Solved

How to use the OnKeyDown() of a CEdit control?

Posted on 2003-12-01
2
2,097 Views
Last Modified: 2013-11-20
Hi,
I want to trap the Arrow Keys and the Enter key in a CEdit control.
I used the sample from MSDN:
http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q104/6/37.asp&NoWebContent=1

So I have a custom CMyEdit class with an overloaded OnKeyDown() function.
I added a CMyEdit control called mMyEdit in my dialog called CMyDlg.

Now I want to add code in CMyDlg to handle the event when I trap an Arrow Key. The function itself should look something like this:

void CMyDlg::OnMyEditKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
   // my code here
}

So how do I add such an event?
Thanks!
0
Comment
Question by:benhere
2 Comments
 
LVL 23

Accepted Solution

by:
Roshan Davis earned 500 total points
ID: 9855481
1. In your derived EDIT class map the WM_KEYDOWN.
2. And in that routine OnKeyDown post a message to the parent like thos

#define WM_MY_EDITKEY_DOWM WM_USER+1200


void CMyEdit::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
      CWnd *pWnd = GetParent();
      
      if ( pWnd )
            pWnd->PostMessage(WM_MY_EDITKEY_DOWM, nChar, MAKELPARAM(nRepCnt,nFlags));

      CEdit::OnMyEditKeyDown(nChar, nRepCnt, nFlags);
}

3. And in your CMyDlg, map the message WM_MY_EDITKEY_DOWM

BEGIN_MESSAGE_MAP(CUpdateXMLDlg, CDialog)
      //{{AFX_MSG_MAP(CUpdateXMLDlg)
      // Class wizard message mapping
      //}}AFX_MSG_MAP
      ON_MESSAGE(WM_MY_EDITKEY_DOWM, OnMyEditKeyDown)
END_MESSAGE_MAP()

and in your header
agx_msg void OnMyEditKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);

4. Place the definition of the function in CPP

Good Luck
0
 
LVL 2

Author Comment

by:benhere
ID: 9862135
Thanks, it works! :-)

I just had to change a few details:


Change this:
CEdit::OnMyEditKeyDown(nChar, nRepCnt, nFlags);

To this:
CEdit::OnKeyDown(nChar, nRepCnt, nFlags);


Change this:
agx_msg void OnMyEditKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);

To this:
afx_msg long OnMyEditKeyDown(WPARAM wParam, LPARAM lParam);


And my functions looks something like this:

long CMyDlg::OnMyEditKeyDown(WPARAM wParam, LPARAM lParam)
{
   UINT lChar = (UINT)wParam;

   //Check if the key pressed was a DOWN ARROW key
   if( lChar == VK_DOWN )
   {
      AfxMessageBox("It is a down arrow key!");
   }

   return 1;
}

0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

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 …
Introduction: Displaying information on the statusbar.   Continuing from the third article about sudoku.   Open the project in visual studio. Status bar – let’s display the timestamp there.  We need to get the timestamp from the document s…
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.
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

733 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