Essay-Unity's string processing for different platforms (judging length, intercepting strings)

Before, because of the need to add IM system to the game project, when there was a character limit. (judging the length on the client side)

For the first time, I wanted to use the Character Limit component in NGUI's Input, but I found that the character length it judged was not divided into full-width and half-width.

Later, when using methods such as System.Text.Encoding.BigEndianUnicode to judge, it was found that the character lengths judged by Unity on different platforms are not the same.

Then I thought of using this method to determine the character length

/// <summary>
    /// 判断字符长度
    /// </summary>
    /// <param name="mString"></param>
    /// <returns></returns>
    public int CalculatePlaces(string mString)
    {
        int _placesNum = 0; //统计字节位数
        char[] _charArray = mString.ToCharArray();
        for (int i = 0; i < _charArray.Length; i++)
        {
            char _eachChar = _charArray[i];
            if (_eachChar >= 0x4e00 && _eachChar <= 0x9fa5) //判断中文字符
                _placesNum += 2;
            else if (_eachChar >= 0x0000 && _eachChar <= 0x00ff) //已2个字节判断
                _placesNum += 1;
        }
        return _placesNum;
    }

 Similarly, after judging the character length, you can correspondingly intercept fixed-length characters.

/// <summary>
    /// 截取字符
    /// </summary>
    /// <param name="_mString">字符</param>
    /// <param name="_mLenght">长度</param>
    /// <returns>定长度的字符</returns>
    public string InterceptPlaces(string _mString,int _mLenght)
    {
        int _placesNum = 0;
        char[] _charArray = _mString.ToCharArray();
        string _charReturn = string.Empty;
        for (int i = 0; i < _charArray.Length; i++)
        {
            if (_placesNum < _mLenght)
            {
                char _eachChar = _charArray[i];
                if (_eachChar >= 0x4e00 && _eachChar <= 0x9fa5) //判断中文字符
                    _placesNum += 2;
                else if (_eachChar >= 0x0000 && _eachChar <= 0x00ff) //已2个字节判断
                    _placesNum += 1;
                _charReturn += _eachChar.ToString();
            }
            else if (_placesNum >= _mLenght)
            {
                break;
            }
        }
        return _charReturn.ToString();
    }