Parsing XML Data with XMLElement

in Core Library Questions • 1 year ago

Hello all,

I am new to XMLElement. I am pulling XML from a php site into a processing sketch, and I am trying to parse out the XML categories, so that I can just output the XML content in void draw(). Not completely sure where to go from here:

XMLElement xmlFeed;

void setup() {

size(600, 600);

xmlFeed = new XMLElement(this, "http://jonlinton.com/ipw/getsteps.php");

int numEntries = xmlFeed.getChildCount();

for (int i = 0; i < numEntries; i++) {

XMLElement kid = xmlFeed.getChild(i);

println(kid);

}

void draw() {

background(0);

}

Thanks!

Replies(7)

Kobby

Re: Parsing XML Data with XMLElement

1 year ago

you can get attributes with getFloat(), getInt(), or getString(), which all take strings with attribute names.

you can get the content of an xml node with getContent()

XMLElement xmlFeed;
void setup() {
size(600, 600);
xmlFeed = new XMLElement(this, "http://jonlinton.com/ipw/getsteps.php");
int numEntries = xmlFeed.getChildCount();
for (int i = 0; i < numEntries; i++) {
XMLElement kid = xmlFeed.getChild(i);
//get an attribute of an xml node
float exFloat = kid.getFloat("attrName");
int exInt = kid.getInt("attrName");
String exString = kid.getString("attrName");
//getting content from a node;
String nodeContent = kid.getContent();
println(exFloat);
println(exString);
println(exInt);
println(nodeContent);
println(kid);
}
}
void draw() {
background(0);
}

hope this helps,

Kobby

linton.jon

Re: Parsing XML Data with XMLElement

1 year ago

Thanks for the quick response!

I'm a little confused because, when I run the code below, the console prints a bunch of zeros, but printing the "kid" XMLElement to the console shows the data...

XMLElement xmlFeed;

void setup() {

size(600, 600);

xmlFeed = new XMLElement(this, "http://jonlinton.com/ipw/getsteps.php");

int numEntries = xmlFeed.getChildCount();

for (int i = 0; i < numEntries; i++) {

XMLElement kid = xmlFeed.getChild(i);

//get an attribute of an xml node

int id = kid.getInt("id");

float steps = kid.getFloat("steps");

float lon = kid.getFloat("lon");

float lat = kid.getFloat("lat");

//getting content from a node;

//String nodeContent = kid.getContent();

println(id);

println(steps);

println(lon);

println(lat);

//println(kid);

}

void draw() {

background(0);

}

PhiLho

Re: Parsing XML Data with XMLElement

1 year ago

id, steps, etc. are not attributes of a tag, in this XML, they are full sub-nodes of the entry node. Get the text of these notes, and use int() and float() to transform them to values.

linton.jon

Re: Parsing XML Data with XMLElement

1 year ago

So would you use getString() to get the text of the nodes? Can you share an example please?

Kobby

Re: Parsing XML Data with XMLElement

1 year ago

PhiLho is right sorry for the confusion and sending you wrong information.

I think what he means is that for getting attributes you want to do something like this:

String attrValue = kid.getString("lat");//get string returns the value of the attribute as a string
//then convert it to a float. Something along these lines...
float lon = (float)attrValue;

amnon.owed

Re: Parsing XML Data with XMLElement

1 year ago

As PhiLho pointed out they are not attributes. Which means you have to use getContent() and convert to the right type.

Adapted Code

void setup() {
XMLElement xmlFeed = new XMLElement(this, "http://jonlinton.com/ipw/getsteps.php");
int numEntries = xmlFeed.getChildCount();
for (int i=0; i<numEntries; i++) {
XMLElement entry = xmlFeed.getChild(i);
XMLElement[] kids = entry.getChildren();
int id = int(kids[0].getContent());
float steps = float(kids[1].getContent());
float lon = float(kids[2].getContent());
float lat = float(kids[3].getContent());
println("entry = " + i + " | id = " + id + " | steps = " + steps + " | lon = " + lon + " | lat = " + lat);
}
exit();
}

linton.jon

Re: Parsing XML Data with XMLElement

1 year ago

I now understand. Thank you very much for the speedy help.

Great stuff!

-Jon

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