isnumber.cpp

光学仪器的控制系统 用于教学和科研的仪器

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop

#include "IsNumber.h"

//---------------------------------------------------------------------------
#pragma package(smart_init)

AnsiString IsNumber(AnsiString Str)
{//判断Str里是否有不是'0'~'9'的字符,
 //如果有将其删除并返回删除后的Str
 char c;
 bool bDot;
 bool bPlus;
 bool bMinu;
 bool bDel;
 int len;
 AnsiString strTemp;

 len=Str.Length();;

 if(Str.IsEmpty())
 {
  //Str="0";
  return Str;
 }

 bDot = false;
 bPlus = false;
 bMinu = false;
 bDel = false;
 strTemp = "";
 for(int i=0;i<len;i++)
 {
     c=Str.c_str()[i];
     bDel = false;
     switch(c)
     {
         case '0':    case '1':       case '2':      case '3':
         case '4':    case '5':       case '6':      case '7':
         case '8':    case '9': break;
         case '.':
                    if(bDot) bDel = true;
                    else     bDot = true;
                    break;
         case '+':
                    if(bPlus || i != 0) bDel = true;
                    else     bPlus = true;
                    break;
         case '-':
                    if(bMinu || i != 0) bDel = true;
                    else     bMinu = true;
                    break;
         default:   bDel = true; break;
     }
     if(bDel)
     {

         //Str.Delete(i+1,1);
         MessageBeep(0xffffffff);

     }
     else
     {
         strTemp += c;
     }
 }
 return strTemp;
}


bool IsFloat(AnsiString Str)
{
/*
    float fVal;

    if(Str == IsNumber(Str) && Str != "") return true;
    else return false;
*/

    float fVal;
    try
    {
        if(Str == "") return false;
        if(Str == ".") return false;
        if(Str == "+.") return false;
        if(Str == "-.") return false;

        fVal = Str.ToDouble();
    }
    catch(...)
    {
        return false;
    }
    return true;

}