
            }
            break;
        }
 
        case IDC_BUTTON_REBOOT:
        {
            switch (pdis->itemAction)
            {
                case ODA_DRAWENTIRE:
                case ODA_FOCUS:
                case ODA_SELECT:
                {
                    y = BUTTON_REBOOT;
                    if (pdis->itemState & ODS_SELECTED)
                    {
                        y = BUTTON_REBOOT_PRESSED;
                    }
                    else if (pContext->bIsButtonHot[REBOOT_BUTTON_HOT] || (pdis->itemState & ODS_FOCUS))
                    {
                        y = BUTTON_REBOOT_FOCUSED;
                    }
                    break;
                }
            }
            break;
        }
 
        case IDC_BUTTON_HIBERNATE:
        case IDC_BUTTON_SLEEP:
        {
            switch (pdis->itemAction)
            {
                case ODA_DRAWENTIRE:
                case ODA_FOCUS:
                case ODA_SELECT:
                {
                    y = BUTTON_SLEEP;
                    if (pdis->itemState & ODS_DISABLED)
                    {
                        y = BUTTON_SLEEP_DISABLED;
                    }
                    else if (pdis->itemState & ODS_SELECTED)
                    {
                        y = BUTTON_SLEEP_PRESSED;
                    }
                    else if ((pdis->CtlID == IDC_BUTTON_SLEEP && pContext->bIsButtonHot[SLEEP_BUTTON_HOT]) ||
                             (pdis->CtlID == IDC_BUTTON_HIBERNATE && pContext->bIsButtonHot[HIBERNATE_BUTTON_HOT]) ||
                             (pdis->itemState & ODS_FOCUS))
                    {
                        y = BUTTON_SLEEP_FOCUSED;
                    }
                    break;
                }
            }
            break;
        }
    }
 
    /* Draw it on the required button */
    bRet = BitBlt(pdis->hDC,
                  (rect.right - rect.left - CX_BITMAP) / 2,
                  (rect.bottom - rect.top - CY_BITMAP) / 2,
                  CX_BITMAP, CY_BITMAP, hdcMem, 0, y, SRCCOPY);
 
    SelectObject(hdcMem, hbmOld);
    DeleteDC(hdcMem);
 
    return bRet;
}
 
BOOL
WINAPI
ShellIsFriendlyUIActive(VOID)
{
    BOOL bActive;
 
    bActive = IsFriendlyUIActive();
 
    if ((IsDomainMember() || IsNetwareActive()) && !ForceFriendlyUI())
        return FALSE;
 
    return bActive;
}
 
static INT_PTR
CALLBACK
OwnerDrawButtonSubclass(
    HWND hButton,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam)
{
    PSHUTDOWN_DLG_CONTEXT pContext;
    pContext = (PSHUTDOWN_DLG_CONTEXT)GetWindowLongPtrW(GetParent(hButton), GWLP_USERDATA);
    int buttonID = GetDlgCtrlID(hButton);
 
    switch (uMsg)
    {
        case WM_MOUSEMOVE:
        {
            HWND hwndTarget;
            POINT pt = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
 
            if (GetCapture() != hButton)
            {
                SetCapture(hButton);
                if (buttonID == IDC_BUTTON_SHUTDOWN)
                {
                    pContext->bIsButtonHot[SHUTDOWN_BUTTON_HOT] = TRUE;
                }
                else if (buttonID == IDC_BUTTON_REBOOT)
                {
                    pContext->bIsButtonHot[REBOOT_BUTTON_HOT] = TRUE;
                }
                else if (buttonID == IDC_BUTTON_SLEEP)
                {
                    pContext->bIsButtonHot[SLEEP_BUTTON_HOT] = TRUE;
                }
                else if (buttonID == IDC_BUTTON_HIBERNATE)
                {
                    pContext->bIsButtonHot[HIBERNATE_BUTTON_HOT] = TRUE;
                }
                SetCursor(LoadCursorW(NULL, IDC_HAND));
            }
 
            ClientToScreen(hButton, &pt);
            hwndTarget = WindowFromPoint(pt);
 
            if (hwndTarget != hButton)
            {
                ReleaseCapture();
                if (buttonID == IDC_BUTTON_SHUTDOWN)
                {
                    pContext->bIsButtonHot[SHUTDOWN_BUTTON_HOT] = FALSE;
                }
                else if (buttonID == IDC_BUTTON_REBOOT)
                {
                    pContext->bIsButtonHot[REBOOT_BUTTON_HOT] = FALSE;
                }
                else if (buttonID == IDC_BUTTON_SLEEP)
                {
                    pContext->bIsButtonHot[SLEEP_BUTTON_HOT] = FALSE;
                }
                else if (buttonID == IDC_BUTTON_HIBERNATE)
                {
                    pContext->bIsButtonHot[HIBERNATE_BUTTON_HOT] = FALSE;
                }
            }
            InvalidateRect(hButton, NULL, FALSE);
            break;
        }
 
        /* Whenever one of the buttons gets the keyboard focus, set it as default button */
        case WM_SETFOCUS:
        {
            SendMessageW(GetParent(hButton), DM_SETDEFID, buttonID, 0);
            break;
        }
 
