Simple Numeric Edit Control

-->

In our application we needed several edit controls to accept only numbers. One might think to use the Number option on the resource editor, but unfortunately that did not allow us to enter the "-" minus sign. So we needed a different solution.

We looked at CodeGuru to find a simple MaskEdit control. There were several to choose from but unfortunately they all did much more that we needed, and the cursor movement, backspace and delete were not exactly the same as the standard edit control (which was a requirement). With nothing else to do, we (like so many others other there) simply wrote our own.

It was unbelievably simple. Here are the steps we took:

1: Created a new class using class wizard where the base class was CEdit. 2: Added this handler for WM_CHAR

void MaskEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
 CString Holder =
  "`~!@#$%^&*()_+|=\\qwertyuiop[]asdfghjkl;'zxcvbnm,./QWERTYUIOP{}ASDFGHJKL:/\"
  "ZXCVBNM<>/";

 if(Holder.Find(nChar)!=-1)
  return;

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

That's it. No it does not check for every possibility in the world, but it does exactly what we needed. It allows us to have an edit control that works exactly like the default, but only allows numbers and the "-" sign. There is probably a more elegant way we could have done this, but this was fast, and it worked.



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • The future of cloud platforms is at hand. Even if your cloud applications are basic now, your next set of apps will require strong analytics services and tools, as well as features that ease enterprise integration. To fill these needs, consider using not only your current cloud provider but also specialists. Take advantage of not only the big cloud platforms, but also specialized providers in vertical industries; countries and regions; and functional domains including omnichannel, analytics, integration, and …

  • Featuring Kate Leggett, VP and Principal Analyst, Forrester Research Live Event Date: October 19, 2016 @ 10 AM PT / 1 PM ET Omnichannel self-service is the new paradigm. Firms are organizing to provide self-service options across all channels in order to meet customer needs and expectations—going beyond traditional IVR. Are you prepared to offer your customers personalized self-service across all channels including legacy applications like your IVR?

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date