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  • Your email address will not be published.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

  • Today, users, applications, and data exist in more places than ever before, creating an unprecedented challenge for IT. How can IT achieve the flexibility and agility it needs to offer multiple types of applications in multiple locations? To better serve business demands for information everywhere, enterprises must develop new strategies for optimizing multiple kinds of networks. Read this white paper to learn how hybrid networks provide an unprecedented level of network dynamism, enterprise agility, and the …

  • Genesys has been able to apply the best of all strategic approaches in moving to the cloud. It has acquired assets to bypass the long R&D process required to build from scratch, yet skillfully planned a phased integration to provide customers with functionality they need quickly. It also has followed an aggressive development plan to deliver multiple releases per quarter to continue to enrich its cloud offerings for customers. For these reasons, Frost & Sullivan is pleased to present Genesys with the 2014 …

Most Popular Programming Stories

More for Developers

RSS Feeds

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