Making Things Talk

382 MAKING THINGS TALK

void checkNetClient() {

// available() returns how many bytes have been received by the client:

if (client.available() > 0) {

// read a byte, convert it to a character, and add it to the string:

responseString +=char(client.read());

// add to a line of |'s on the screen (crude progress bar):

print("|");

}

// if there's no bytes available, either the response hasn't

// started yet, or it's done:

else {

// if responseString is longer than 0 bytes, the response has started:

if(responseString.length() > 0 ) {

// you've got some bytes, but now there's no more to read. Stop:

if(requestInProgress == true) {

// print the response:

println(responseString);

// note that the request is over:

requestInProgress = false;

// reset the string for future requests:

responseString = "";

}

}

}

}

Chapter 4

AIRNow Web Page Scraper

Language: PHP

Reads a web page and returns one line from it.

<?php

// url of the air quality index page for New York City:

$url =

'http://airnow.gov/index.cfm?action=airnow.showlocal&cityid=164';

$filePath = fopen ($url, "r"); // read the file at the URL

while (!feof($filePath)) // until the end of the file

{

$line = fgetss($filePath, 4096); // read each line

if ($readParticles == 1) { // previous was "observed at"