        /* Otherwise, set IDCANCEL as default button */
        case WM_KILLFOCUS:
        {
            SendMessageW(GetParent(hButton), DM_SETDEFID, IDCANCEL, 0);
            break;
        }
    }
    return CallWindowProcW(pContext->OldButtonProc, hButton, uMsg, wParam, lParam);
}
 
VOID
CreateToolTipForButtons(
    int controlID,
    int detailID,
    HWND hDlg,
    int titleID,
    HINSTANCE hInst)
{
    HWND hwndTool, hwndTip;
    WCHAR szBuffer[256];
    TTTOOLINFOW tool;
 
    hwndTool = GetDlgItem(hDlg, controlID);
 
    tool.cbSize = sizeof(tool);
    tool.hwnd = hDlg;
    tool.uFlags = TTF_IDISHWND | TTF_SUBCLASS;
    tool.uId = (UINT_PTR)hwndTool;
 
    /* Create the tooltip */
    hwndTip = CreateWindowExW(0, TOOLTIPS_CLASSW, NULL,
                             WS_POPUP | TTS_ALWAYSTIP | TTS_BALLOON,
                             CW_USEDEFAULT, CW_USEDEFAULT,
                             CW_USEDEFAULT, CW_USEDEFAULT,
                             hDlg, NULL, hInst, NULL);
 
    /* Associate the tooltip with the tool */
    LoadStringW(hInst, detailID, szBuffer, _countof(szBuffer));
    tool.lpszText = szBuffer;
    SendMessageW(hwndTip, TTM_ADDTOOLW, 0, (LPARAM)&tool);
    LoadStringW(hInst, titleID, szBuffer, _countof(szBuffer));
    SendMessageW(hwndTip, TTM_SETTITLEW, TTI_NONE, (LPARAM)szBuffer);
    SendMessageW(hwndTip, TTM_SETMAXTIPWIDTH, 0, 250);
}
 
VOID
EndFriendlyDialog(
    HWND hDlg,
    PSHUTDOWN_DLG_CONTEXT pContext)
{
    if (pContext->bTimer)
    {
        KillTimer(hDlg, pContext->iTimer);
    }
 
    DeleteObject(pContext->hBitmap);
    DeleteObject(pContext->hBrush);
    DeleteObject(pContext->hImageStrip);
    DeleteObject(pContext->hfFont);
 
    /* Remove the subclass from the buttons */
    for (int i = 0; i < NUMBER_OF_BUTTONS; i++)
    {
        SetWindowLongPtrW(GetDlgItem(hDlg, IDC_BUTTON_SHUTDOWN + i),
                          GWLP_WNDPROC,
                          (LONG_PTR)pContext->OldButtonProc);
    }
}
 
VOID
ChangeRequiredButton(
    HWND hDlg,
    PSHUTDOWN_DLG_CONTEXT pContext)
{
    int destID = IDC_BUTTON_SLEEP;
    int targetedID = IDC_BUTTON_HIBERNATE;
    HWND hwndDest, hwndTarget;
    RECT rect;
    WCHAR szBuffer[30];
 
    /* If the sleep button has been already replaced earlier, bring sleep button back to its original position */
    if (pContext->bIsSleepButtonReplaced)
    {
        destID = IDC_BUTTON_HIBERNATE;
        targetedID = IDC_BUTTON_SLEEP;
    }
 
    hwndDest = GetDlgItem(hDlg, destID);
    hwndTarget = GetDlgItem(hDlg, targetedID);
 
    /* Get the position of the destination button */
    GetWindowRect(hwndDest, &rect);
 
    /* Get the corrected translated coordinates which is relative to the client window */
    MapWindowPoints(HWND_DESKTOP, hDlg, (LPPOINT)&rect, sizeof(RECT)/sizeof(POINT));
 
    /* Set the position of targeted button and hide the destination button */
    SetWindowPos(hwndTarget,
                 HWND_TOP,
                 rect.left, rect.top,
                 0, 0,
                 SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
 
    EnableWindow(hwndDest, FALSE);
    ShowWindow(hwndDest, SW_HIDE);
    EnableWindow(hwndTarget, TRUE);
    ShowWindow(hwndTarget, SW_SHOW);
    SetFocus(hwndTarget);
 
    if (!pContext->bIsSleepButtonReplaced)
    {
        LoadStringW(pContext->pgContext->hDllInstance, IDS_SHUTDOWN_HIBERNATE, szBuffer, _countof(szBuffer));
        SetDlgItemTextW(hDlg, IDC_SLEEP_STATIC, szBuffer);
    }
    else
    {
        LoadStringW(pContext->pgContext->hDllInstance, IDS_SHUTDOWN_SLEEP, szBuffer, _countof(szBuffer));
        SetDlgItemTextW(hDlg, IDC_SLEEP_STATIC, szBuffer);
    }
 
