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Articles / Desktop Programming / MFC
Posted 9 Nov 2000


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A thread-safe timed message box

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3.43/5 (4 votes)
12 Feb 2001
The system Message Box that is closed atuomatically after some time

What is the code for

This is for using the systems MessageBox (no extra dialog creation needed). After a time with no user-response the dialog is automatically closed. An optional text showing the time left to interact is provided. It's also a replacement for MSDN Q181934 (doesn't work)


Before calling MessageBox, a timer is installed. In the timer's callback-procedure the message-text from the box is replaced (optional).

When the box should be closed, a WM_COMMAND is posted to the MessageBox Window.


I decided to collect all the information corresponding to the MessageBox (title, Message, Flags ...) in a class. Then there is the problem that only a static timer-callback-procedure can be installed with the SetTimer()-function: one can not access the class-members (as it is static).

To solve this problem, I inserted a Map to store the classes corresponding to a timer-id:


class CDlgTimedMessageBox
    // ...
    UINT         ShowMessageBox(BOOL *pbStoppedByUser=NULL);
    // ...
    static void  CALLBACK GlobalTimerProc(HWND hwnd, UINT uiMsg, 
                                          UINT idEvent, DWORD dwTime);
    void         LocalTimerProc(void);
    // ...
    static       CMapPtrToPtr        m_mapTimerIdToClassMe;

    // to call the messagebox within one line !
    static UINT  TimedMessageBox(...);

    UINT         m_idTimer;


UINT CDlgTimedMessageBox::ShowMessageBox(BOOL *pbStoppedByUser)
    // ...
    m_idTimer = ::SetTimer(NULL, 0, 1000, 
                    (TIMERPROC) CDlgTimedMessageBox::GlobalTimerProc);
    // ...
    // ...

void CALLBACK CDlgTimedMessageBox::GlobalTimerProc(HWND hwnd, 
                               UINT uiMsg, UINT idEvent, DWORD dwTime)
    CDlgTimedMessageBox    *pMe = NULL;
    // Find the corresponding class by the timer-id
                                                       (void *&) pMe);
    if( pMe!=NULL )

void CDlgTimedMessageBox::LocalTimerProc(void)
    // find the Message-Box-window

    // Calculate time since start
    if( too long running )
        // Stop MessageBox
        // replace text of MessageBox    

Finding the MessageBox

hWnd = ::GetWindow(::GetDesktopWindow(), GW_CHILD);
while( (hWnd!=NULL) && (m_hMsgBox==NULL) )
    pWnd = CWnd::FromHandle(hWnd);

    if( AfxIsDescendant(m_hParent, hWnd) && ::IsWindowVisible(hWnd) && 
        (m_Title.CompareNoCase(title)==0) )
        m_hMsgBox = hWnd;
    hWnd = ::GetWindow(hWnd, GW_HWNDNEXT);


Put it in one function

There is one function you can use to call the messagebox without creating a class-instance: CDlgTimedMessageBox::TimedMessageBox() does the rest for you!

UINT CDlgTimedMessageBox::TimedMessageBox(UINT flags, LPCTSTR ptszMessage, 
                          LPCTSTR ptszTitle, 
                          DWORD dwTimeout, UINT dDefaultReturn,
                          LPCTSTR ptszMessageTimer, HWND hwndParent, 
                          BOOL *pbStoppedByUser)
    CDlgTimedMessageBox    msgBox(flags, ptszMessage, ptszTitle, 
                                  dwTimeout, dDefaultReturn, 
                                  ptszMessageTimer, hwndParent);

    return msgBox.ShowMessageBox(pbStoppedByUser);

You can pass a BOOL * to get the info, if the user has pressed a button.



The map-access is enclosed by a CCriticalSection.


BOOL	stoppedByUser;
UINT	erg;

erg  = CDlgTimedMessageBox::TimedMessageBox(MB_YESNO|MB_ICONHAND, 
		"Please press a button", 
		5000, IDYES, 
		"\nin the next %lu sec !", 
		NULL, &stoppedByUser);


5.11.2000     posted to Code Project
14.11.2000   bugfixes for NT4
05.02.2001   bug reported when created with MBYES: defbutton then is IDCANCEL
05.02.2001   global function went to class-scope


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Comments and Discussions

GeneralMy vote of 1 Pin
Sudhindra Sathya19-Nov-10 1:26
MemberSudhindra Sathya19-Nov-10 1:26 
QuestionHow to show other icons in the messagebox.. Pin
Jigar Mehta23-Nov-04 20:48
MemberJigar Mehta23-Nov-04 20:48 
I want to information icon and error icon in the messagebox, so which constants should I use.. Please enumerate the constants in your articles... to help people effectively use it...

Thanks for a great class..

Rose | [Rose]

Jigar Mehta

Software Developer
Gates Information Systems
GeneralCompiling errors Pin
FlyingDancer7-Oct-03 21:11
MemberFlyingDancer7-Oct-03 21:11 
GeneralRe: Compiling errors Pin
cristitomi21-Mar-07 6:35
Membercristitomi21-Mar-07 6:35 
Generaltimed out MessageBox Pin
Xeena2-Oct-02 6:53
MemberXeena2-Oct-02 6:53 
Generalbottons Pin
17-Jun-02 5:29
suss17-Jun-02 5:29 
GeneralIf you like this then.... Pin
12-Mar-02 7:23
suss12-Mar-02 7:23 
General"Fire and Forget" addition Pin
M.Lansdaal12-Feb-02 14:53
MemberM.Lansdaal12-Feb-02 14:53 
GeneralTimer Pin
12-Nov-01 2:59
suss12-Nov-01 2:59 
GeneralRe: Timer Pin
mloibl12-Nov-01 21:10
Membermloibl12-Nov-01 21:10 
GeneralRe: Timer Pin
22-Nov-01 5:04
suss22-Nov-01 5:04 
GeneralMemory Leaks Pin
eljkmw22-Aug-01 17:53
Membereljkmw22-Aug-01 17:53 
GeneralRe: Memory Leaks Pin
Alan Adams28-Oct-04 11:04
MemberAlan Adams28-Oct-04 11:04 
QuestionHOW? Pin
6-Jul-01 7:00
suss6-Jul-01 7:00 
AnswerRe: HOW? Pin
mloibl17-Jul-01 20:50
Membermloibl17-Jul-01 20:50 
GeneralMissing include Pin
6-Jul-01 4:52
suss6-Jul-01 4:52 
GeneralAlways on top Pin
22-Jun-01 3:20
suss22-Jun-01 3:20 
GeneralRe: Always on top Pin
mloibl17-Jul-01 20:56
Membermloibl17-Jul-01 20:56 
QuestionAfxIsDescendant() ? Pin
Peter Sjöström28-Mar-01 5:58
MemberPeter Sjöström28-Mar-01 5:58 
AnswerRe: AfxIsDescendant() ? Pin
mloibl28-Mar-01 20:10
Membermloibl28-Mar-01 20:10 
AnswerRe: AfxIsDescendant() ? Pin
Wes Jones17-Jul-01 13:19
MemberWes Jones17-Jul-01 13:19 
GeneralIcky global functions! Pin
Paul Wolfensberger17-Nov-00 4:15
MemberPaul Wolfensberger17-Nov-00 4:15 
GeneralRe: Icky global functions! Pin
mloibl5-Feb-01 3:51
Membermloibl5-Feb-01 3:51 
GeneralRe: Icky global functions! Pin
mloibl5-Feb-01 9:13
Membermloibl5-Feb-01 9:13 
GeneralCrashes immediately on NT4 Pin
13-Nov-00 1:40
suss13-Nov-00 1:40 

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