UCS2编码与解码

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UCS2编码与解码

2011-09-09 10:58

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

// C++

/*--------------------------------------------------------------*/
// UCS2编码
// 输入: pSrc - 源字符串指针
//       nSrcLength - 源字符串长度
// 输出: pDst - 目标编码串指针
// 返回: 目标编码串长度
/*----------------------------------------------------------------*/
int gsmEncodeUcs2(const char* pSrc, unsigned char* pDst, int nSrcLength)
{
     int nDstLength;        // UNICODE宽字符数目
     WCHAR wchar[128]; // UNICODE串缓冲区

     // 字符串-->UNICODE串
     nDstLength = MultiByteToWideChar(CP_ACP, 0, pSrc, nSrcLength, wchar, 128);

     // 高低字节对调，输出
     for(int i=0; i<nDstLength; i++)
     {
         *pDst++ = wchar[i] >> 8;         // 先输出高位字节
         *pDst++ = wchar[i] & 0xff;       // 后输出低位字节
     }

     // 返回目标编码串长度
     return nDstLength * 2;
}

/*----------------------------------------------------*/
// UCS2解码
// 输入: pSrc - 源编码串指针
//       nSrcLength - 源编码串长度
// 输出: pDst - 目标字符串指针
// 返回: 目标字符串长度
/*-------------------------------------------------------*/
int gsmDecodeUcs2(const unsigned char* pSrc, char* pDst, int nSrcLength)
{
     int nDstLength;        // UNICODE宽字符数目
     WCHAR wchar[128]; // UNICODE串缓冲区

     // 高低字节对调，拼成UNICODE
     for(int i=0; i<nSrcLength/2; i++)
     {
         wchar[i] = *pSrc++ << 8;    // 先高位字节
         wchar[i] |= *pSrc++;        // 后低位字节
     }

     // UNICODE串-->字符串
     nDstLength = WideCharToMultiByte(CP_ACP, 0, wchar, nSrcLength/2, pDst, 160, NULL, NULL);

     // 输出字符串加个结束符
     pDst[nDstLength] = '\0';

     // 返回目标字符串长度
     return nDstLength;
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

// C#

        /// <summary>
        /// UCS2解码
        /// </summary>
        /// <param name="src"> UCS2 源串 </param>
        /// <returns> 解码后的UTF-16BE字符串</returns>
        public static string DecodeUCS2(string src)
        {
            string decucs = src;//src.Remove(src.IndexOf("\r"));
            string pstr = "^[0-9a-fA-F]+$";
            if (!Regex.IsMatch(decucs, pstr))
            {
                return "非法字符串无法解析！";
            }

StringBuilder builer = new StringBuilder();

            for (int i = 0; i < decucs.Length; i += 4)
            {
                int unicode_nu = Int32.Parse(decucs.Substring(i, 4), System.Globalization.NumberStyles.HexNumber);
                builer.Append(string.Format("{0}", (char)unicode_nu));
            }

return builer.ToString();
}

        /// <summary>
        /// UCS2编码
        /// </summary>
        /// <param name="src"> UTF-16BE编码的源串</param>
        /// <returns>编码后的UCS2串 </returns>
        public static string EncodeUCS2(string src)
        {
            StringBuilder builer = new StringBuilder();
            builer.Append("000800");
            byte[] tmpSmsText = Encoding.Unicode.GetBytes(src);
            builer.Append(tmpSmsText.Length.ToString("X2")); //正文内容长度
            for (int i = 0; i < tmpSmsText.Length; i += 2) //高低字节对调
            {
                builer.Append(tmpSmsText[i + 1].ToString("X2"));//("X2")转为16进制
                builer.Append(tmpSmsText[i].ToString("X2"));
            }
            builer = builer.Remove(0, 8);

return builer.ToString();
}