get iso fields byte numbers in c#

Deepak Veer

i have this iso8583 message0200B2200000001000000000000000800000201234000000010000011072218012345606A5DFGR021ABCDEFGHIJ 1234567890

now i want to find out in which byte array field is present.below output i need using c#. i know bitmap shows which fields are present in message. but i am still not able to get output which i needed.

Field-3 : 201234 Field-4 : 000000010000 Field-7 : 0110722180 Field-11 : 123456 Field-44 : A5DFGR Field-105 : ABCDEFGHIJ 1234567890  how can i do this ?

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes11y ago
Accepted answer
Well, I'll show you how you can parse that particular message using C# code:

using System;
using System.Collections.Generic;

class ISO8583
{
static void Main()
{
string m = "0200B2200000001000000000000000800000201234000000010000011072218012345606A5DFGR021ABCDEFGHIJ 1234567890";
string header = m.Substring(0, 4);
Console.WriteLine("Header : {0}", header);
string pb = m.Substring(4, 16); // primary bitmap
var bits = new List();
for(int i = 0; i < 16; i++)
{
byte b = Convert.ToByte(pb[i].ToString(), 16);
string s = Convert.ToString(b, 2).PadLeft(4, '0');
for(int j = 0; j < 4; j++) bits.Add((byte)(s[j] - 48));
}

int start = 20;

if(bits[0] == 1)
{
string sb = m.Substring(20, 16); // secondary bitmap
start = 36;
for(int i = 0; i < 16; i++)
{
byte b = Convert.ToByte(sb[i].ToString(), 16);
string s = Convert.ToString(b, 2).PadLeft(4, '0');
for(int j = 0; j < 4; j++) bits.Add((byte)(s[j] - 48));
}
}

for(int i = 1; i < bits.Count; i++)
{
if (bits[i] == 1)
{
string f = GetField(i + 1, m, ref start);
Console.WriteLine("Field-{0, -3} : {1}", i + 1, f);
}
}

Console.ReadKey();
}

static string GetField(int number, string m, ref int start)
{
int len = 0;

switch(number)
{
case 3: // n6
case 11:
start += 6;
return m.Substring(start - 6, 6);

case 4: // n12
start += 12;
return m.Substring(start - 12, 12);

case 7: // n10
start += 10;
return m.Substring(start - 10, 10);

case 44: // an..25
len = int.Parse(m.Substring(start, 2));
start += len + 2;
return m.Substring(start - len, len);

case 105: // ans...999
len = int.Parse(m.Substring(start, 3));
start += len + 3;
return m.Substring(start - len, len);

default:
return "Not yet supported";
}
}
}

The output, as you anticipated, is:

Header : 0200
Field-3 : 201234
Field-4 : 000000010000
Field-7 : 0110722180
Field-11 : 123456
Field-44 : A5DFGR
Field-105 : ABCDEFGHIJ 1234567890

To parse ANY message, you'll need to add code in the switch statement of the GetField method for all possible field numbers - there are 128 of them in the 1987 version but field 1 is used to indicate whether there's a secondary bitmap or not.

Check out:

http://en.wikipedia.org/wiki/ISO_8583
Vulpes11y ago
The problem is that some of the field lengths in the Specification you've posted differ from the standard. Also some of the field lengths in the former differ from those actually used!

I don't know why this should be though I note that we're now using the 1993 rather than the 1987 version judging by the header.

I've altered the program to allow for all this and indicated where the differences lie in the comments:

using System;
using System.Collections.Generic;

class ISO8583
{
static void Main()
{
string m = @"1210B0308001468180000000000000000028930000000000000000000090000000001220120221122326201202210650451112035708815408UNI000000BWY 088+0000000001265250+0000000001265250+0000000000000000+0000000000000000+0000000001265250INRINR003BWY885N0620100306S16103915 1TCID20100306 990.00TO ATM CASH /8504/FBL-ALUVA BJ \ 20100306142235 8529.4820100306S16140545 1TCID20100306 1000.00TO ATM CASH /8707/FBL-MAL-KODUNGALLUR \ 20100306185946 7529.4820100308S16199304 1TCID20100307 1200.00TO ATM CASH /0557/HDFC BANK LTD. \ 20100307201044 6329.4820100311S16766738 1TCID20100311 100.00FN/BillDesk/VODAFONE/MFBK0038091373 20100311155401 6229.4820100315S17132195 1TCID20100314 400.00TO ATM CASH /8155/FBL-MOONNUPEEDIKA \ 20100314121726 5829.4820100315S17132221 1TCID20100314 200.00TO ATM CASH /8156/FBL-MOONNUPEEDIKA \ 20100314121755 5629.48";

