using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CommService
{
    /*
     *类名称：Utility
     *创建人：韩荣伟
     *创建时间：2010-10-30
     *功能描述：工具类
     */

    class Utility
    {
        /*
         *方法名称：floatStringToBCD
         *创建人：韩荣伟
         *创建时间：2010-10-30
         *参数描述：string sFloat 待转换的浮点数字符串,
         *int nIntSize 整数位数,
         *int nFloat 小数位数,
         *ref byte[] arrBytes 保存的字节数组
         *返回描述：bool true 转换成功，false 失败
         *功能描述：将浮点数转换为BCD码
         */

        public static bool floatStringToBCD(string sFloat,int nIntSize,int nFloat, ref byte[] arrBytes)
        {
            if (sFloat == "" || (nIntSize + nFloat)%2 > 0)
            {
                return false;
            }
            
            string sLeft;
            string sRight;
            int nFirstPos = sFloat.IndexOf('.');
            int nOldLen = sFloat.Length;
            int nPos = nFirstPos;
            while (nPos >= 0)
            {
                sFloat = sFloat.Remove(nPos, 1);
                nPos = sFloat.IndexOf('.');
            }

            if (nFirstPos == 0)
            {
                sLeft = new string('0', nIntSize);
                sRight = sFloat;
            }
            else if (nFirstPos == -1 || nFirstPos == (nOldLen - 1))
            {
                sLeft = sFloat;
                sRight = new string('0', nFloat);
            }
            else
            {
                sLeft = sFloat.Substring(0, nFirstPos);
                sRight = sFloat.Substring(nFirstPos, sFloat.Length - nFirstPos);
            }
            
            sLeft = sLeft.PadLeft(nIntSize, '0');
            sRight = sRight.PadRight(nFloat,'0');
            string sOK = sLeft.Substring(sLeft.Length - nIntSize, nIntSize) + sRight.Substring(0, nFloat);

            arrBytes = new byte[sOK.Length / 2];
            for (int i = 0; i < sOK.Length / 2; i++)
            {
                arrBytes[i] = Convert.ToByte(sOK.Substring(2 * i, 2), 16);
            }

            return true;
        }
    }
}