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

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  • Your email address will not be published.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

Top White Papers and Webcasts

  • You probably have several goals for your patient portal of choice. Is "community" one of them? With a bevy of vendors offering portal solutions, it can be challenging for a hospital to know where to start. Fortunately, YourCareCommunity helps ease the decision-making process. Read this white paper to learn more. "3 Ways Clinicians can Leverage a Patient Portal to Craft a Healthcare Community" is a published document owned by www.medhost.com

  • Download the Information Governance Survey Benchmark Report to gain insights that can help you further establish business value in your Records and Information Management (RIM) program and across your entire organization. Discover how your peers in the industry are dealing with this evolving information lifecycle management environment and uncover key insights such as: 87% of organizations surveyed have a RIM program in place 8% measure compliance 64% cannot get employees to "let go" of information for …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds