Window is not closing by clicking close icon in dialog in VC++

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Hi, can somebody tell why the window is not closing by clicking close icon in title bar?

Posted 13-Apr-11 1:42am

bunathangaraj

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3 solutions

Solution 2

Probably because the message handler is missing for the dialog.

Have a look here:
Windows Message Handling - Part 1[^]

Good luck!

Posted 13-Apr-11 1:46am

E.F. Nijboer

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Hans Dietrich 13-Apr-11 7:55am

If the message map entry or message handler is missing, it would be passed to default handler, which would close it.

E.F. Nijboer 13-Apr-11 8:11am

Correct, there is a message handler but this prevents the dialog from closing because the WM_CLOSE isn't handled properly.

Hans Dietrich 13-Apr-11 8:13am

Exactly, which is what I said in my Solution 1.

Sergey Alexandrovich Kryukov 13-Apr-11 8:31am

For MFC? Right, my 5.
--SA

Solution 3

There are a few ways to close windows:
1) Modal dialog: handle WM_CLOSE or WM_COMMAND and close the window by calling EndDialog.
2) Modeless windows (popup or overlapped) handle the WM_CLOSE message by DestroyWindow.
3) Application windows: handle the WM_CLOSE or any command by DestroyWindow and handle the WM_DESTROY by PostQuitMessage to end the message loop.
Regards.

Posted 14-Apr-11 5:03am

mbue

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Hans Dietrich · Accepted Answer · 2011-04-13T01:45:00

Solution 1

You have overridden WM_CLOSE (or Onclose) and prevent the default message handling.

Posted 13-Apr-11 1:45am

Hans Dietrich

Comments

Sergey Alexandrovich Kryukov 13-Apr-11 8:31am

And this advice can be used even for raw Windows code, my 5.
Teamwork!
--SA

Albert Holguin 13-Apr-11 10:26am

another thing that may cause this is overriding message handling methods (that affect all messages instead of just WM_CLOSE).... good answer though, my 5