wine/dlls/win32u/message.c

/*
 * Window messaging support
 *
 * Copyright 2001 Alexandre Julliard
 * Copyright 2008 Maarten Lankhorst
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */


#if 0
#pragma makedep unix
#endif

#include "win32u_private.h"
#include "ntuser_private.h"
#include "wine/server.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(msg);

#define MAX_WINPROC_RECURSION  64

#define MAX_PACK_COUNT 4

struct packed_hook_extra_info
{
    user_handle_t handle;
    DWORD         __pad;
    ULONGLONG     lparam;
};

/* the structures are unpacked on top of the packed ones, so make sure they fit */
C_ASSERT( sizeof(struct packed_CREATESTRUCTW) >= sizeof(CREATESTRUCTW) );
C_ASSERT( sizeof(struct packed_DRAWITEMSTRUCT) >= sizeof(DRAWITEMSTRUCT) );
C_ASSERT( sizeof(struct packed_MEASUREITEMSTRUCT) >= sizeof(MEASUREITEMSTRUCT) );
C_ASSERT( sizeof(struct packed_DELETEITEMSTRUCT) >= sizeof(DELETEITEMSTRUCT) );
C_ASSERT( sizeof(struct packed_COMPAREITEMSTRUCT) >= sizeof(COMPAREITEMSTRUCT) );
C_ASSERT( sizeof(struct packed_WINDOWPOS) >= sizeof(WINDOWPOS) );
C_ASSERT( sizeof(struct packed_COPYDATASTRUCT) >= sizeof(COPYDATASTRUCT) );
C_ASSERT( sizeof(struct packed_HELPINFO) >= sizeof(HELPINFO) );
C_ASSERT( sizeof(struct packed_NCCALCSIZE_PARAMS) >= sizeof(NCCALCSIZE_PARAMS) + sizeof(WINDOWPOS) );
C_ASSERT( sizeof(struct packed_MSG) >= sizeof(MSG) );
C_ASSERT( sizeof(struct packed_MDINEXTMENU) >= sizeof(MDINEXTMENU) );
C_ASSERT( sizeof(struct packed_MDICREATESTRUCTW) >= sizeof(MDICREATESTRUCTW) );
C_ASSERT( sizeof(struct packed_hook_extra_info) >= sizeof(struct hook_extra_info) );

union packed_structs
{
    struct packed_CREATESTRUCTW cs;
    struct packed_DRAWITEMSTRUCT dis;
    struct packed_MEASUREITEMSTRUCT mis;
    struct packed_DELETEITEMSTRUCT dls;
    struct packed_COMPAREITEMSTRUCT cis;
    struct packed_WINDOWPOS wp;
    struct packed_COPYDATASTRUCT cds;
    struct packed_HELPINFO hi;
    struct packed_NCCALCSIZE_PARAMS ncp;
    struct packed_MSG msg;
    struct packed_MDINEXTMENU mnm;
    struct packed_MDICREATESTRUCTW mcs;
    struct packed_hook_extra_info hook;
};

/* description of the data fields that need to be packed along with a sent message */
struct packed_message
{
    union packed_structs ps;
    int                  count;
    const void          *data[MAX_PACK_COUNT];
    size_t               size[MAX_PACK_COUNT];
};

static BOOL init_win_proc_params( struct win_proc_params *params, HWND hwnd, UINT msg,
                                  WPARAM wparam, LPARAM lparam, BOOL ansi )
{
    if (!params->func) return FALSE;

    user_check_not_lock();

    params->hwnd = get_full_window_handle( hwnd );
    params->msg = msg;
    params->wparam = wparam;
    params->lparam = lparam;
    params->ansi = params->ansi_dst = ansi;
    params->is_dialog = FALSE;
    params->needs_unpack = FALSE;
    params->mapping = WMCHAR_MAP_CALLWINDOWPROC;
    params->dpi_awareness = get_window_dpi_awareness_context( params->hwnd );
    get_winproc_params( params );
    return TRUE;
}

static BOOL init_window_call_params( struct win_proc_params *params, HWND hwnd, UINT msg, WPARAM wParam,
                                     LPARAM lParam, LRESULT *result, BOOL ansi,
                                     enum wm_char_mapping mapping )
{
    WND *win;

    user_check_not_lock();

