Trying to get property of non-object - CodeIgniter Error

Question

I am new to codeigniter and i am trying to integrate Klout API to codeigniter and i have this error saying Trying to get property of non-object Here

I have places the API out side of the application folder

My will be KloutAPIv2.class

<?php
// Define

DEFINE("HTTP_GET","GET");
DEFINE("HTTP_POST","POST");

// Get Started

class KloutAPIv2 {

/** @var String $BaseUrl The base url for the Klout API */
private $BaseUrl = "http://api.klout.com/";

/** @var String $Version YYYYMMDD */
private $Version = '20120511'; 

/** @var String $KloutKey */
private $KloutKey;

/**
 * Constructor for the API
 * Prepares the request URL and client api params
 * @param String $client_id
 * @param String $client_secret
 * @param String $version Defaults to v2, appends into the API url
 */
public function  __construct($kloutapi_key = false, $version="v2"){
    $this->BaseUrl = "{$this->BaseUrl}$version/";
    $this->KloutKey = $kloutapi_key;
}

/******************************************************/
//       Identity
/******************************************************/

/** 
 * KloutIDLookupByName
 * Looks up a Klout ID from a Screen Name
 * @param String $network The network to look the screen name up on
 * @param String $screenName The screen name to look up
 */
public function KloutIDLookupByName($network, $screenname){
    // Build the URL
    $url = $this->BaseUrl . "identity.json/". $network;
    // Append the lookup details
    $params['screenName'] = $screenname;
    $params['key'] = $this->KloutKey;
    // Return the result;
    $CurlResult = $this->GET($url,$params);
    $ResultString = json_decode($CurlResult);
    // Assume it only returns "ks" data:
    $KloutID = $ResultString->id;

    return $KloutID; 
}

/** 
 * KloutIDLookupByID
 * Looks up a Klout ID from a Twitter ID
 * @param String $network The network to look the screen name up on
 * @param String $id The screen name to look up
 */
public function KloutIDLookupByID($network, $id){
    // Build the URL
    $url = $this->BaseUrl . "identity.json/". $network ."/". $id;
    // Append the lookup details
    $params['key'] = $this->KloutKey;
    // Return the result;
    $CurlResult = $this->GET($url,$params);
    $ResultString = json_decode($CurlResult);
    // Assume it only returns "ks" data:
    $KloutID = $ResultString->id;

    return $KloutID; 
}


/** 
 * KloutIDLookupReverse
 * Looks up a Klout ID from a Twitter ID
 * @param String $network The network to look the screen name up on
 * @param String $id The screen name to look up
 */
public function KloutIDLookupReverse($network, $id){
    // Build the URL
    $url = $this->BaseUrl . "identity.json/klout/". $id ."/". $network;
    // Append the lookup details
    $params['key'] = $this->KloutKey;
    // Return the result;
    return $this->GET($url,$params);

}
/******************************************************/
//       User
/******************************************************/

/** 
 * KloutUser
 * Looks up Klout User Data
 * @param String $id The Klout ID to look up
 */
public function KloutUser($id){
    // Build the URL
    $url = $this->BaseUrl ."user.json/". $id;
    // Append the lookup details
    $params['key'] = $this->KloutKey;
    // Return the result;
    return $this->GET($url,$params);

}

/** 
 * KloutUserScore
 * Looks up Klout User Score
 * @param String $id The Klout ID to look up
 */
public function KloutUserScore($id){
    // Build the URL
    $url = $this->BaseUrl ."user.json/". $id ."/score";
    // Append the lookup details
    $params['key'] = $this->KloutKey;
    // Return the result;
    return $this->GET($url,$params);

}

/** 
 * KloutUserTopics
 * Looks up Klout User Topics
 * @param String $id The Klout ID to look up
 */
public function KloutUserTopics($id){
    // Build the URL
    $url = $this->BaseUrl ."user.json/". $id ."/topics";
    // Append the lookup details
    $params['key'] = $this->KloutKey;
    // Return the result;
    return $this->GET($url,$params);

}

/** 
 * KloutUserInfluence
 * Looks up Klout User Influence
 * @param String $id The Klout ID to look up
 */
public function KloutUserInfluence($id){
    // Build the URL
    $url = $this->BaseUrl ."user.json/". $id ."/influence";
    // Append the lookup details
    $params['key'] = $this->KloutKey;
    // Return the result;
    return $this->GET($url,$params);

}



/******************************************************/
//       Scores
/******************************************************/