    InvalidateRect(hDlg, NULL, FALSE);
}
 
VOID OnTimer(
    HWND hDlg,
    PSHUTDOWN_DLG_CONTEXT pContext)
{
    BOOL ReplaceButton = !!(GetKeyState(VK_SHIFT) & 0x8000);
 
    if (ReplaceButton && !pContext->bIsSleepButtonReplaced)
    {
        ChangeRequiredButton(hDlg, pContext);
        pContext->bIsSleepButtonReplaced = TRUE;
    }
    else if (!ReplaceButton && pContext->bIsSleepButtonReplaced)
    {
        ChangeRequiredButton(hDlg, pContext);
        pContext->bIsSleepButtonReplaced = FALSE;
    }
}
 
DWORD
LoadShutdownSelState(
    _In_ HKEY hKeyCurrentUser)
{
    HKEY hKey;
    DWORD dwValue, dwTemp, dwSize;
    LONG lRet;
 
    /* Default to first item */
    dwValue = 0;
 
    /* Open the subkey */
    lRet = RegOpenKeyExW(hKeyCurrentUser,
                         L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer",
                         0, KEY_QUERY_VALUE, &hKey);
    if (lRet != ERROR_SUCCESS)
        return dwValue;
 
    /* Read the value */
    dwSize = sizeof(dwTemp);
    lRet = RegQueryValueExW(hKey,
                            L"Shutdown Setting",
                            NULL, NULL,
                            (LPBYTE)&dwTemp, &dwSize);
    RegCloseKey(hKey);
 
    if (lRet == ERROR_SUCCESS)
    {
        switch (dwTemp)
        {
            case WLX_SHUTDOWN_STATE_LOGOFF:
                dwValue = WLX_SAS_ACTION_LOGOFF;
                break;
 
            case WLX_SHUTDOWN_STATE_POWER_OFF:
                dwValue = WLX_SAS_ACTION_SHUTDOWN_POWER_OFF;
                break;
 
            case WLX_SHUTDOWN_STATE_REBOOT:
                dwValue = WLX_SAS_ACTION_SHUTDOWN_REBOOT;
                break;
 
            // 0x08
 
            case WLX_SHUTDOWN_STATE_SLEEP:
                dwValue = WLX_SAS_ACTION_SHUTDOWN_SLEEP;
                break;
 
            case WLX_SHUTDOWN_STATE_SLEEP2:
                dwValue = WLX_SAS_ACTION_SHUTDOWN_SLEEP2;
                break;
 
            case WLX_SHUTDOWN_STATE_HIBERNATE:
                dwValue = WLX_SAS_ACTION_SHUTDOWN_HIBERNATE;
                break;
 
            // WLX_SHUTDOWN_STATE_DISCONNECT
        }
    }
 
    return dwValue;
}
 
VOID
SaveShutdownSelState(
    _In_ HKEY hKeyCurrentUser,
    _In_ DWORD ShutdownCode)
{
    HKEY hKey;
    DWORD dwValue = 0;
    LONG lRet;
 
    /* Create the subkey */
    lRet = RegCreateKeyExW(hKeyCurrentUser,
                           L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer",
                           0, NULL,
                           REG_OPTION_NON_VOLATILE,
                           KEY_SET_VALUE,
                           NULL, &hKey, NULL);
    if (lRet != ERROR_SUCCESS)
        return;
 
    switch (ShutdownCode)
    {
        case WLX_SAS_ACTION_LOGOFF:
            dwValue = WLX_SHUTDOWN_STATE_LOGOFF;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_POWER_OFF:
            dwValue = WLX_SHUTDOWN_STATE_POWER_OFF;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_REBOOT:
            dwValue = WLX_SHUTDOWN_STATE_REBOOT;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_SLEEP:
            dwValue = WLX_SHUTDOWN_STATE_SLEEP;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_HIBERNATE:
            dwValue = WLX_SHUTDOWN_STATE_HIBERNATE;
            break;
    }
 
    RegSetValueExW(hKey,
                   L"Shutdown Setting",
                   0, REG_DWORD,
                   (LPBYTE)&dwValue, sizeof(dwValue));
    RegCloseKey(hKey);
}
 
DWORD
GetAllowedShutdownOptions(
    _In_opt_ HKEY hKeyCurrentUser,
    _In_opt_ HANDLE hUserToken)
{
    DWORD Options = 0;
    DWORD dwPolicyValue;
    SYSTEM_POWER_CAPABILITIES PowerCaps;
    NTSTATUS Status;
 
    dwPolicyValue = 0;
    GetPolicyDWORDValue(hKeyCurrentUser,
                        L"Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer",
                        L"NoLogoff", &dwPolicyValue);
    if (dwPolicyValue == 0)
        Options |= WLX_SHUTDOWN_STATE_LOGOFF;
 
#if 0 // TODO: Enable and lookup on a Terminal Services session
    dwPolicyValue = 0;
    GetPolicyDWORDValue(hKeyCurrentUser,
                        L"Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer",
                        L"NoDisconnect", &dwPolicyValue);
    if (dwPolicyValue == 0)
        Options |= WLX_SHUTDOWN_STATE_DISCONNECT;
#endif
 
    /* Add shutdown options only if the user has shutdown privilege */
    if (!TestTokenPrivilege(hUserToken, SE_SHUTDOWN_PRIVILEGE))
        return Options; // The user doesn't have them, bail out.
 
