Android Question how to Convert HEX to normal character ?

hears · Dec 1, 2017

i use this library :
https://www.b4x.com/android/forum/threads/felusbserial-alternative-usb-serial-library.62216/

recieved code from my USB serial device，it is connected to a HUAWEI WIFI router.

the code is in HEX ,i get by under event:

B4X:

Private Sub serial_DataAvailable (Buffer() As Byte)
    Log("New data: " & bc.HEXFromBytes(Buffer))
 
 
 
End Sub

in window system i use Super Terminal recieve it,all is normal character. I make APP in Android system now .how to Convert these HEX code ?

tigrot · Dec 1, 2017

Do you mean you have a string like "303132" and you want the chars for each couple, in this case "012"?
Mauro

hears · Dec 1, 2017

tigrot said:
Do you mean you have a string like "303132" and you want the chars for each couple, in this case "012"?
Mauro

yes ,303132 in normal string is 012

tigrot · Dec 1, 2017

Let me take lunch and I'll be back to you! Wife is calling!

hears · Dec 1, 2017

thank you , i get many code like this :"6720706f6f6c20697320696e69746900"

serial device code alway in HEX format.

DonManfred · Dec 1, 2017

Check ByteConverter Library

https://www.b4x.com/android/help/byteconverter.html#byteconverter_hextobytes
https://www.b4x.com/android/help/byteconverter.html#byteconverter_stringfrombytes

tigrot · Dec 1, 2017

I don't think you have to deal with hex format. This is only a way to show unprintable chars. You get bytes and you have to deal with them. You do a conversion which transforms bytes to hex. Display each byte and the work is done!
you string is "g pool is initi"

hears · Dec 1, 2017

DonManfred said:
Check ByteConverter Library

https://www.b4x.com/android/help/byteconverter.html#byteconverter_hextobytes
https://www.b4x.com/android/help/byteconverter.html#byteconverter_stringfrombytes

i have directly use 'stringfrombytes()' didn't change data format to HEX.
the result is wrongbyteconverter_stringfrombytes..i think the format from WIFI ROUTER send is HEX format.so must first get HEX COED.after change again to normal character

DonManfred · Dec 1, 2017

Check the documentation of byteconverter library!
You are doing it wrong!

Check StringToBytes and BytesToHex

hears · Dec 1, 2017

tigrot said:
I don't think you have to deal with hex format. This is only a way to show unprintable chars. You get bytes and you have to deal with them. You do a conversion which transforms bytes to hex. Display each byte and the work is done!

i have directly use 'stringfrombytes()' didn't change data format to HEX.
the result is wrongbyteconverter_stringfrombytes..i think the format from WIFI ROUTER send is HEX format.so must first get HEX COED.after change again to normal character

DonManfred · Dec 1, 2017

hears said:
i have directly use 'stringfrombytes()' didn't change data format to HEX.
the result is wrongbyteconverter_stringfrombytes..i think the format from WIFI ROUTER send is HEX format.so must first get HEX COED.after change again to normal character

OMG
It is not fun to help you! REALLY NOT.

READ the Documentation.

And try to understand what is happening with the different Methods!

hears said:
the format from WIFI ROUTER send is HEX format

So you FIRST need to convert the HEX to Bytes. https://www.b4x.com/android/help/byteconverter.html#byteconverter_hextobytes
And then the Bytes to a String. https://www.b4x.com/android/help/byteconverter.html#byteconverter_stringfrombytes

tigrot · Dec 1, 2017

It seems a status report.

tigrot · Dec 1, 2017

In you code you use HEXFROMBYTES(that's why you get HEX), convert byte to string directly!

tigrot · Dec 1, 2017

A modem NEVER send HEX litteral.

hears · Dec 1, 2017

ok,now it is work now . StringFromBytes() must add "utf8"

B4X:

Dim hexs As String
        hexs="6720706f6f6c20697320696e69746900"
  
        Log(bc.StringFromBytes(bc.HexToBytes(hexs),"utf8"))

tomorrow i will try WIFI router ...I think directly use "StringFromBytes() " maybe work too.

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