PDU短信发送编码程序（C# 2.0）[转]

程序中的sp是SerialPort类型的对象，在System.IO.Ports命名空间下 //手机号码转换为pdu模式         private string telc(string MobileNum)         {             int tl;             string ltem, rtem, ttem;             int ti;             ttem = "";             tl = MobileNum.Trim().Length;             if (tl != 11 && tl != 13)             {                 MessageBox.Show("wrong number:" + MobileNum);                 return "";             }             if (tl == 11)  // 11位转换为13位             {                 tl += 2;                 MobileNum = "86" + MobileNum;             }             for (ti = 0; ti < tl; ti += 2)             {                 ltem = MobileNum.Substring(ti, 1);                 if (ti == tl - 1)                 {                     rtem = "F";                 }                 else                 {                     rtem = MobileNum.Substring(ti + 1, 1);                 }                 ttem += rtem + ltem;  //每两位颠倒             }             return ttem;         } //Unicode解码函数         private string ascg(string smsg)         {             string res="";             string ls;             string rs;             byte[] resByte = System.Text.UnicodeEncoding.Unicode.GetBytes(smsg);             for (int i = 0; i < resByte.Length ; i+=2)             {                 ls = resByte[i].ToString("X2");                 rs = resByte[i + 1].ToString("X2");                 res = res + rs + ls; //注意这里高低位颠倒             }             return res.Trim();         } private void SendSMS(string csca,string num, string msg)         {             string prex = "0891";             string midx = "11000D91";             string sufx = "000800";             string pdu, psmsc, pnum, pmsg;             string leng;             int length;             if (!sp.IsOpen)             {                 sp.Open();             }             length = (msg.Length) * 2;             leng = length.ToString("X");             if (length < 16)             {                 leng = "0" + leng;             }             psmsc = telc(csca).Trim();             pnum = telc(num).Trim();             pmsg = ascg(msg.Trim());             pdu = prex + psmsc + midx + pnum + sufx + leng + pmsg;//注意编码组合方式             sp.WriteLine("AT+CMGF=0/r");             sp.WriteLine("AT+CMGS=" + (15 + length).ToString() + "/r");             byte[] end = { 0x1a };             sp.WriteLine(pdu + System.Text.ASCIIEncoding.ASCII.GetString(end));         }