Cancel Child Window in MDI VS2013 VC++ App

Posted on 2013-11-28
Last Modified: 2013-11-30
I have a MDI application that on startup and on FILE->New creates a CDialog.  If the user clicks on CANCEL it creates an empty child.  I would like for

Cancel on the first document, close the whole program.

Cancel on subsequent documents, simply not create a child window.

My CDialog is created in OnInitialUpdate() but can be anyplace that makes sense.

Thanks in advance.
Question by:rickhill11
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LVL 34

Accepted Solution

sarabande earned 500 total points
ID: 39684824
an mdi child window (what is a frame window) normally would have a non-modal) formview rather than a modal dialog. The OnInitialUpdate is a CView member function. i assume you have a DoModal call directly in OnInitialUpdate. if so, you would check for the return code of the DoModal. if it is IDCANCEL you could send GetParent().PostMessage(WM_CLOSE, 0, 0); to close the current view, document and frame (mdi child).

LVL 34

Expert Comment

ID: 39684825
should be

GetParent()->PostMessage(WM_CLOSE, 0, 0); 

Open in new window


Author Comment

ID: 39685193
Thanks, it worked perfectly.  I was using SendMessage() in essentially the same way, but it kept blowing up.  It never even occurred to me to try PostMessage().

Thanks again!

Author Closing Comment

ID: 39685197
Thanks, it worked perfectly.  I was using SendMessage() in essentially the same way, but it kept blowing up.  It never even occurred to me to try PostMessage().

Thanks again!
LVL 34

Expert Comment

ID: 39687650
the PostMessage puts the WM_CLOSE at end of message queue. the SendMessage would be handled immediately and would destroy and delete the current window(s) and objects including the one where you called SendMessage.

alternatively to PostMessage call to the frame window you may try to calling GetDocument()->OnCloseDocument();


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