MFC - Remove leading zeros for CEdit number control - c++

Question

I find that CEdit control has option 'Number' in its property, so that I can prevent user from enter non-digit character into this textbox - it is CEdit number control now.
If there is an option 'Number', I think maybe there is a way to remove leading zeros for CEdit which is just simple like option 'Number'.
I have tried Dialog Data Exchange with hope that it would remove leading zeros for me automatically, but it won't.
Then I think the way to do this is add EN_KILLFOCUS message for each of the CEdit number controls, but I find that exhausted.
So I think the better way to do that is add EN_KILLFOCUS, but all the CEdit number controls lose focus event point to one function, in this function I'll remove leading zero for the 'current' control, but in C# I can get the 'current' control, in C++ I don't know if it's supported.
Or inherit CEdit to make CEditNum - which implement lose focus remove leading zeros feature, but with this solution, I can't design it on the Visual Studio design window (I think). I hope there is a solution similar to this solution (which is a solution for Draw&Drop problem)
Anyway, before apply the final solution (EN_KILLFOCUS), I want to make sure if is there better way - least implement, reuse the existing implement of MFC.
A little explain about remove leading zeros: you enter: 00001 into the CEdit control, then lose focus, the CEdit control show you: 1. The idea is like MS Excel when you enter a number into its cell.

Answer 1

"but all the CEdit number controls lose focus event point to one function"
That is true, but you get the control ID of the control that's just lost focus as a parameter.
Add this to your Message table, replace IDC_FIRST, IDC_LAST with the first and last IDs of your edit controls, or use 0, 0xFFFFFFFF for all.
ON_CONTROL_RANGE(EN_KILLFOCUS, IDC_FIRST, IDC_LAST, OnKillFocus).
Here is the signature of OnKillFocus, and how to get a CWnd to apply changes.
void CMyDialogClass::OnKillFocus(UINT nID)
{
// you can further check if the ID is one of interest here...
// if your edit control control IDs are not contiguous, for example.
// you can get a CEdit* here, but only if you used DDX to map the
// control to a CEdit.
CWnd* pCtrl = GetDlgItem(nID);
if (pCtrl)
{
CString str;
pCtrl->GetWindowText(str);
// remove zeroes, or format as you like....
str.Format(_T("%d"), _tcstoi(str));
pCtrl->SetWindowText(str);
}
}
// if you mapped the control to a CEdit, here's how you can safely
// get a pointer to a CEDit
CEdit* pEdit = (CEdit*)GetDlgItem(nID);
ASSERT_KINDOF(CEdit, pEdit); // debug check
if (pEdit && pEdit->IsKindOf(RUNTIME_CLASS(CEdit))) // standard check
{
// ....
}