    /* We can always shutdown and restart */
    Options |= WLX_SHUTDOWN_STATE_POWER_OFF | WLX_SHUTDOWN_STATE_REBOOT;
 
    /* Determine whether extra power options are available */
    Status = NtPowerInformation(SystemPowerCapabilities, NULL, 0, &PowerCaps, sizeof(PowerCaps));
    if (!NT_SUCCESS(Status))
    {
        ERR("NtPowerInformation(SystemPowerCapabilities) failed (Status 0x%08lx)\n", Status);
    }
    else
    {
        if (IS_PWR_SUSPEND_ALLOWED(&PowerCaps))
            Options |= WLX_SHUTDOWN_STATE_SLEEP;
 
        // TODO: "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Power" value "Shutdown"
        // for sleep options. In particular, if set it tells that wakeup events can be disabled.
        // This will enable WLX_SHUTDOWN_STATE_SLEEP2 support.
 
        if (IS_PWR_HIBERNATE_ALLOWED(&PowerCaps))
            Options |= WLX_SHUTDOWN_STATE_HIBERNATE;
    }
 
    // TODO: Consider Windows 8+ support for:
    // "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Power" value "HiberbootEnabled"
 
    // TODO: Add WLX_SHUTDOWN_AUTOUPDATE if:
    // - Policy "Software\\Policies\\Microsoft\\Windows\\WindowsUpdate\\AU" value "NoAUShutdownOption"
    //   is absent or zero;
    // - SystemBatteryState detects the computer is on external power;
    // - wuaueng.dll!ordinal_4 tells there are pending updates.
 
    return Options;
}
 
static VOID
UpdateShutdownDesc(
    _In_ HWND hDlg,
    _In_ PSHUTDOWN_DLG_CONTEXT pContext) // HINSTANCE hInstance
{
    HWND hwndList = GetDlgItem(hDlg, IDC_SHUTDOWN_ACTION);
    DWORD ShutdownCode;
    UINT DescId = 0;
    WCHAR szBuffer[256];
 
    ShutdownCode = SendMessageW(hwndList, CB_GETCURSEL, 0, 0);
    if (ShutdownCode != CB_ERR)
        ShutdownCode = SendMessageW(hwndList, CB_GETITEMDATA, ShutdownCode, 0);
    if (ShutdownCode == CB_ERR) // Invalid selection
        return;
 
    switch (ShutdownCode)
    {
        case WLX_SAS_ACTION_LOGOFF:
            DescId = IDS_SHUTDOWN_LOGOFF_DESC;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_POWER_OFF:
            DescId = IDS_SHUTDOWN_SHUTDOWN_DESC;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_REBOOT:
            DescId = IDS_SHUTDOWN_RESTART_DESC;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_SLEEP:
            DescId = IDS_SHUTDOWN_SLEEP_DESC;
            break;
 
        case WLX_SAS_ACTION_SHUTDOWN_HIBERNATE:
            DescId = IDS_SHUTDOWN_HIBERNATE_DESC;
            break;
 
        default:
            break;
    }
 
    LoadStringW(pContext->pgContext->hDllInstance, DescId, szBuffer, _countof(szBuffer));
    SetDlgItemTextW(hDlg, IDC_SHUTDOWN_DESCRIPTION, szBuffer);
 
    if (pContext->bReasonUI)
    {
        BOOL bNotLogoff = (ShutdownCode != WLX_SAS_ACTION_LOGOFF);
        EnableWindow(GetDlgItem(hDlg, IDC_REASON_PLANNED), bNotLogoff);
        EnableWindow(GetDlgItem(hDlg, IDC_REASON_LIST), bNotLogoff);
        EnableWindow(GetDlgItem(hDlg, IDC_REASON_COMMENT), bNotLogoff);
    }
}
 
static VOID
ShutdownOnFriendlyInit(
    IN HWND hDlg,
    IN PSHUTDOWN_DLG_CONTEXT pContext)
{
    PGINA_CONTEXT pgContext = pContext->pgContext;
    HDC hdc;
    LONG lfHeight;
    BOOLEAN bCanSuspend = !!(pContext->ShutdownOptions & (WLX_SHUTDOWN_STATE_SLEEP | WLX_SHUTDOWN_STATE_SLEEP2));
    BOOLEAN bCanHibernate = !!(pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_HIBERNATE);
 
    /* Create font for the IDC_TURN_OFF_STATIC static control */
    hdc = GetDC(hDlg);
    lfHeight = -MulDiv(FONT_POINT_SIZE, GetDeviceCaps(hdc, LOGPIXELSY), 72);
    ReleaseDC(hDlg, hdc);
    pContext->hfFont = CreateFontW(lfHeight, 0, 0, 0, FW_MEDIUM, FALSE, 0, 0, 0, 0, 0, 0, 0, L"MS Shell Dlg");
    SendDlgItemMessageW(hDlg, IDC_TURN_OFF_STATIC, WM_SETFONT, (WPARAM)pContext->hfFont, TRUE);
 
    /* Create a brush for static controls for fancy shutdown dialog */
    pContext->hBrush = CreateSolidBrush(DARK_GREY_COLOR);
 
