Converting a hex string into a BYTE array JS

Question

I have been at this for a bit, and I am new to programing with JS. I am making a game using JS, HTML5, node and socket.io. I am working on the protocol right now and I am sending the server strings that are hex.

An example of a string would be: 00010203040506070809

I am having a hard time converting it to: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09

What I plan on doing is taking these custom packets and having a switch on my server based on the packets. So for example:

BYTE HEADER | + Packet
0x00        | 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09

Then I call: parsepacket(header, data, len);

function parsepacket(header, data, len){
switch(header)
{
case '0x00':    // not hexed
console.log('The client wants to connect');
// Do some stuff to connect
break;

case '0x01':
console.log('0x01');
break;

case '0x02':
console.log('0x02!');
break;
}
};

Does anyone know how to do this?

This might be useful: nodejs.org/api/buffer.html

Francesco Laurita
– Francesco Laurita

2012-04-12 10:12:35 +00:00
Commented Apr 12, 2012 at 10:12 — Francesco Laurita
– Francesco Laurita, Commented Apr 12, 2012 at 10:12

Joel Lundberg · Accepted Answer · 2012-04-12 10:24:27Z

10

I'm not sure this is what you're after, but you can convert the string to an array of hex values like this:

var str = "00010203040506070809",
    a = [];

for (var i = 0; i < str.length; i += 2) {
    a.push("0x" + str.substr(i, 2));
}

console.log(a); // prints the array
console.log(a.join(" ")); // turn the array into a string of hex values
console.log(parseInt(a[1], 16)); // parse a particular hex number to a decimal value

answered Apr 12, 2012 at 10:24

Joel Lundberg

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2 Comments

user1328762 Over a year ago

Thats exactly what I wanted! Bravo! :-)

Supersharp Over a year ago

You don't need to add 0x before an hexadecimal value to parse it.

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