Conditionally allow creation of new Child Frames in an MDI application using MFC

Posted on 2004-04-15
Medium Priority
Last Modified: 2013-11-20

I have written an MDI application using Visual C++ and MFC 6 with Doc/View support. The UI is like this: MDI App with each Child Frame divided into 2 Views with a SplitterWnd, first one a CEditView derived class where the user can enter any Sql query. Second, a CView derived class where the results of the query are displayed in a child Grid control which resizes fully to cover the parent view. This is what I want to accomplish:

When the user chooses File->New (CWinApp::OnFileNew()), I want to present a modal dialog with UserName,Password and a list of valid Dsn's. If the connection is succussfully, allow the framework to create the new child frame with the 2 Views, if he clicks cancel, the new child frame with the 2 views should not be created. I have created the dialog and tested it, no issues there.

I want to know where to put code so that the I can stop the MFC architechture from creating the new child frame when the validation fails. Please help me out in this regard.


Question by:BalajiS
  • 2
LVL 48

Accepted Solution

AlexFM earned 500 total points
ID: 10831016
In MDI application created by MFC Application Wizard there is the following line:


in the application class message map. You need to provide your own message handler:

afx_msg void OnMyFileNew( );      // in h-file

ON_COMMAND(ID_FILE_NEW, OnMyFileNew)        // in message map, instead of ON_COMMAND(ID_FILE_NEW, OnFileNew)


void CMyApp::OnMyFileNew()
    // Show dialog here
    // If succeeded, call CWinApp::OnFileNew();
    // which actually creates new frame


Author Comment

ID: 10841154
Thanks a lot for your valuable suggestion. I did the same for OnFileOpen and it works fine.

The only issue remaining is that how do I tackle MRU menu items. I understand MFC uses a pre-wired handler for ID_FILE_MRU_1 and opens the document dyanmically from the selection. Can I handle this too ?


Author Comment

ID: 11124126
That's ok, you can close the question. I have been able to solve it completely.



Featured Post

Train for your Pen Testing Engineer Certification

Enroll today in this bundle of courses to gain experience in the logistics of pen testing, Linux fundamentals, vulnerability assessments, detecting live systems, and more! This series, valued at $3,000, is free for Premium members, Team Accounts, and Qualified Experts.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Through the video, you can check the migration process of Outlook PST file to PDF. Kernel for Outlook to PDF tool can convert Outlook emails with all attributes like Subject, To, From, Cc, Bcc and other folders such as Inbox, Outbox, Sent Items, Jun…

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question