    /* Gather image strip */
    pContext->hImageStrip = LoadBitmapW(pgContext->hDllInstance, MAKEINTRESOURCEW(IDB_IMAGE_STRIP));
 
    /* Set the boolean flags to false */
    pContext->bIsSleepButtonReplaced = FALSE;
    pContext->bTimer = FALSE;
 
    EnableWindow(GetDlgItem(hDlg, IDC_BUTTON_HIBERNATE), bCanHibernate);
    EnableWindow(GetDlgItem(hDlg, IDC_BUTTON_SLEEP), bCanSuspend);
 
    /* Gather old button function */
    pContext->OldButtonProc = (WNDPROC)GetWindowLongPtrW(GetDlgItem(hDlg, IDC_BUTTON_HIBERNATE), GWLP_WNDPROC);
 
    /* Set bIsButtonHot to false, create tooltips for each buttons, make buttons to remember pContext and subclass the buttons */
    for (int i = 0; i < NUMBER_OF_BUTTONS; i++)
    {
        pContext->bIsButtonHot[i] = FALSE;
        SetWindowLongPtrW(GetDlgItem(hDlg, IDC_BUTTON_SHUTDOWN + i),
                          GWLP_WNDPROC,
                          (LONG_PTR)OwnerDrawButtonSubclass);
        CreateToolTipForButtons(IDC_BUTTON_SHUTDOWN + i,
                                IDS_SHUTDOWN_SHUTDOWN_DESC + i,
                                hDlg, IDS_SHUTDOWN_SHUTDOWN + i,
                                pgContext->hDllInstance);
    }
 
    if ((pContext->ShutdownDialogId == IDD_SHUTDOWN_FANCY) && bCanSuspend)
    {
        pContext->iTimer = SetTimer(hDlg, 0, 50, NULL);
        pContext->bTimer = TRUE;
    }
}
 
static VOID
ShutdownOnInit(
    IN HWND hDlg,
    IN PSHUTDOWN_DLG_CONTEXT pContext)
{
    PGINA_CONTEXT pgContext = pContext->pgContext;
    HWND hwndList;
    INT idx, count, i;
    WCHAR szBuffer[256];
    WCHAR szBuffer2[256];
 
    if (pContext->bFriendlyUI)
    {
        ShutdownOnFriendlyInit(hDlg, pContext);
        return;
    }
 
    hwndList = GetDlgItem(hDlg, IDC_SHUTDOWN_ACTION);
 
    /* Clear the content before it's used */
    SendMessageW(hwndList, CB_RESETCONTENT, 0, 0);
 
    /* Log off */
    if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_LOGOFF)
    {
        LoadStringW(pgContext->hDllInstance, IDS_SHUTDOWN_LOGOFF, szBuffer, _countof(szBuffer));
        StringCchPrintfW(szBuffer2, _countof(szBuffer2), szBuffer, pgContext->UserName);
        idx = SendMessageW(hwndList, CB_ADDSTRING, 0, (LPARAM)szBuffer2);
        if (idx != CB_ERR)
            SendMessageW(hwndList, CB_SETITEMDATA, idx, WLX_SAS_ACTION_LOGOFF);
    }
 
    /* Shut down */
    if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_POWER_OFF)
    {
        LoadStringW(pgContext->hDllInstance, IDS_SHUTDOWN_SHUTDOWN, szBuffer, _countof(szBuffer));
        idx = SendMessageW(hwndList, CB_ADDSTRING, 0, (LPARAM)szBuffer);
        if (idx != CB_ERR)
            SendMessageW(hwndList, CB_SETITEMDATA, idx, WLX_SAS_ACTION_SHUTDOWN_POWER_OFF);
    }
 
    /* Restart */
    if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_REBOOT)
    {
        LoadStringW(pgContext->hDllInstance, IDS_SHUTDOWN_RESTART, szBuffer, _countof(szBuffer));
        idx = SendMessageW(hwndList, CB_ADDSTRING, 0, (LPARAM)szBuffer);
        if (idx != CB_ERR)
            SendMessageW(hwndList, CB_SETITEMDATA, idx, WLX_SAS_ACTION_SHUTDOWN_REBOOT);
    }
 
    // if (pContext->ShutdownOptions & 0x08) {}
 
    /* Sleep */
    if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_SLEEP)
    {
        LoadStringW(pgContext->hDllInstance, IDS_SHUTDOWN_SLEEP, szBuffer, _countof(szBuffer));
        idx = SendMessageW(hwndList, CB_ADDSTRING, 0, (LPARAM)szBuffer);
        if (idx != CB_ERR)
            SendMessageW(hwndList, CB_SETITEMDATA, idx, WLX_SAS_ACTION_SHUTDOWN_SLEEP);
    }
 
    // if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_SLEEP2) {}
 
    /* Hibernate */
    if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_HIBERNATE)
    {
        LoadStringW(pgContext->hDllInstance, IDS_SHUTDOWN_HIBERNATE, szBuffer, _countof(szBuffer));
        idx = SendMessageW(hwndList, CB_ADDSTRING, 0, (LPARAM)szBuffer);
        if (idx != CB_ERR)
            SendMessageW(hwndList, CB_SETITEMDATA, idx, WLX_SAS_ACTION_SHUTDOWN_HIBERNATE);
    }
 