    if (!(win = get_win_ptr( hwnd ))) return FALSE;
    if (win == WND_OTHER_PROCESS || win == WND_DESKTOP) return FALSE;
    if (win->tid != GetCurrentThreadId())
    {
        release_win_ptr( win );
        return FALSE;
    }
    params->func = win->winproc;
    params->ansi_dst = !(win->flags & WIN_ISUNICODE);
    params->is_dialog = win->dlgInfo != NULL;
    release_win_ptr( win );

    params->hwnd = get_full_window_handle( hwnd );
    get_winproc_params( params );
    params->msg = msg;
    params->wparam = wParam;
    params->lparam = lParam;
    params->result = result;
    params->ansi = ansi;
    params->needs_unpack = FALSE;
    params->mapping = mapping;
    params->dpi_awareness = get_window_dpi_awareness_context( params->hwnd );
    return TRUE;
}

static BOOL dispatch_win_proc_params( struct win_proc_params *params, size_t size )
{
    struct user_thread_info *thread_info = get_user_thread_info();
    void *ret_ptr;
    ULONG ret_len;

    if (thread_info->recursion_count > MAX_WINPROC_RECURSION) return FALSE;
    thread_info->recursion_count++;

    KeUserModeCallback( NtUserCallWindowProc, params, size, &ret_ptr, &ret_len );

    thread_info->recursion_count--;
    return TRUE;
}

/* add a data field to a packed message */
static inline void push_data( struct packed_message *data, const void *ptr, size_t size )
{
    data->data[data->count] = ptr;
    data->size[data->count] = size;
    data->count++;
}

/* pack a pointer into a 32/64 portable format */
static inline ULONGLONG pack_ptr( const void *ptr )
{
    return (ULONG_PTR)ptr;
}

