unhex data problem

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mataarsak

in General Discussion » Other • 1 year ago

I'm trying to unhex data but I receive this error :

void receive(byte[] data, String HOST_IP, int PORT_RX) {

receivedFromUDP ="";

int h = unhex(receivedFromUDP);

for (int i = 0; i < data.length; i++) {

h += str(data[i]) + " ";

}

println(data);

}

[javac] C:\DOCUME~1\matdator\LOCALS~1\Temp\android8608532289813964485.pde\src\changethispackage\beforesubmitting\tothemarket\sketch_may16b\sketch_may16b.java:38: cannot find symbol

[javac] symbol : class string

[javac] location: class changethispackage.beforesubmitting.tothemarket.sketch_may16b.sketch_may16b

[javac] string h = unhex(receivedFromUDP);

[javac] ^

[javac] 2 errors

any help ?

Replies(9)

kooogy

parseInt's not in the reference.

perhaps you need to qualify the method name? it's a static method of the Integer class so...

Integer.parseInt(data, 16);

or the problem could be that it's expecting a String but you're giving it byte[]

mataarsak

Re: convert hex to decimal

1 year ago

Here is my code , I receive some udp packets in processing but they are in hexadecimal format and I don't know how to convert them to decimal.

import hypermedia.net.*;

int PORT_RX=3000; //port

String HOST_IP="192.168.0.21"; //

UDP udp;

String receivedFromUDP = "";

void setup() {

size(400,400);

udp= new UDP(this,PORT_RX,HOST_IP);

udp.log(true);

udp.listen(true);

super.start();

}

void draw() {

background(0);

text(receivedFromUDP, 50, 50);

}

void receive(byte[] data, String HOST_IP, int PORT_RX) {

receivedFromUDP ="";

for (int i = 0; i < data.length; i++) {

receivedFromUDP += str(data[i]) + " ";

}

println(data);

}

PhiLho

Re: unhex data problem

1 year ago

Duplicate thread, avoid this, please.
You show int h = unhex(receivedFromUDP); and the message indicates a line string h = unhex(receivedFromUDP);
You should try and be consistent in your error reporting... Beside, string's class is String, with a capital S.
And as I wrote in the other thread, I don't think you receive hex data, but binary data. So unhex isn't useful.

mataarsak

Re: unhex data problem

1 year ago

sorry for duplicate threat , but it's not binary ! it's hexadecimal , binary data is just 0 and 1 ! actually I do this in matlab like this :

>> hex2num('c0399999a0000000')

ans =

-25.6000

PhiLho

Re: unhex data problem

1 year ago

"binary data is just 0 and 1"
Technically, it is right, but technically, all data in a computer is just made of 0 and 1...
By binary, we generally mean data that is not Ascii, not textual. Hexa data is actually just an Ascii representation of such binary data. If you transmit the "01F2" string, it is actually 48, 49, 70, 50 in decimal representation, or 0x30 0x31 0x46 0x32 in hexa representation, and I save you the binary representation... Ie. that's Ascii characters representing an hexa value. What you shown in the other thread was "binary" data, including 0x00 and similar, ie. non-Ascii bytes.

Not sure if I am clear...

mataarsak

Re: unhex data problem

1 year ago

Actually I don't understand what do you mean , because hex2num convert hexadecimal number string to double-precision number. you can refer to this page for more information.

kooogy

Re: unhex data problem

1 year ago

other thread (including answer) here:

https://forum.processing.org/topic/convert-hex-to-numbers-and-save-into-an-array

THIS is why starting multiple threads is a pain...

mataarsak

Re: unhex data problem

1 year ago

I'm really disappointed. when I run the above code on my mobile this is the output . totally nonsense ! I even didn't convert it but it seems that it convert hexadecimal to this format itself !

64 71 32 0 0 0 0 0 -65 -39 -103 -103 -96 0 0 0 64 89 -93 51 64 0 0 0 -64 0 -52 -52 -64 0 0 0 64 86 -68 -52 -64 0 0 0 63 -10 102 102 96 0 0 0 64 100 120 0 0 0 0 0 -64 26 -52 -52 -64 0 0 0 64 70 108 -52 -64 0 0 0 63 -39 -103 -103 -96 0 0 0 64 111 -32 0 0 0 0 0 64 89 -128 0 0 0 0 0 64 71 -7 -103 -96 0 0 0 0 0 0 0 0 0 0 0 64 111 -32 0 0 0 0 0 -64 57 -103 -103 -96 0 0 0 64 111 -32 0 0 0 0 0 -64 57 -103 -103 -96 0 0 0 64 111 -32 0 0 0 0 0 -64 57 -103 -103 -96 0 0 0 64 111 -32 0 0 0 0 0 -64 57 -103 -103 -96 0 0 0 64 111 -32 0 0 0 0 0 -64 57 -103 -103 -96 0 0 0

kooogy

Re: unhex data problem

1 year ago

please stop posting to two of your threads, it makes it really hard to follow. concentrate the answers in one place.

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