    // if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_DISCONNECT) {}
 
    // if (pContext->ShutdownOptions & WLX_SHUTDOWN_AUTOUPDATE) {}
 
    /* Set the default selection */
    count = SendMessageW(hwndList, CB_GETCOUNT, 0, 0);
    for (i = 0; i < count; i++)
    {
        if (SendMessageW(hwndList, CB_GETITEMDATA, i, 0) == pgContext->nShutdownAction)
        {
            SendMessageW(hwndList, CB_SETCURSEL, i, 0);
            break;
        }
    }
    /* If no item was selected (nShutdownAction with value 0 or invalid,
     * or an action that is currently unavailable), set the selection to
     * the first list item. */
    if (count && (SendMessageW(hwndList, CB_GETCURSEL, 0, 0) == CB_ERR))
        SendMessageW(hwndList, CB_SETCURSEL, 0, 0);
 
    /* Update the choice description based on the current selection */
    UpdateShutdownDesc(hDlg, pContext);
}
 
static VOID
ShutdownOnOk(
    _In_ HWND hDlg,
    _In_ PGINA_CONTEXT pgContext)
{
    HWND hwndList = GetDlgItem(hDlg, IDC_SHUTDOWN_ACTION);
    DWORD ShutdownCode = SendMessageW(hwndList, CB_GETCURSEL, 0, 0);
    if (ShutdownCode != CB_ERR)
    {
        ShutdownCode = SendMessageW(hwndList, CB_GETITEMDATA, ShutdownCode, 0);
        if (ShutdownCode != CB_ERR)
            pgContext->nShutdownAction = ShutdownCode;
    }
}
 
static INT_PTR
CALLBACK
ShutdownDialogProc(
    HWND hDlg,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam)
{
    PSHUTDOWN_DLG_CONTEXT pContext;
 
    pContext = (PSHUTDOWN_DLG_CONTEXT)GetWindowLongPtrW(hDlg, GWLP_USERDATA);
 
    switch (uMsg)
    {
        case WM_INITDIALOG:
        {
            pContext = (PSHUTDOWN_DLG_CONTEXT)lParam;
            SetWindowLongPtrW(hDlg, GWLP_USERDATA, (LONG_PTR)pContext);
            ShutdownOnInit(hDlg, pContext);
            return TRUE;
        }
 
        case WM_DESTROY:
            if (pContext->bFriendlyUI)
                EndFriendlyDialog(hDlg, pContext);
            return TRUE;
 
        case WM_ACTIVATE:
        {
            /*
             * If the user deactivates the shutdown dialog (it loses its focus
             * while the dialog is not being closed), then destroy the dialog
             * and cancel shutdown.
             */
            if (LOWORD(wParam) == WA_INACTIVE)
            {
                if (!pContext->bCloseDlg)
                {
                    pContext->bCloseDlg = TRUE;
                    EndDialog(hDlg, IDCANCEL);
                }
            }
            return FALSE;
        }
 
        case WM_CLOSE:
            pContext->bCloseDlg = TRUE;
            EndDialog(hDlg, IDCANCEL);
            break;
 
        case WM_COMMAND:
            switch (LOWORD(wParam))
            {
                /* Check for fancy shutdown dialog buttons */
                case IDC_BUTTON_SHUTDOWN: case IDC_BUTTON_REBOOT:
                case IDC_BUTTON_SLEEP:    case IDC_BUTTON_HIBERNATE:
                {
                    DWORD Button = LOWORD(wParam);
                    PGINA_CONTEXT pgContext = pContext->pgContext;
                    pgContext->nShutdownAction = 0;
                    if (Button == IDC_BUTTON_SHUTDOWN)
                    {
                        if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_POWER_OFF)
                            pgContext->nShutdownAction = WLX_SAS_ACTION_SHUTDOWN_POWER_OFF;
                    }
                    else if (Button == IDC_BUTTON_REBOOT)
                    {
                        if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_REBOOT)
                            pgContext->nShutdownAction = WLX_SAS_ACTION_SHUTDOWN_REBOOT;
                    }
                    else if (Button == IDC_BUTTON_SLEEP)
                    {
                        if (pContext->ShutdownOptions & (WLX_SHUTDOWN_STATE_SLEEP | WLX_SHUTDOWN_STATE_SLEEP2))
                        {
                            /* Choose "Sleep with wakeup events disabled" if
                             * available, otherwise use the regular sleep mode */
                            if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_SLEEP2)
                                pgContext->nShutdownAction = WLX_SAS_ACTION_SHUTDOWN_SLEEP2;
                            else
                                pgContext->nShutdownAction = WLX_SAS_ACTION_SHUTDOWN_SLEEP;
                        }
                    }
                    else if (Button == IDC_BUTTON_HIBERNATE)
                    {
                        if (pContext->ShutdownOptions & WLX_SHUTDOWN_STATE_HIBERNATE)
                            pgContext->nShutdownAction = WLX_SAS_ACTION_SHUTDOWN_HIBERNATE;
                    }
                    if (pgContext->nShutdownAction == 0)
                        break;
 
                    pContext->bCloseDlg = TRUE;
                    EndDialog(hDlg, IDOK);
                    break;
                }
 