/***********************************************************************
 *           pack_reply
 *
 * Pack a reply to a message for sending to another process.
 */
static void pack_reply( HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam,
                        LRESULT res, struct packed_message *data )
{
    data->count = 0;
    switch(message)
    {
    case WM_NCCREATE:
    case WM_CREATE:
    {
        CREATESTRUCTW *cs = (CREATESTRUCTW *)lparam;
        data->ps.cs.lpCreateParams = (ULONG_PTR)cs->lpCreateParams;
        data->ps.cs.hInstance      = (ULONG_PTR)cs->hInstance;
        data->ps.cs.hMenu          = wine_server_user_handle( cs->hMenu );
        data->ps.cs.hwndParent     = wine_server_user_handle( cs->hwndParent );
        data->ps.cs.cy             = cs->cy;
        data->ps.cs.cx             = cs->cx;
        data->ps.cs.y              = cs->y;
        data->ps.cs.x              = cs->x;
        data->ps.cs.style          = cs->style;
        data->ps.cs.dwExStyle      = cs->dwExStyle;
        data->ps.cs.lpszName       = (ULONG_PTR)cs->lpszName;
        data->ps.cs.lpszClass      = (ULONG_PTR)cs->lpszClass;
        push_data( data, &data->ps.cs, sizeof(data->ps.cs) );
        break;
    }
    case WM_GETTEXT:
    case CB_GETLBTEXT:
    case LB_GETTEXT:
        push_data( data, (WCHAR *)lparam, (res + 1) * sizeof(WCHAR) );
        break;
    case WM_GETMINMAXINFO:
        push_data( data, (MINMAXINFO *)lparam, sizeof(MINMAXINFO) );
        break;
    case WM_MEASUREITEM:
    {
        MEASUREITEMSTRUCT *mis = (MEASUREITEMSTRUCT *)lparam;
        data->ps.mis.CtlType    = mis->CtlType;
        data->ps.mis.CtlID      = mis->CtlID;
        data->ps.mis.itemID     = mis->itemID;
        data->ps.mis.itemWidth  = mis->itemWidth;
        data->ps.mis.itemHeight = mis->itemHeight;
        data->ps.mis.itemData   = mis->itemData;
        push_data( data, &data->ps.mis, sizeof(data->ps.mis) );
        break;
    }
    case WM_WINDOWPOSCHANGING:
    case WM_WINDOWPOSCHANGED:
    {
        WINDOWPOS *wp = (WINDOWPOS *)lparam;
        data->ps.wp.hwnd            = wine_server_user_handle( wp->hwnd );
        data->ps.wp.hwndInsertAfter = wine_server_user_handle( wp->hwndInsertAfter );
        data->ps.wp.x               = wp->x;
        data->ps.wp.y               = wp->y;
        data->ps.wp.cx              = wp->cx;
        data->ps.wp.cy              = wp->cy;
        data->ps.wp.flags           = wp->flags;
        push_data( data, &data->ps.wp, sizeof(data->ps.wp) );
        break;
    }
    case WM_GETDLGCODE:
        if (lparam)
        {
            MSG *msg = (MSG *)lparam;
            data->ps.msg.hwnd    = wine_server_user_handle( msg->hwnd );
            data->ps.msg.message = msg->message;
            data->ps.msg.wParam  = msg->wParam;
            data->ps.msg.lParam  = msg->lParam;
            data->ps.msg.time    = msg->time;
            data->ps.msg.pt      = msg->pt;
            push_data( data, &data->ps.msg, sizeof(data->ps.msg) );
        }
        break;
    case SBM_GETSCROLLINFO:
        push_data( data, (SCROLLINFO *)lparam, sizeof(SCROLLINFO) );
        break;
    case EM_GETRECT:
    case LB_GETITEMRECT:
    case CB_GETDROPPEDCONTROLRECT:
    case WM_SIZING:
    case WM_MOVING:
        push_data( data, (RECT *)lparam, sizeof(RECT) );
        break;
    case EM_GETLINE:
    {
        WORD *ptr = (WORD *)lparam;
        push_data( data, ptr, ptr[-1] * sizeof(WCHAR) );
        break;
    }
    case LB_GETSELITEMS:
        push_data( data, (UINT *)lparam, wparam * sizeof(UINT) );
        break;
    case WM_MDIGETACTIVE:
        if (lparam) push_data( data, (BOOL *)lparam, sizeof(BOOL) );
        break;
    case WM_NCCALCSIZE:
        if (!wparam)
            push_data( data, (RECT *)lparam, sizeof(RECT) );
        else
        {
            NCCALCSIZE_PARAMS *ncp = (NCCALCSIZE_PARAMS *)lparam;
            data->ps.ncp.rgrc[0]         = ncp->rgrc[0];
            data->ps.ncp.rgrc[1]         = ncp->rgrc[1];
            data->ps.ncp.rgrc[2]         = ncp->rgrc[2];
            data->ps.ncp.hwnd            = wine_server_user_handle( ncp->lppos->hwnd );
            data->ps.ncp.hwndInsertAfter = wine_server_user_handle( ncp->lppos->hwndInsertAfter );
            data->ps.ncp.x               = ncp->lppos->x;
            data->ps.ncp.y               = ncp->lppos->y;
            data->ps.ncp.cx              = ncp->lppos->cx;
            data->ps.ncp.cy              = ncp->lppos->cy;
            data->ps.ncp.flags           = ncp->lppos->flags;
            push_data( data, &data->ps.ncp, sizeof(data->ps.ncp) );
        }
        break;
    case EM_GETSEL:
    case SBM_GETRANGE:
    case CB_GETEDITSEL:
        if (wparam) push_data( data, (DWORD *)wparam, sizeof(DWORD) );
        if (lparam) push_data( data, (DWORD *)lparam, sizeof(DWORD) );
        break;
    case WM_NEXTMENU:
    {
        MDINEXTMENU *mnm = (MDINEXTMENU *)lparam;
        data->ps.mnm.hmenuIn   = wine_server_user_handle( mnm->hmenuIn );
        data->ps.mnm.hmenuNext = wine_server_user_handle( mnm->hmenuNext );
        data->ps.mnm.hwndNext  = wine_server_user_handle( mnm->hwndNext );
        push_data( data, &data->ps.mnm, sizeof(data->ps.mnm) );
        break;
    }
    case WM_MDICREATE:
    {
        MDICREATESTRUCTW *mcs = (MDICREATESTRUCTW *)lparam;
        data->ps.mcs.szClass = pack_ptr( mcs->szClass );
        data->ps.mcs.szTitle = pack_ptr( mcs->szTitle );
        data->ps.mcs.hOwner  = pack_ptr( mcs->hOwner );
        data->ps.mcs.x       = mcs->x;
        data->ps.mcs.y       = mcs->y;
        data->ps.mcs.cx      = mcs->cx;
        data->ps.mcs.cy      = mcs->cy;
        data->ps.mcs.style   = mcs->style;
        data->ps.mcs.lParam  = mcs->lParam;
        push_data( data, &data->ps.mcs, sizeof(data->ps.mcs) );
        break;
    }
    case WM_ASKCBFORMATNAME:
        push_data( data, (WCHAR *)lparam, (lstrlenW((WCHAR *)lparam) + 1) * sizeof(WCHAR) );
        break;
    }
}