string header = m.Substring(0, 4);
Console.WriteLine("Message_ID = {0}", header);
string pb = m.Substring(4, 16); // primary bitmap
var bits = new List();
for(int i = 0; i < 16; i++)
{
byte b = Convert.ToByte(pb[i].ToString(), 16);
string s = Convert.ToString(b, 2).PadLeft(4, '0');
for(int j = 0; j < 4; j++) bits.Add((byte)(s[j] - 48));
}

int start = 20;

if(bits[0] == 1)
{
string sb = m.Substring(20, 16); // secondary bitmap
start = 36;
for(int i = 0; i < 16; i++)
{
byte b = Convert.ToByte(sb[i].ToString(), 16);
string s = Convert.ToString(b, 2).PadLeft(4, '0');
for(int j = 0; j < 4; j++) bits.Add((byte)(s[j] - 48));
}
}

for(int i = 1; i < bits.Count; i++)
{
if (bits[i] == 1)
{
string f = GetField(i + 1, m, ref start);
Console.WriteLine("Field {0:D3} = {1}", i + 1, f);
if (i >= 124)
{
Console.WriteLine("\nMORE TRANSACTION FLAG: {0}", f.Substring(0, 1));
int not = int.Parse(f.Substring(1, 2));
Console.WriteLine("NUMBER OF TRANSACTION: {0}", not);
}
}
}

Console.ReadKey();
}

static string GetField(int number, string m, ref int start)
{
int len = 0;

switch(number)
{
case 3: // n6
case 38: // n6
start += 6;
return m.Substring(start - 6, 6);

case 4: // n16 (STANDARD says n12)

start += 16;
return m.Substring(start - 16, 16);

case 11: // n12 (STANDARD says n6)
start += 12;
return m.Substring(start - 12, 12);

case 12: // n14 (STANDARD says n6)
start += 14;
return m.Substring(start - 14, 14);

case 17: // n8 (STANDARD says n4)
case 41: // ans8 (CUSTOM SPEC says ans16)
start += 8;
return m.Substring(start - 8, 8);

case 32: // n..11
case 34: // ns..28 (CUSTOM SPEC says ns...28)
len = int.Parse(m.Substring(start, 2));
start += len + 2;
return m.Substring(start - len, len);

case 48: // ans...999 (CUSTOM SPEC says ans.....999)
case 123: // ans...999
case 125: // ans...999
case 126: // ans...999
case 127: // ans...999
len = int.Parse(m.Substring(start, 3));
start += len + 3;
return m.Substring(start - len, len);

case 39: // n3 (STANDARD says an2)
case 49: // n3
start += 3;
return m.Substring(start - 3, 3);

default:
return "Not yet supported";
}
}
}

The output now is:

Message_ID = 1210
Field 003 = 930000
Field 004 = 0000000000000000
Field 011 = 900000000012
Field 012 = 20120221122326
Field 017 = 20120221
Field 032 = 504511
Field 034 = 035708815408
Field 038 = UNI000
Field 039 = 000
Field 041 = BWY
Field 048 = +0000000001265250+0000000001265250+0000000000000000+000000000000000
0+0000000001265250INR
Field 049 = INR
Field 123 = BWY
Field 125 = N0620100306S16103915 1TCID20100306 990.00TO ATM CASH
/8504/FBL-ALUVA BJ \ 20100306142235 8529
.4820100306S16140545 1TCID20100306 1000.00TO ATM CASH /8707/FBL-
MAL-KODUNGALLUR \ 20100306185946 7529.4820100308S1
6199304 1TCID20100307 1200.00TO ATM CASH /0557/HDFC BANK LTD.
\ 20100307201044 6329.4820100311S16766738 1TC
ID20100311 100.00FN/BillDesk/VODAFONE/MFBK0038091373 201
00311155401 6229.4820100315S17132195 1TCID20100314
400.00TO ATM CASH /8155/FBL-MOONNUPEEDIKA \ 20100314121726
5829.4820100315S17132221 1TCID20100314 200.0
0TO ATM CASH /8156/FBL-MOONNUPEEDIKA \ 20100314121755
5629.48

MORE TRANSACTION FLAG: N
NUMBER OF TRANSACTION: 6

Deepak Veer11y ago

hi vulpes.
i tried this solution on my project but it didnt work for me..
this is my iso string

