Unable to Read Field Values From Ascii ISO Message

[veektorh]

I am trying to decode ISO message received from an ISO message simulator which uses Ascii format, But im unable to get it to work.

I can read the MTI successfully, but i get an empty string while trying to read any available field.

I have tried converting the bytes array buf to ascii and i can see the MTI in text and the original data elements, i cant see the bitmap properly most likely because its in binary. But i cant get the field values directly after unpacking the message.

I need help trying to read the field values using this library. Kindly Assist

Here's a snippet of my code below

``

           header := network.NewBinary2BytesHeader()
	_, err := header.ReadFrom(conn)

	buf := make([]byte, header.Length())
	_, err = conn.Read(buf)

	checkError(err)
	
	message := iso8583.NewMessage(iso8583.Spec87)
	message.Unpack(buf)

	mti, err := message.GetMTI()
	f7, err := message.GetString(7)
	f11, err := message.GetString(11)
	f123, err := message.GetString(123)
	checkError(err)

	fmt.Printf("MTI %s \n", mti)
	fmt.Printf("f7 : %s", f7)
	fmt.Printf("f11 : %s", f11)
	fmt.Printf("f123 : %s", f123)
}

[alovak]

@veektorh thanks for submitting the issue.

Can you show what it's in the buf? If it's ASCII you can fmt.Println(string(buf)) Also, what is the length of the message (header.Lenght())?

[veektorh]

header.length = 63 buf = [48 56 48 48 162 56 0 0 0 128 0 0 4 0 0 0 0 0 0 0 48 48 48 48 48 48 48 55 48 56 49 57 52 50 53 48 48 48 54 52 48 54 50 50 48 55 48 56 48 55 48 56 50 48 51 57 48 48 53 57 48 48 48]

[alovak]

Can you please also check for the error from message.Unpack(buf)?

[veektorh]

Error from Unpack : failed to unpack bitmap: failed to decode content for 1 bitmap: encoding/hex: invalid byte: U+00A2 '¢'

[alovak]

@veektorh, were you able to solve your issue? Do you still need any help? Can I close the ticket?

[wadearnold]

Isn't the issue that he is getting a cent sign 00A2 or ¢ in the message? That data element is supposed to have a number. @veektorh is it possible to get a copy of the raw message as an upload? Feel free to change the PAN. What type of system are you connecting to that possibly is sending the cent character?

[alovak]

We discussed the issue with the @veektorh privately and it's not relevant anymore. Closing it.