/***********************************************************************
 *           reply_message
 *
 * Send a reply to a sent message.
 */
static void reply_message( struct received_message_info *info, LRESULT result, MSG *msg )
{
    struct packed_message data;
    int i, replied = info->flags & ISMEX_REPLIED;

    if (info->flags & ISMEX_NOTIFY) return;  /* notify messages don't get replies */
    if (!msg && replied) return;  /* replied already */

    memset( &data, 0, sizeof(data) );
    info->flags |= ISMEX_REPLIED;

    if (info->type == MSG_OTHER_PROCESS && !replied)
    {
        pack_reply( msg->hwnd, msg->message, msg->wParam, msg->lParam, result, &data );
    }

    SERVER_START_REQ( reply_message )
    {
        req->result = result;
        req->remove = msg != NULL;
        for (i = 0; i < data.count; i++) wine_server_add_data( req, data.data[i], data.size[i] );
        wine_server_call( req );
    }
    SERVER_END_REQ;
}

/***********************************************************************
 *           reply_message_result
 *
 * Send a reply to a sent message and update thread receive info.
 */
BOOL reply_message_result( LRESULT result, MSG *msg )
{
    struct received_message_info *info = get_user_thread_info()->receive_info;

    if (!info) return FALSE;
    reply_message( info, result, msg );
    if (msg) get_user_thread_info()->receive_info = info->prev;
    return TRUE;
}

/***********************************************************************
 *           handle_internal_message
 *
 * Handle an internal Wine message instead of calling the window proc.
 */
LRESULT handle_internal_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
{
    switch(msg)
    {
    case WM_WINE_DESTROYWINDOW:
        return destroy_window( hwnd );
    case WM_WINE_SETWINDOWPOS:
        if (is_desktop_window( hwnd )) return 0;
        return set_window_pos( (WINDOWPOS *)lparam, 0, 0 );
    case WM_WINE_SHOWWINDOW:
        if (is_desktop_window( hwnd )) return 0;
        return NtUserShowWindow( hwnd, wparam );
    case WM_WINE_SETPARENT:
        if (is_desktop_window( hwnd )) return 0;
        return HandleToUlong( NtUserSetParent( hwnd, UlongToHandle(wparam) ));
    case WM_WINE_SETWINDOWLONG:
        return set_window_long( hwnd, (short)LOWORD(wparam), HIWORD(wparam), lparam, FALSE );
    case WM_WINE_SETSTYLE:
        if (is_desktop_window( hwnd )) return 0;
        return set_window_style( hwnd, wparam, lparam );
    case WM_WINE_SETACTIVEWINDOW:
        if (!wparam && NtUserGetForegroundWindow() == hwnd) return 0;
        return (LRESULT)NtUserSetActiveWindow( (HWND)wparam );
    case WM_WINE_KEYBOARD_LL_HOOK:
    case WM_WINE_MOUSE_LL_HOOK:
    {
        struct hook_extra_info *h_extra = (struct hook_extra_info *)lparam;

        return call_current_hook( h_extra->handle, HC_ACTION, wparam, h_extra->lparam );
    }
    case WM_WINE_CLIPCURSOR:
        if (wparam)
        {
            RECT rect;
            get_clip_cursor( &rect );
            return user_driver->pClipCursor( &rect );
        }
        return user_driver->pClipCursor( NULL );
    case WM_WINE_UPDATEWINDOWSTATE:
        update_window_state( hwnd );
        return 0;
    default:
        if (msg >= WM_WINE_FIRST_DRIVER_MSG && msg <= WM_WINE_LAST_DRIVER_MSG)
            return user_driver->pWindowMessage( hwnd, msg, wparam, lparam );
        FIXME( "unknown internal message %x\n", msg );
        return 0;
    }
}

/***********************************************************************
 *           NtUserWaitForInputIdle (win32u.@)
 */
DWORD WINAPI NtUserWaitForInputIdle( HANDLE process, DWORD timeout, BOOL wow )
{
    if (!user_callbacks) return 0;
    return user_callbacks->pWaitForInputIdle( process, timeout );
}

