?
Solved

Escape key

Posted on 1999-01-01
6
Medium Priority
?
737 Views
Last Modified: 2013-11-20
Also, in my program, the {Esc} key will exit it.  I do not want this to happen.  I want the escape key to do nothing.  What can I do to disable this stupid escape key?
0
Comment
Question by:abc021397
6 Comments
 
LVL 6

Accepted Solution

by:
thresher_shark earned 400 total points
ID: 1327115
To solve this problem, you want to override the OnCancel member function.  Here is what you want to do:
1) Open up your dialog header file, named something like CMyDlg.h
2) Add:
   void OnCancel ();
   somewhere in the "public:" area.
3) Open up your dialog source code file, named something like CMyDlg.cpp
4) Add:
   void CMyDlg::OnCancel ()
   {
   }
   to the end of the file.
5) Recompile
6) Run and voila! No more escape key exiting.

If you have any further questions on how to implement this or are having any other difficulty, please feel free to ask.  Thanks!
0
 
LVL 4

Expert Comment

by:pagladasu
ID: 1327116
thresh,
Now suppose there is the Cancel command button with the ID value of IDCANCEL. OnCancel will be mapped to the clicked event of this button. Now overriding the OnCancel will not only disable the Escape key but will also prevent the user from exiting if the Cancel button is clicked. How about only disabling the escape key?

0
 
LVL 1

Expert Comment

by:dd_b
ID: 1327117
overridding OnCancel may create a problem while exiting on Cancel Button.

The Best way is in OnKeyDown

afx_msg void OnKeyDown( UINT nChar, UINT nRepCnt, UINT nFlags );
{
//compare

if ( nChar == VK_ESCAPE )
   return;
else

BaseClass::OnKeyDown

}

0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
LVL 6

Expert Comment

by:thresher_shark
ID: 1327118
Thank you dd_b for providing the code.  Here it was night time which is why I did not respond sooner.

abc - If you can use either method to cancel the esc key's effect.  As has been shown, the second method is better.
0
 
LVL 1

Expert Comment

by:The_Brain
ID: 1327119
NOO not OnKeyDown

PreTranslateMessage(MSG pMsg)
{
   if (GetAsyncKeyState(VK_ESCAPE))
     {
        do what you wan't to do to kill the button;
        I would probably say
        VK_ESCAPE=0;
     }
     
}

Don't use OnKeyDown.  It sometimes for some odd reason doesn't capture keys.
0
 
LVL 4

Expert Comment

by:pagladasu
ID: 1327120
The_Brain, you're right. There are times when OnKeyDown will not work. I think PreTranslateMessage will work.
However as suggested by you VK_ESCAPE=0 will not work. VK_ESCAPE is already a predefined constant. You cannot change its value.


0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I'll describe -- and show pictures of -- some of the significant additions that have been made available to programmers in the MFC Feature Pack for Visual C++ 2008.  These same feature are in the MFC libraries that come with Visual …
Have you tried to learn about Unicode, UTF-8, and multibyte text encoding and all the articles are just too "academic" or too technical? This article aims to make the whole topic easy for just about anyone to understand.
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.
This video shows how to quickly and easily deploy an email signature for all users in Office 365 and prevent it from being added to replies and forwards. (the resulting signature is applied on the server level in Exchange Online) The email signat…
Suggested Courses

864 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