Checksum operation (FF = h1 xor h2...)

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Hello,

I have a serious problem with count checksum of fiscal printer.

Main rule is:

FF = FF xor hex1 xor hex2 xor hex3 (...)

and then I should get some hexadecimal value (two signs, for example B7).

Later this value (B7) I should spread on B and 7 and save it as hex (B as hex and 7 as hex).

I'm not good with hex so can anybdody write me some code in vb.net?

Thanks in advance.

Posted 10-Aug-11 9:16am

szataniel

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Christian Graus · Answer 1 · 2011-08-10T11:50:00

There is no such thing as 'save as hex'. Hex is a representation. 10 Decimal and 0A hex are the same thing, written differently. So, unless you need to use string.Format to format your number visually as hex, the only issue you have is that you need to use bit masking to turn your number in to the two parts. You should explain what you mean by 'save as hex', do you need to literally save B and then 7, as characters ? If so, you can turn your number to hex and then split the string.

szataniel · Answer 2 · 2011-08-10T13:12:00

Christian - You have right, so let me explain:

i have some hex, for example: B7, A0, F2, C4.

Now I have to do something like that:

FF = FF XOR B7 XOR A0 XOR F2 XOR C4

and when I have value I must spread it on two characters (because this value will consist of two characters, right?), and convert them to hex. :)

Checksum operation (FF = h1 xor h2...)

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