1210B0308001468180000000000000000028930000000000000000000090000000001220120221122326201202210650451112035708815408UNI000000BWY 088+0000000001265250+0000000001265250+0000000000000000+0000000000000000+0000000001265250INRINR003BWY885N0620100306S16103915 1TCID20100306 990.00TO ATM CASH /8504/FBL-ALUVA BJ \ 20100306142235 8529.4820100306S16140545 1TCID20100306 1000.00TO ATM CASH /8707/FBL-MAL-KODUNGALLUR \ 20100306185946 7529.4820100308S16199304 1TCID20100307 1200.00TO ATM CASH /0557/HDFC BANK LTD. \ 20100307201044 6329.4820100311S16766738 1TCID20100311 100.00FN/BillDesk/VODAFONE/MFBK0038091373 20100311155401 6229.4820100315S17132195 1TCID20100314 400.00TO ATM CASH /8155/FBL-MOONNUPEEDIKA \ 20100314121726 5829.4820100315S17132221 1TCID20100314 200.00TO ATM CASH /8156/FBL-MOONNUPEEDIKA \ 20100314121755 5629.48

and this are the fields present in string
Message_ID = 1210
Field 003 = 930000
Field 004 = 0000000000000000
Field 011 = 900000000012
Field 012 = 20120221122326
Field 017 = 20120221
Field 032 = 504511
Field 034 = 035708815408
Field 038 = UNI000
Field 039 = 000
Field 041 = BWY
Field 048 = +0000000001265250+0000000001265250+0000000000000000+0000000000000000+0000000001265250INR
Field 049 = INR
Field 123 = BWY
Field 125 = N0620100306S16103915 1TCID20100306 990.00TO ATM CASH /8504/FBL-ALUVA BJ \ 20100306142235 8529.4820100306S16140545 1TCID20100306 1000.00TO ATM CASH /8707/FBL-MAL-KODUNGALLUR \ 20100306185946 7529.4820100308S16199304 1TCID20100307 1200.00TO ATM CASH /0557/HDFC BANK LTD. \ 20100307201044 6329.4820100311S16766738 1TCID20100311 100.00FN/BillDesk/VODAFONE/MFBK0038091373 20100311155401 6229.4820100315S17132195 1TCID20100314 400.00TO ATM CASH /8155/FBL-MOONNUPEEDIKA \ 20100314121726 5829.4820100315S17132221 1TCID20100314 200.00TO ATM CASH /8156/FBL-MOONNUPEEDIKA \ 20100314121755 5629.48

MORE TRANSACTION FLAG :N
NO OF TRANSACTION :6

this is data types and lenght

Bit	Name	Format	Attribute	Values	Remarks
	BASE24 Header	HEX	an 16	B0308001468180000000000000000028
	Message Type		n 4	1210
1	BIT MAP		b 1
3	Processing Code		n 6	Same as request msg
4	Amount, Transaction		n 16	Same as request msg
11	System Trace Audit Number		n 12	Same as request msg
12	Transmission Date & Time	YYYYMMDDHHmmSS	n 14	Same as request msg
17	Date, Capture	YYYYMMDD	n 8	Same as request msg
32	Acquiring Institution Identification Code	LLVAR	n.. 11	Same as request msg
34	Primary Account Number, extended		ns…28	Same as request msg
38	Auth. Identification Response code		n 6
39	Response code		n 3
41	Card Acceptor Terminal Identification		ans 16	Same as request msg
48	Additional Data - Private		ans…..999
49	Currency Code, Transaction		n 3	Same as request msg
123	Reserved Private	LLLVAR	ans…999
125	Reserved Private (below table contains sub field details)	LLLVAR	ans…999
126	Reserved Private (below table contains sub field details)	LLLVAR	ans…999
127	Reserved Private (below table contains sub field details)	LLLVAR	ans…999


Subfield details for field 125, field 126, field 127


Maximum 20 transaction details will be sent in response message for Passbook transaction inquiry request. If the response happens to contain more transactions, it sets the MORE_TRANSACTION_FLAG to 'Y', else it is 'N'. The TOTAL_STATEMENT_COUNT following MORE_TRANSACTION_FLAG in Field_125, is fixed 2 characters in length and denotes the total number of transactions in the response. When MORE_TRANSACTION_FLAG = 'Y', kiosk sends the transaction request same as above with additional information in Field_125.