/**********************************************************************
 *	     NtUserGetGUIThreadInfo  (win32u.@)
 */
BOOL WINAPI NtUserGetGUIThreadInfo( DWORD id, GUITHREADINFO *info )
{
    BOOL ret;

    if (info->cbSize != sizeof(*info))
    {
        SetLastError( ERROR_INVALID_PARAMETER );
        return FALSE;
    }

    SERVER_START_REQ( get_thread_input )
    {
        req->tid = id;
        if ((ret = !wine_server_call_err( req )))
        {
            info->flags          = 0;
            info->hwndActive     = wine_server_ptr_handle( reply->active );
            info->hwndFocus      = wine_server_ptr_handle( reply->focus );
            info->hwndCapture    = wine_server_ptr_handle( reply->capture );
            info->hwndMenuOwner  = wine_server_ptr_handle( reply->menu_owner );
            info->hwndMoveSize   = wine_server_ptr_handle( reply->move_size );
            info->hwndCaret      = wine_server_ptr_handle( reply->caret );
            info->rcCaret.left   = reply->rect.left;
            info->rcCaret.top    = reply->rect.top;
            info->rcCaret.right  = reply->rect.right;
            info->rcCaret.bottom = reply->rect.bottom;
            if (reply->menu_owner) info->flags |= GUI_INMENUMODE;
            if (reply->move_size) info->flags |= GUI_INMOVESIZE;
            if (reply->caret) info->flags |= GUI_CARETBLINKING;
        }
    }
    SERVER_END_REQ;
    return ret;
}

/**********************************************************************
 *           dispatch_message
 */
LRESULT dispatch_message( const MSG *msg, BOOL ansi )
{
    struct win_proc_params params;
    LRESULT retval = 0;

    /* Process timer messages */
    if (msg->lParam && (msg->message == WM_TIMER || msg->message == WM_SYSTIMER))
    {
        params.func = (WNDPROC)msg->lParam;
        params.result = &retval; /* FIXME */
        if (!init_win_proc_params( &params, msg->hwnd, msg->message,
                                   msg->wParam, NtGetTickCount(), ansi ))
            return 0;
        __TRY
        {
            dispatch_win_proc_params( &params, sizeof(params) );
        }
        __EXCEPT
        {
            retval = 0;
        }
        __ENDTRY
        return retval;
    }
    if (!msg->hwnd) return 0;

    spy_enter_message( SPY_DISPATCHMESSAGE, msg->hwnd, msg->message, msg->wParam, msg->lParam );

    if (init_window_call_params( &params, msg->hwnd, msg->message, msg->wParam, msg->lParam,
                                 &retval, ansi, WMCHAR_MAP_DISPATCHMESSAGE ))
        dispatch_win_proc_params( &params, sizeof(params) );
    else if (!is_window( msg->hwnd )) SetLastError( ERROR_INVALID_WINDOW_HANDLE );
    else SetLastError( ERROR_MESSAGE_SYNC_ONLY );

    spy_exit_message( SPY_RESULT_OK, msg->hwnd, msg->message, retval, msg->wParam, msg->lParam );

    if (msg->message == WM_PAINT)
    {
        /* send a WM_NCPAINT and WM_ERASEBKGND if the non-client area is still invalid */
        HRGN hrgn = NtGdiCreateRectRgn( 0, 0, 0, 0 );
        NtUserGetUpdateRgn( msg->hwnd, hrgn, TRUE );
        NtGdiDeleteObjectApp( hrgn );
    }
    return retval;
}

/**********************************************************************
 *           NtUserDispatchMessage  (win32u.@)
 */
LRESULT WINAPI NtUserDispatchMessage( const MSG *msg )
{
    return dispatch_message( msg, FALSE );
}

/***********************************************************************
 *           NtUserSetTimer (win32u.@)
 */
UINT_PTR WINAPI NtUserSetTimer( HWND hwnd, UINT_PTR id, UINT timeout, TIMERPROC proc, ULONG tolerance )
{
    UINT_PTR ret;
    WNDPROC winproc = 0;

    if (proc) winproc = alloc_winproc( (WNDPROC)proc, TRUE );

    timeout = min( max( USER_TIMER_MINIMUM, timeout ), USER_TIMER_MAXIMUM );

    SERVER_START_REQ( set_win_timer )
    {
        req->win    = wine_server_user_handle( hwnd );
        req->msg    = WM_TIMER;
        req->id     = id;
        req->rate   = timeout;
        req->lparam = (ULONG_PTR)winproc;
        if (!wine_server_call_err( req ))
        {
            ret = reply->id;
            if (!ret) ret = TRUE;
        }
        else ret = 0;
    }
    SERVER_END_REQ;

