J8583 LLLLBIN和LLLLVAR产生不同的长度填充结果

Question

LLLLVAR and LLLLBIN produces different length produced from the same input.

Tried to pass in the value "6832" into the same IsoMessage object, however, LLLLVAR returns " 0004 6382", while LLLLBIN returns " 0008 36333832".

Sample of the source code as below:

msg.setValue(60, "6832".toByteArray(Charsets.US_ASCII), IsoType.LLLLBIN, 10)//encodes to 000836333832 
msg.setValue(60, "6832", IsoType.LLLLVAR, 10) //encodes to 00046382 

I though both should return 0004, why are both results different?

Answer 1

When you encode ISO messages as text, the LxBIN fields encode their data in hex, and so the size is double what you'd expect. However, the decoder decodes the hex data and gives you a byte array when parsing.

LxVAR and LxBIN fields only have the same length when the whole message is encoded using binary formatting.