                /* Classic shutdown dialog buttons */
                case IDOK:
                    ShutdownOnOk(hDlg, pContext->pgContext);
 
                /* Fall back */
                case IDCANCEL:
                case IDHELP:
                    pContext->bCloseDlg = TRUE;
                    EndDialog(hDlg, LOWORD(wParam));
                    break;
 
                case IDC_SHUTDOWN_ACTION:
                    UpdateShutdownDesc(hDlg, pContext);
                    break;
            }
            break;
 
        case WM_CTLCOLORSTATIC:
        {
            /* Either make background transparent or fill it with color for required static controls */
            HDC hdcStatic = (HDC)wParam;
            UINT StaticID = (UINT)GetWindowLongPtrW((HWND)lParam, GWL_ID);
 
            switch (StaticID)
            {
                case IDC_TURN_OFF_STATIC:
                   SetTextColor(hdcStatic, DARK_GREY_COLOR);
                   SetBkMode(hdcStatic, TRANSPARENT);
                   return (INT_PTR)GetStockObject(HOLLOW_BRUSH);
 
                case IDC_HIBERNATE_STATIC:
                case IDC_SHUTDOWN_STATIC:
                case IDC_SLEEP_STATIC:
                case IDC_RESTART_STATIC:
                    SetTextColor(hdcStatic, LIGHT_GREY_COLOR);
                    SetBkMode(hdcStatic, TRANSPARENT);
                    return (LONG_PTR)pContext->hBrush;
            }
            return FALSE;
        }
 
        case WM_DRAWITEM:
        {
            /* Draw bitmaps on required buttons */
            DRAWITEMSTRUCT* pdis = (DRAWITEMSTRUCT*)lParam;
            switch (pdis->CtlID)
            {
                case IDC_BUTTON_SHUTDOWN:
                case IDC_BUTTON_REBOOT:
                case IDC_BUTTON_SLEEP:
                case IDC_BUTTON_HIBERNATE:
                    return DrawIconOnOwnerDrawnButtons(pdis, pContext);
            }
            break;
        }
 
        case WM_TIMER:
            OnTimer(hDlg, pContext);
            return TRUE;
 
        default:
            return FALSE;
    }
    return TRUE;
}
 
INT_PTR
ShutdownDialog(
    IN HWND hwndDlg,
    IN DWORD ShutdownOptions,
    IN PGINA_CONTEXT pgContext)
{
    INT_PTR ret;
    SHUTDOWN_DLG_CONTEXT Context = {0};
 
#if 0
    ShutdownOptions = GetAllowedShutdownOptions(hKeyCurrentUser, pgContext->UserToken);
    pgContext->nShutdownAction = LoadShutdownSelState(hKeyCurrentUser);
    ShutdownOptions &= ~dwExcludeOptions;
#endif
 
    /* Bail out early if no shutdown options are available */
    if (ShutdownOptions == 0)
        return IDCANCEL;
 
    Context.pgContext = pgContext;
    Context.ShutdownOptions = ShutdownOptions;
    Context.ShutdownDialogId = IDD_SHUTDOWN;
    Context.bCloseDlg = FALSE;
    Context.bReasonUI = GetShutdownReasonUI();
    Context.bFriendlyUI = ShellIsFriendlyUIActive();
 
    if (pgContext->hWlx && pgContext->pWlxFuncs && !Context.bFriendlyUI)
    {
        ret = pgContext->pWlxFuncs->WlxDialogBoxParam(pgContext->hWlx,
                                                      pgContext->hDllInstance,
                                                      MAKEINTRESOURCEW(Context.bReasonUI ? IDD_SHUTDOWN_REASON : IDD_SHUTDOWN),
                                                      hwndDlg,
                                                      ShutdownDialogProc,
                                                      (LPARAM)&Context);
    }
    else
    {
        if (Context.bFriendlyUI)
        {
            if (IsShowHibernateButtonActive())
                Context.ShutdownDialogId = IDD_SHUTDOWN_FANCY_LONG;
            else
                Context.ShutdownDialogId = IDD_SHUTDOWN_FANCY;
        }
 
        ret = DialogBoxParamW(pgContext->hDllInstance,
                              MAKEINTRESOURCEW(Context.bReasonUI ? IDD_SHUTDOWN_REASON : Context.ShutdownDialogId),
                              hwndDlg,
                              ShutdownDialogProc,
                              (LPARAM)&Context);
    }
 
    // TODO: Handle shutdown reasons.
 
