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Auto-close message box

By , 23 Jul 2007
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Introduction

This article describes a simple solution for automatically closing a message box. I have looked at many similar articles in the Inetrnet which are quite complex, so I thought I would make this one a little more simple.

Understanding the CMsgBox class

CMsgBox is a class which implements auto-close functionality. This class is derived from the CWnd class. It exposes a method called "MessageBox()", which in turn would call CWnd::MessageBox() to display a message box.

Getting the auto-close functionality implemented is very simple. In the CMsgBox::MessageBox() method, we start a timer (SetTimer() method) just before we call the CWnd::MessageBox API. In the OnTimer method, we try to find the message box window by using its window name (caption). Once found, we post a WM_CLOSE message to close the message box. That's it !

void CMsgBox::MessageBox(CString sMsg, CString sCaption, UINT nSleep, 
                         UINT nFlags, bool bAutoClose)
{
    // Save the caption, for finding this 
    // message box window later

    m_Caption = sCaption;  

    // If auto close then, start the timer.

    if(bAutoClose)
        SetTimer(100, nSleep, NULL);

    // Show the message box

    CWnd::MessageBox(sMsg, sCaption, nFlags);
}

void CMsgBox::OnTimer(UINT nIDEvent) 
{
    // TODO: Add your message handler code here and/or call default

    BOOL bRetVal = false;

    // Find the message box window using the caption

    CWnd* pWnd = FindWindow(NULL, m_Caption);
    if(pWnd != NULL)
    {
        // Send close command to the message box window

        ::PostMessage(pWnd->m_hWnd, WM_CLOSE, 0, 0);
    }

    // Kill the timer

    KillTimer(100);

    CWnd::OnTimer(nIDEvent);
}

Using the code

Add these two files to your project: "MsgBox.cpp" and "MsgBox.h". #include "MsgBox.h" wherever appropriate. Create the CMsgBox object as:

CMsgBox obj(this);

Or like this:

CMsgBox obj;
obj.SetParent(this);

Use the MessageBox() method for displaying the message box. Set the bAutoClose parameter to false if you don't need the auto-close functionality.

obj.MessageBox("This message box will auto close in 2 seconds.", 
               "Auto Close Msg Box", 2000, MB_OK | MB_ICONINFORMATION);

Conclusion

Wasn't that simple? Also, this being my first post, please forgive me for any mistakes.

References

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

thammadi
Software Developer (Senior)
India India
Sandeep completed his masters in Computer Applications in 2003 and has been hooked onto programming since then. His first project involved communicating with hardware devices which actually got him more interested in device programming.

Comments and Discussions

 
QuestionStatic AutoClose MessageBox PinmemberClive Haskins7-Aug-12 2:08 
GeneralNice work! PinmemberDaniel Vlasceanu1-Aug-07 0:20 
GeneralRe: Nice work! Pinmembermelwyn5-Aug-07 9:41 
GeneralMy implementaion Pinmembermelwyn30-Jul-07 8:43 
GeneralRe: My implementaion Pinmemberryltsov5-Aug-07 6:54 
GeneralFeature request PinmemberRavi Bhavnani24-Jul-07 2:24 
It would be nice if you could provide a way to retrieve the return value from the internal MessageBox() call. In its current form, the class is useful only for message boxes displayed using MB_OK, where the return value is always IDOK.
 
The caller should also be able to specify the default return value that will be used if the message box autocloses.
 
Thanks,
 
/ravi
 
This is your brain on Celcius
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

GeneralRe: Feature request Pinmemberthammadi24-Jul-07 19:54 
GeneralNice! PinmemberRavi Bhavnani24-Jul-07 2:19 
GeneralLooks useful! PinmvpHans Dietrich23-Jul-07 23:05 
GeneralRe: Looks useful! Pinmemberthammadi24-Jul-07 0:39 

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