Cannot convert from XMLElement[] to XMLElement

Programming Questions

danielsgr..

Cannot convert from XMLElement[] to XMLElement

in Programming Questions • 2 years ago

Hi,

I'm pretty new to Processing, but am working on uni coursework for a Processing unit. For the coursework we have to visualise the data from the weather feed that runs one of the campus buildings. While doing this I have encountered the error "Cannot convert from XMLElement[] to XMLElement" in my BarGroup class, posted below.

Any help or feedback would be hugely appreciated as I am at complete loss.

import processing.xml.*;
class BarGroup
{
String xmlUrl;
XMLElement xml = new XMLElement(getParent(), xmlUrl);
XMLElement xmlValue = xml.getChildren("channel/item/description");
float[] data = convertToFloat(xmlValue);
int groupXpos
Bar[] group = new Bar[3];
// COnstructor
BarGroup ( String url, int xPos)
{
xmlUrl = url;
groupXpos = xPos;
group[0] = new Bar( color(0, 255 ,0 ), 0, map( data[0], 0, highestValue(), 0, 600), (10 * 1) );
group[1] = new Bar( color(0, 255 ,0 ), 0, map( data[1], 0, highestValue(), 0, 600), (10 * 2) );
group[2] = new Bar( color(0, 255 ,0 ), 0, map( data[2], 0, highestValue(), 0, 600), (10 * 3) );
}
// Show the group of Bars
void display()
{
for (int i = 0; i < 2; i++)
{
group[i].display();
}
}
// Turn the XMLElement into an Array of Floats
float[] convertToFloat( XMLElement[] toConvert )
{
String numberOne = toConvert[0].getContent();
String numberTwo = toConvert[1].getContent();
String numberThree = toConvert[2].getContent();
println(numberOne);
println(numberTwo);
println(numberThree);
float[] returnValues = new float[3];
returnValues[0] = float(numberOne);
returnValues[1] = float(numberTwo);
returnValues[2] = float(numberThree);
return returnValues;
}
// Find the biggest number
float highestValue( float numberRange[] )
{
if ( numberRange[0] > numberRange[1] && numberRange[0] > numberRange[2] )
{
return numberRange[0];
}
else if ( numberRange[1] > numberRange[0] && numberRange[1] > numberRange[2])
{
return numberRange[1];
}
else if ( numberRange[2] > numberRange[0] && numberRange[2] > numberRange[1])
{
return numberRange[2];
}
}
}

Thanks in advance for any help, feel free to ask questions.
Daniel Groves

Replies(2)

PhiLho

Re: Cannot convert from XMLElement[] to XMLElement

2 years ago

An advice: when reporting an error, indicate the precise line where it happens, particularly when we cannot run your code.

Well, I think I guessed. It should be on the line XMLElement xmlValue = xml.getChildren("channel/item/description");
The message is explicit: you use a function returning an array of XMLElements (the XMLElement[] notation) and you try to fit it in a single element. It can't work.
Try: XMLElement[] xmlValues = xml.getChildren("channel/item/description");
Note: the array might have only one element.

danielsgr..

Re: Cannot convert from XMLElement[] to XMLElement

2 years ago

Thanks phi.lho, thats got it in one, not sure why I didn't think to mention what line was causing it.

Few more bugs an I should be done with this one, but will give them my best shot at fixing before I ask for any further help :)

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