MFC implements the edit input limit (only allow input numbers, minus and decimal points)

1) Add a C + + class eg. Class Dot:public CEdit

2) Add OnChar () message to this class

afx_msg void OnChar (UINT NChar, uint nrepcnt, uint nflags);

3) in *.cpp

void Dot::onchar (UINT NChar, uint nrepcnt, uint nflags)
{
Todo:add your message handler code here and/or call default
Ensure that the decimal point can occur at most once
if (nchar== '. ')
{
CString str;
Gets the string in the original edit box
GetWindowText (str);
If there is already a decimal point in the original string, it is not entered, guaranteeing that you can enter at most one decimal point
if (str. Find ('. ')! =-1)
{
}
Otherwise, enter the decimal point.
Else
{
Cedit::onchar (NChar, nrepcnt, nflags);
}
}
Ensure that the minus sign appears only once, and can only appear in the first character
else if (nchar== '-')
{
CString str;
GetWindowText (str);
No strings entered yet
if (str. IsEmpty ())
{
Cedit::onchar (NChar, nrepcnt, nflags);
}
Else
{
int nsource,ndestination;
GetSel (nsource,ndestination);
All content is selected at this time
if (nsource==0&&ndestination==str. GetLength ())
{
Cedit::onchar (NChar, nrepcnt, nflags);
}
Else
{
}
}
}
In addition to the decimal and minus signs, the number is also allowed, backspace,delete
else if ((nchar>= ' 0 ' && nchar<= ' 9 ') | | (nchar==0x08) | | (nchar==0x10))
{
Cedit::onchar (NChar, nrepcnt, nflags);
}
None of the other keys are responding
Else
{
}
}

4) in *dlg.h Plus

----#include "Dot.h"

----"Dot m_s;

5) in *dlg.cpp Plus

-----"DDX_Control (PDX, idc_edit1, m_s);

Or

BOOL cweixinq::P retranslatemessage (msg* pMsg) {//TODO: Add private code here and/or call base class//Specify dialog box to accept numeric key input only, other symbol input invalid//Get control window pointer CEdit
	* pEdit1 = (cedit*) GetDlgItem (Idc_edit1_q_money);
    cedit* pEdit2 = (cedit*) GetDlgItem (Idc_edit2_q_code); if ((getfocus () = = PEdit1 | |
		GetFocus () = = PEdit2) && (pmsg->message = = Wm_char)) {//Allow only numbers and decimal points to be entered. " 
		if ((Pmsg->wparam <= ' 9 ' && pmsg->wparam >= ' 0 ') | | pmsg->wparam = = '. ')
			The {//Amount input box only allows you to enter a decimal if (Pmsg->wparam = = '. ')
				{CString str;
				int nPos = 0; GetDlgItemText (Idc_edit1_q_money, str); Get edit chinese text nPos = str.	Find ('. ');
				Find the location of the IF (NPos >= 0) {return 1;
			
		}} return 0;
		} else if (Pmsg->wparam = = 0x08 | | pmsg->wparam = = 0x10)//accept backspace and delete key {return 0; } else {//Response tab Switch shortcut key switch (pmsg->wparam) {case ' Q ': Case ' Q ': Case ' W ': Case ' W ': Case ' E ': Case ' e ': Case ' r ': Case ' r ': case ' t ': Case ' t ': Case ' y ': Case ' y ': Case ' u ': Case ' u ': Case ' I ': Case ' I ': Case ' o ': Case ' o ':
				CWnd *pparent = GetParent ();
			Pparent->setfocus ();
		} return 1;
}} return CDialogEx::P retranslatemessage (PMSG); }