openiso8583.net - OpenISO8583.Net BCD 修复格式解包错误

Question

我从code.google下载了代码并得到了最新版本v0.5.2
我设置了一个bcd fix格式的字段，即bcd格式的N-6（bit._003_proc_code）
例如：
*字段定义：<br/> DefaultTemplate =新模板 { { Bit._002_PAN, FieldDescriptor.BcdVar(2, 19,Formatters.Ascii) }, { Bit._003_PROC_CODE, FieldDescriptor.BcdFixed(3)}, { Bit._004_TRAN_AMOUNT, FieldDescriptor.BcdFixed(6) }, . ...... }

用法：

Iso8583 msg =new Iso8584();
msg[3]="000000";

当我解包消息时，我只能从消息 3 中得到“0000”。
这是定义中的错误还是错误

Answer 1

我会等着听 John Oxley 的消息，看看这是否只是一个编码错误。既然我这么说，我认为这是一个错误。

我遇到了 BcdFixed 定义的问题，最终创建了一个新的 Fixed Length BCD 格式化程序来解决这个问题。

这是我所做的：

1. 我创建了一个名为 FixedLengthBcdFormatter 的类，它是 FixedLengthFormatter 类的变体。

   /// /// 固定字段格式化程序 /// public class FixedLengthBcdFormatter : ILengthFormatter { private readonly int _packedLength; 私有只读 int _unPackedLength;

   ///<summary>
   ///  Fixed length field formatter
   ///</summary>
   ///<param name = "unPackedLength">The unpacked length of the field.</param>
   public FixedLengthBcdFormatter(int unPackedLength)
   {
       _unPackedLength = unPackedLength;
       double len = _unPackedLength;
      _packedLength =  (int)Math.Ceiling(len / 2);
   }
   
   #region ILengthFormatter Members
   
   /// <summary>
   ///   Get the length of the packed length indicator.  For fixed length fields this is 0
   /// </summary>
   public int LengthOfLengthIndicator
   {
       get { return 0; }
   }
   
   /// <summary>
   ///   The maximum length of the field displayed as a string for descriptors
   /// </summary>
   public string MaxLength
   {
       get { return _unPackedLength.ToString(); }
   }
   
   /// <summary>
   ///   Descriptor for the length formatter used in ToString methods
   /// </summary>
   public string Description
   {
       get { return "FixedBcd"; }
   }
   
   /// <summary>
   ///   Get the length of the field
   /// </summary>
   /// <param name = "msg">Byte array of message data</param>
   /// <param name = "offset">offset to start parsing</param>
   /// <returns>The length of the field</returns>
   public int GetLengthOfField(byte[] msg, int offset)
   {
       return _unPackedLength;
   }
   
   /// <summary>
   ///   Pack the length header into the message
   /// </summary>
   /// <param name = "msg">Byte array of the message</param>
   /// <param name = "length">The length to pack into the message</param>
   /// <param name = "offset">Offset to start the packing</param>
   /// <returns>offset for the start of the field</returns>
   public int Pack(byte[] msg, int length, int offset)
   {
       return offset;
   }
   
   /// <summary>
   ///   Check the length of the field is valid
   /// </summary>
   /// <param name = "packedLength">the packed length of the field</param>
   /// <returns>true if valid, false otherwise</returns>
   public bool IsValidLength(int packedLength)
   {
       return packedLength == _packedLength;
   }
   
   #endregion
   

   }

2. 修改了 FieldDescription 类/BcdFixed 声明

   /// /// bcd 已修复。/// /// /// 长度。/// /// /// public static IFieldDescriptor BcdFixed(int unpackedLength) { return Create(new FixedLengthBcdFormatter(unpackedLength), FieldValidators.N, Formatters.Bcd, null); }

3. 然后更改您的格式化程序声明以提供解包长度作为参数。

   Bit._003_PROC_CODE, FieldDescriptor.BcdFixed(6)},

同样，所有这些可能都是不必要的，因为我对现有代码一无所知，但它对我有用。

我希望这有帮助。