#if 0
    if (ret == IDOK)
        SaveShutdownSelState(hKeyCurrentUser, pgContext->nShutdownAction);
#endif
 
    return ret;
}
 
 
/*
 * NOTES:
 * - Based upon observations on the ShellShutdownDialog() function, the function doesn't actually
 *   do anything except show a dialog box and returning a value based upon the value chosen. That
 *   means that any code that calls the function has to execute the chosen action (shut down,
 *   restart, etc.).
 * - When this function is called in Windows XP, it shows the classic dialog box regardless if
 *   SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\LogonType is enabled or not.
 * - When the Help button is pushed, it sends the same return value as IDCANCEL (0x00), but
 *   at the same time, it calls the help file directly from the dialog box.
 * - When the dialog is created, it doesn't disable all other input from the other windows.
 *   This is done elsewhere. When running the function ShellShutdownDialog() from XP/2K3, if the user
 *   clicks out of the window, it automatically closes itself.
 * - The parameter pUserName, never seems to be used when calling the function from Windows XP. Either
 *   it was a parameter that was never used in the final version before release, or it has a use that
 *   is currently not known.
 */
DWORD WINAPI
ShellShutdownDialog(
    _In_ HWND hWndParent,
    _In_opt_ LPCWSTR pUserName,
    _In_ DWORD dwExcludeOptions)
{
    INT_PTR dlgValue;
    DWORD ShutdownOptions;
 
    /*
     * As we are called by the shell itself, don't use
     * the cached GINA context but use a local copy here.
     */
    GINA_CONTEXT gContext = {0};
 
    ShutdownOptions = GetAllowedShutdownOptions(HKEY_CURRENT_USER, NULL);
    ShutdownOptions &= ~dwExcludeOptions;
 
    /* Initialize our local GINA context */
    gContext.hDllInstance = hDllInstance;
    gContext.nShutdownAction = LoadShutdownSelState(HKEY_CURRENT_USER);
    if (gContext.nShutdownAction == 0)
        gContext.nShutdownAction = WLX_SAS_ACTION_SHUTDOWN_POWER_OFF;
 
    if (pUserName)
    {
        /* Use the caller-given user name */
        StringCbCopyW(gContext.UserName, sizeof(gContext.UserName), pUserName);
    }
    else
    {
        /* Use either the convenience "Logon User Name" registered by
         * WlxActivateUserShell(), or if not found, retrieve a user name
         * via GetUserNameW() */
        HKEY hKey;
        LONG lRet;
        lRet = RegOpenKeyExW(HKEY_CURRENT_USER,
                             L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer",
                             0,
                             KEY_QUERY_VALUE, &hKey);
        if (lRet == ERROR_SUCCESS)
        {
            DWORD dwType, cbData = sizeof(gContext.UserName);
            lRet = RegQueryValueExW(hKey,
                                    L"Logon User Name",
                                    NULL,
                                    &dwType,
                                    (PBYTE)gContext.UserName,
                                    &cbData);
            RegCloseKey(hKey);
 
            /* NULL-terminate the string */
            if (lRet != ERROR_SUCCESS)
                cbData = 0;
            gContext.UserName[cbData / sizeof(WCHAR)] = UNICODE_NULL;
        }
        else
        {
            DWORD BufferSize = _countof(gContext.UserName);
            GetUserNameW(gContext.UserName, &BufferSize);
        }
    }
 
    /* Load the shutdown dialog box */
    dlgValue = ShutdownDialog(hWndParent, ShutdownOptions, &gContext);
 
    /* Determine what to do based on user selection */
    if (dlgValue == IDOK)
    {
        SaveShutdownSelState(HKEY_CURRENT_USER, gContext.nShutdownAction);
 
        switch (gContext.nShutdownAction)
        {
            case WLX_SAS_ACTION_LOGOFF:
                return WLX_SHUTDOWN_STATE_LOGOFF;
 
            case WLX_SAS_ACTION_SHUTDOWN_POWER_OFF:
                return WLX_SHUTDOWN_STATE_POWER_OFF;
 
            case WLX_SAS_ACTION_SHUTDOWN_REBOOT:
                return WLX_SHUTDOWN_STATE_REBOOT;
 
            // 0x08
 
            case WLX_SAS_ACTION_SHUTDOWN_SLEEP:
                return WLX_SHUTDOWN_STATE_SLEEP;
 
            case WLX_SAS_ACTION_SHUTDOWN_SLEEP2:
                return WLX_SHUTDOWN_STATE_SLEEP2;
 
            case WLX_SAS_ACTION_SHUTDOWN_HIBERNATE:
                return WLX_SHUTDOWN_STATE_HIBERNATE;
 
            // WLX_SHUTDOWN_STATE_DISCONNECT
        }
    }
    /* Help file is called directly here */
    else if (dlgValue == IDHELP)
    {
        FIXME("Help is not implemented yet.\n");
        MessageBoxW(hWndParent, L"Help is not implemented yet.", L"Message", MB_OK | MB_ICONEXCLAMATION);
    }
    else if (dlgValue == -1)
    {
        ERR("Failed to create dialog\n");
    }
 
    return 0;
}
 
/*
 * NOTES:
 * - Undocumented, called from MS shell32.dll to show the turn off dialog.
 * - Seems to have the same purpose as ShellShutdownDialog.
 */
DWORD WINAPI
ShellTurnOffDialog(HWND hWnd)
{
    return ShellShutdownDialog(hWnd, NULL, 0);
}