    TRACE( "Added %p %lx %p timeout %d\n", hwnd, id, winproc, timeout );
    return ret;
}

/***********************************************************************
 *           NtUserSetSystemTimer (win32u.@)
 */
UINT_PTR WINAPI NtUserSetSystemTimer( HWND hwnd, UINT_PTR id, UINT timeout, TIMERPROC proc )
{
    UINT_PTR ret;
    WNDPROC winproc = 0;

    if (proc) winproc = alloc_winproc( (WNDPROC)proc, TRUE );

    timeout = min( max( USER_TIMER_MINIMUM, timeout ), USER_TIMER_MAXIMUM );

    SERVER_START_REQ( set_win_timer )
    {
        req->win    = wine_server_user_handle( hwnd );
        req->msg    = WM_SYSTIMER;
        req->id     = id;
        req->rate   = timeout;
        req->lparam = (ULONG_PTR)winproc;
        if (!wine_server_call_err( req ))
        {
            ret = reply->id;
            if (!ret) ret = TRUE;
        }
        else ret = 0;
    }
    SERVER_END_REQ;

    TRACE( "Added %p %lx %p timeout %d\n", hwnd, id, winproc, timeout );
    return ret;
}

/***********************************************************************
 *           NtUserKillTimer (win32u.@)
 */
BOOL WINAPI NtUserKillTimer( HWND hwnd, UINT_PTR id )
{
    BOOL ret;

    SERVER_START_REQ( kill_win_timer )
    {
        req->win = wine_server_user_handle( hwnd );
        req->msg = WM_TIMER;
        req->id  = id;
        ret = !wine_server_call_err( req );
    }
    SERVER_END_REQ;
    return ret;
}

/* see KillSystemTimer */
BOOL kill_system_timer( HWND hwnd, UINT_PTR id )
{
    BOOL ret;

    SERVER_START_REQ( kill_win_timer )
    {
        req->win = wine_server_user_handle( hwnd );
        req->msg = WM_SYSTIMER;
        req->id  = id;
        ret = !wine_server_call_err( req );
    }
    SERVER_END_REQ;
    return ret;
}

static BOOL send_window_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam,
                                 LRESULT *result, BOOL ansi )
{
    /* FIXME: move implementation from user32 */
    if (!user_callbacks) return FALSE;
    *result = ansi
        ? user_callbacks->pSendMessageA( hwnd, msg, wparam, lparam )
        : user_callbacks->pSendMessageW( hwnd, msg, wparam, lparam );
    return TRUE;
}

/* see SendMessageW */
LRESULT send_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
{
    LRESULT result = 0;
    send_window_message( hwnd, msg, wparam, lparam, &result, FALSE );
    return result;
}

/* see SendNotifyMessageW */
static BOOL send_notify_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam, BOOL ansi )
{
    return user_callbacks && user_callbacks->pSendNotifyMessageW( hwnd, msg, wparam, lparam );
}

/* see PostMessageW */
LRESULT post_message( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
{
    /* FIXME: move implementation from user32 */
    if (!user_callbacks) return 0;
    return user_callbacks->pPostMessageW( hwnd, msg, wparam, lparam );
}

BOOL WINAPI NtUserMessageCall( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam,
                               ULONG_PTR result_info, DWORD type, BOOL ansi )
{
    switch (type)
    {
    case FNID_CALLWNDPROC:
        return init_win_proc_params( (struct win_proc_params *)result_info, hwnd, msg,
                                     wparam, lparam, ansi );
    case FNID_SENDMESSAGE:
        return send_window_message( hwnd, msg, wparam, lparam, (LRESULT *)result_info, ansi );
    case FNID_SENDNOTIFYMESSAGE:
        return send_notify_message( hwnd, msg, wparam, lparam, ansi );
    case FNID_SPYENTER:
        spy_enter_message( ansi, hwnd, msg, wparam, lparam );
        return 0;
    case FNID_SPYEXIT:
        spy_exit_message( ansi, hwnd, msg, result_info, wparam, lparam );
        return 0;
    default:
        FIXME( "%p %x %lx %lx %lx %x %x\n", hwnd, msg, wparam, lparam, result_info, type, ansi );
    }
    return 0;
}