c#短信网关中关于短信内容编码的转换

无论在cmpp或sgip中，都会遇到短信编码格式转换的问题。

因为现在短信编码常用的格式有三种：0：ASCII串，8：UCS2编码，15：含GB汉字。在发送或接收短信时，都会用到相应的编码转换。如以下代码：

public static String Decode(Byte[] buf, int StartIndex, int Length, CODING Coding) { String str = String.Empty; if (Coding == CODING.ASCII) str = System.Text.Encoding.ASCII.GetString(buf, StartIndex, Length); else if (Coding == CODING.UCS2) str = System.Text.Encoding.BigEndianUnicode.GetString(buf, 0, Length); else if (Coding == CODING.GBK) str = System.Text.UnicodeEncoding.GetEncoding("gb2312").GetString(buf, StartIndex, Length); return str; } public static Byte[] Encode(String str, CODING coding) { Byte[] buf = null; if (str == null) return buf; if (coding == CODING.ASCII) buf = System.Text.Encoding.ASCII.GetBytes(str); else if (coding == CODING.UCS2) buf = System.Text.Encoding.BigEndianUnicode.GetBytes(str); else if (coding == CODING.GBK) buf = System.Text.UnicodeEncoding.GetEncoding("gb2312").GetBytes(str); return buf; } public static UInt32 CountLength(String str, CODING coding) { Byte[] buf = Encode(str, coding); if (buf != null) return (UInt32)buf.Length; else return 0; }

在处理接收DELIVER时，也可以这样写

if (Msg_Fmt != 8) { if (Msg_Fmt != 15) { this.Msg_Content = System.Text.Encoding.ASCII.GetString(buffer, iPos, (int)this.Msg_Length); } else { this.Msg_Content = System.Text.Encoding.Default.GetString(buffer, iPos, (int)this.Msg_Length); } } else { this.Msg_Content = System.Text.Encoding.BigEndianUnicode.GetString(buffer, iPos, (int)this.Msg_Length); }