Android Question Need convert HEX string to Symbols

Sandman

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• Jul 12, 2018

• #2

I would use regex.split. First split on &# to get each chunk with hex code and potentially trailing non-hex text. Then iterate over that list, and on each chunk another regex.split, this time on the ;. First match will be the hexcode that you need to convert to a char, and if there's another match, that's just pure text to add.

 

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Juanll2003uy

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• Jul 12, 2018

• #3

Hi Sandman, i have tried with this code, to find all the hex elements and try to convert to symbol
But when the hex is for example "�" it crush in bconv.HexToBytes("�")
And the symbols that i receive arent the correct in the string
I dont know if the functions that i use are the correct to it

B4X:

            i=PrintBuffer.IndexOf("&#")
            j=PrintBuffer.IndexOf2(";",i)
            Do While i >= 0
                bytearray=Null
                bytearray = bconv.HexToBytes(PrintBuffer.SubString2(i,j+1))
                PrintBuffer=PrintBuffer.Replace(PrintBuffer.SubString2(i,j+1), bconv.StringFromBytes(bytearray, "UTF8"))

                i=PrintBuffer.IndexOf("&#")
                j=PrintBuffer.IndexOf2(";",i)
            Loop

 

Last edited: Jul 12, 2018

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Sandman

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• Jul 12, 2018

• #4

First of all, delete your duplicate post, and wrap your code in code tags before Erel or DonManfred sees you.



Your code seems overly complicated. Give regex.split a shot, and don't do any replacing in the hex.txt file, just build a new file.

 

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Juanll2003uy

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• Jul 12, 2018

• #5

Thanks. I did it.
Some idea to convert hex to the symbol?
Any function?

 

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Jeffrey Cameron

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• Jul 12, 2018

• #6

This does not appear to be any standard byte encoding scheme that I am familiar with. Where is this data coming from? I'm guessing that whatever is sending it should tell you how to interpret it in their SDK or API documentaion.

 

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Juanll2003uy

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• Jul 12, 2018

• #7

Ok thanks, it is a webservice that returns that string to send print.

 

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Jeffrey Cameron

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• Jul 12, 2018

• #8

Then the code may be a specific printer language, have you tried sending that string directly to the printer?

 

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Juanll2003uy

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• Jul 13, 2018

• #9

Yes, but it dont work because i need convert HEX to Symbol before

 into SCAPE
 INTO Data Link Escape
� INTO Null

For example

But i dont find the way

 

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Jeffrey Cameron

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• Jul 13, 2018

• #10

Ah, I understand now! The string you're getting is not byte encoded, it his HTML Encoded. I suggest you search here or on the web for HTML decoding a string.

Edit: Perhaps you could make use of this as in-line java?
https://code.i-harness.com/en/q/f2c1b

 

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Juanll2003uy

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• Jul 13, 2018

• #11

I think that arent html codes else hexadecimal codes

 

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Jeffrey Cameron

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• Jul 13, 2018

• #12

That is exactly what I am saying, see: https://www.w3schools.com/html/html_symbols.asp

In VB.NET you would use the System.Web.HttpUtility.HtmlDecode function to return a string with all the escaped characters converted to their ASCII values, I do not think B4A/X has a built-in equivalent, hence the link I provided.

Edit: A quick search here also turned up this: https://www.b4x.com/android/forum/threads/replace-qout-with.90699/#post-573365

 

Last edited: Jul 13, 2018

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Juanll2003uy

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• Jul 13, 2018

• #13

It looks good!
I will use it and tell you,
thanks Cameron!

 

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Juanll2003uy

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• Jul 14, 2018

• #14

It works!
Thank you for all!

 

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