MFC edit box control only enter decimals, and control the number of decimal places, the number of digits, the value

Effect

Key code

void Cdecimaledit::onchar (UINT NChar, uint nrepcnt, uint nflags) {//Todo:add your message Handler co De here and/or call default///guarantee that the decimal point can only occur once if ((nchar==0x08) | | (nchar==0x10)) 
	, Backspace,delete {Cedit::onchar (NChar, nrepcnt, nflags);

	} CString str;
	Gets the string GetWindowText (str) in the original edit box; int len = str.
	GetLength ();
	if (Len >=) {return;
	} if (nchar== '. ') {///Wakahara has a decimal point in the string, it is not entered so that you can enter at most one decimal if (str). Find ('. ')! 
		=-1) {}//otherwise enter this decimal dot else {Cedit::onchar (NChar, nrepcnt, nflags);
	} return; 
	}//Except the decimal point, also allows the input number if ((nchar>= ' 0 ' && nchar<= ' 9 ')) {Cedit::onchar (NChar, nrepcnt, nflags);
	}//Other keys do not respond to else {} getwindowtext (str); Len = str.
	GetLength ();
		if (len >=) {checkwidth (str);
	Return
		} if (Atoi (str) > 4000000) {AfxMessageBox ("the maximum value must not exceed 4000000");
		SetWindowText ("");
	Return	


	} checkwidth (str);
Return }

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