Simple Numeric Edit Control

WEBINAR: On-demand webcast

How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >

-->

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  • Your email address will not be published.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

  • Read the ebook Hybrid Cloud & Data Fabric for Dummies to learn how a Data Fabric can ease data management complexity within a hybrid cloud and help you maximize the control of your data — from anywhere at any time. Find out how to: Seamlessly and dynamically move data across private and public cloud resources Keep data secure and minimize business disruptions …

  • Chuze Fitness is a fast-growing fitness chain with over 21 locations spanning California, Arizona and Colorado. Chief information and marketing officer, Kris Peterson, explains why access to fast and reliable Wi-Fi is a "must have" service at their gyms and why they switched to Ruckus Cloud Wi-Fi. Chuze Fitness needed to provide a good user experience to the hundreds of guests streaming music, podcasts and videos as they worked out. They also needed to adequately cover their sprawling 20-40,000 square foot …

Most Popular Programming Stories

More for Developers

RSS Feeds

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