/** 
 * KloutScore
 * Looks up Klout Score, does not return any other data
 * @param String $id The Klout ID to look up
 */
public function KloutScore($id){
    // Use the Klout Score Data call to pull just the Score
    $CurlResult = $this->KloutUserScore($id);
    $ResultString = json_decode($CurlResult);
    $KloutScore = $ResultString->score;

    return $KloutScore; 
}

/** 
 * KloutScore
 * Returns changes in klout score
 * @param String $id The Klout ID to look up
 * @param String $period options are either day, week, month
 */
public function KloutScoreChanges($id, $period){
    // Use the Klout Score Data call to pull just the Score
    $CurlResult = $this->KloutUserScore($id);
    $ResultString = json_decode($CurlResult);
    if ($period == "day") {
        $KloutScoreChanges = $ResultString->scoreDelta->dayChange;
    } elseif ($period == "week") {
        $KloutScoreChanges = $ResultString->scoreDelta->weekChange;
    } else {
        $KloutScoreChanges = $ResultString->scoreDelta->monthChange;
    }
    return $KloutScoreChanges; 
}




/******************************************************/
//       Utility
/******************************************************/

/**
 * Request
 * Performs a cUrl request with a url generated by MakeUrl. 
 * @param String $url The base url to query
 * @param Array $params The parameters to pass to the request
 */
private function Request($url,$params=false,$type=HTTP_GET){

    // Populate data for the GET request
    if($type == HTTP_GET) $url = $this->MakeUrl($url,$params);

    // borrowed from Andy Langton: http://andylangton.co.uk/
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
    if ( isset($_SERVER['HTTP_USER_AGENT']) ) {
        curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT'] );
    }else {
        // Handle the useragent like we are Google Chrome
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.X.Y.Z Safari/525.13.');
    }
    curl_setopt($ch , CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    // Populate the data for POST
    if($type == HTTP_POST){
        curl_setopt($ch, CURLOPT_POST, 1); 
        if($params) curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
    }

    $result=curl_exec($ch);
    $info=curl_getinfo($ch);
    curl_close($ch);

    return $result;
}

/**
 * GET
 * Abstraction of the GET request
 */
private function GET($url,$params=false){
    return $this->Request($url,$params,HTTP_GET);
}

/**
 * POST
 * Abstraction of a POST request
 */
private function POST($url,$params=false){
    return $this->Request($url,$params,HTTP_POST);
}

/**
 * MakeUrl
 * Takes a base url and an array of parameters and sanitizes the data, then creates a complete
 * url with each parameter as a GET parameter in the URL (Credit to Stephen Young)
 * @param String $url The base URL to append the query string to (without any query data)
 * @param Array $params The parameters to pass to the URL
 */ 
private function MakeUrl($url,$params){
    if(!empty($params) && $params){
        foreach($params as $k=>$v) $kv[] = "$k=$v";
        $url_params = str_replace(" ","+",implode('&',$kv));
        $url = trim($url) . '?' . $url_params;
    }
    return $url;
}

} ?>

and I create a controller as klout.php

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class klout extends CI_Controller {

    public $kloutapi_key;

    function __construct() {
        parent::__construct();
        $this->load->file('./klout/KloutAPIv2.class.php');
        $this->kloutapi_key = 'key';
    }

    public function kloutID() {

        $network = "twitter";
        $userid = 318066771330736;

       $klout = new KloutAPIv2($this->kloutapi_key);
     $kloutid = $klout->KloutIDLookupByID($network, $userid);

        print_r($kloutid);
        exit();

    }

}

?>

Answer 1

There's a slight variation to accomodate for Twitter IDs versus Twitter screen names: the URL structure is different, and the 'network' string is different:

• When calling by ID, the network is "tw"
• When calling by Screen Name, the network is "twitter"

[This is mostly a workaround of our API Proxy's route matching system].

So, by ID: http://api.klout.com/v2/identity.json/tw/318066771330736?key=foo

By Screen Name: http://api.klout.com/v2/identity.json/twitter?screenName=jack&key=foo

Answer 2

I think you must load your code as a library, not using $this->load->file, I check Code Igniter user guide about $this->load->file:

$this->load->file('filepath/filename', true/false)

This is a generic file loading function. Supply the filepath and name in the first parameter and it will open and read the file. By default the data is sent to your browser, just like a View file, but if you set the second parameter to true (boolean) it will instead return the data as a string.

So, my recomendation is to use a library. Put your KloutAPIv2.class.php in a file called klout.php in your application/libraries folder and load it usign $this->load->library('kout');

You can pass parameter to constructor when you're loading your library, as shown in this example:

$params = array('type' => 'large', 'color' => 'red');
$this->load->library('Someclass', $params);

More information: http://ellislab.com/codeigniter/user-guide/general/creating_libraries.html