Helper class to write WAV formated audio files. The class expects audio input data in a byte array with samples represented as floats.

The default compressed code is set to PCM. The class resamples and formats the audio samples according to the class properties. The resampling geared for performance and not quality, for best quality use sampling rates that divide/multiple into the desired output samplingRate.

For more information about the WAVE file format see: http://ccrma.stanford.edu/courses/422/projects/WaveFormat/

via WAVWriter.as – ghostcat – AS3 library of generic tools

Flex Builder 4.5.x Test Drive for Mobile Tutorials

Here is a very good multi-part tutorial on the ins and outs of mobile client / server development, that adds some quite useful functionality on Android, Apple IOS and Blackberry mobile devices.

In this Test Drive, you are going to create a Flex mobile application that retrieves, displays, and modifies database records (see Figure 1). A Flex application does not connect directly to a remote database. Instead, you connect it to a data service written in your favorite web language (PHP, ColdFusion, Java, or any other server-side technology). You will build the front-end Flex mobile application; the database and the server-side code to manipulate database records is provided for you as a PHP class, a ColdFusion component, or Java classes.

The Mobile Test Drive application running on a mobile device.

Figure 1. The Mobile Test Drive application running on a mobile device.

via Adobe Developer Connection.

Data paging with Flex and PHP using Flash Builder 4.5.x

Flash Builder 4.5 has a built-in data paging feature that generates ActionScript code to retrieve data from the database incrementally on demand. For example, suppose your database has thousands of records and you want to fetch only 20 rows at a time and display them in a data grid. When you enable paging for an operation and bind the operation result to a DataGrid control, the first 20 records will be retrieved initially and the next page of records is fetched only when the user requests them—that is, when he or she scrolls the vertical scroll bar of the DataGrid control.

Flash Builder 4.5 lets you enable paging for any type of data service operation including operations on a Remoting service, web service, or HTTP service. This article explains how to enable data paging for a PHP-based Remoting service. After you set up the server environment required for the sample application, you’ll use Flash Builder 4.5 to generate ActionScript service classes and build a Flex application that incrementally retrieves data sets from a database table using the PHP class on the server.

via Adobe Developer Connection.

Zend_Server Class

e_schrade wrote a neat way of doing things in the service layer; Let’s take a quick look at something that’s kind of neat in Zend Framework. I’ve been doing some work with Adobe on some articles and one of them was on working with mobile clients with Flash. Well, me being the masochist I did more. What I did was write an example that worked as a full website, an Ajax website, a Flash service and an XML-RPC service.

Looks like a lot, right?  Actually there’s not much there.  Here’s the logic flow.

  • Is it an XMLHTTP Request and is it a POST? Create the Json server
  • Is it an AMF request? Create the AMF server
  • Is it an XmlRpc request? Create the XmlRpc server
  • Is it an XMLHTTP Request and is it a GET? Create the Service Map (for JSON-RPC 2.0)
  • If a service handler has been created add all of the application’s mappers, attach the service handler to the request and redirect to the service action.

And with that you have an application that can serve content for multiple different types of service with almost no effort on your part.  At least.. if you copy and paste this code.

Have a good Friday!!!

via Zend_Server – zf ffh zend_server on e_schrade – zend php.

Adding Zend_Cache to Flex/Flash Builder 4 Projects

I have som rather large and time consuming queries running in the Statistics screen of an NOC (Network Operations Center) Flex/Flash Builder 4 application i’we been tinkering with, to prevent the database server to be boggen down by multiple queries fired by this app in multiple places I had to implement caching.

And to do this is alot easier than it might sound like especially for the (PHP) Zend_AMF based services.

Once you have setup your Data Centric client/server  connection like it’s described in this Article @ DevZone you begin by editing the gateway.php;

// Store configuration in the registry
Zend_Registry::set("amf-config", $amf);

// Configure Zend_Cache
$frontendOptions = array(
'lifetime' => 12*3600,
'automatic_serialization' => true,
'default_options' => array(
'cache_with_get_variables' => true,
'cache_with_post_variables' => true,
'cache_with_session_variables' => true,
'cache_with_files_variables' => true,
'cache_with_cookie_variables' => true,
'make_id_with_get_variables' => true,
'make_id_with_post_variables' => true,
'make_id_with_session_variables' => true,
'make_id_with_files_variables' => true,
'make_id_with_cookie_variables' => true
$backendOptions = array(
'cache_dir' => '/tmp/'

$cache = Zend_Cache::factory('Core', 'File', $frontendOptions, $backendOptions);

// Store cache configuration in the registry
Zend_Registry::set("cache", $cache);

Then modify your service class to look similar to this;

public function getCustomerStatsByMonth() {
// Get the Cache from Registry
$cache = Zend_Registry::get("cache");
$id = 'getCustomerStatsByMonth';
if(!($rows = $cache->load($id)))
// We didnt find anything in the cache so lets get it from DB
$stmt = mysqli_prepare($this->connection, "SELECT
SUBSTR(FROM_UNIXTIME(`cdrs`.`start`),1,7) AS `month`,
ROUND(SUM(`cdrs`.`talktime`)/60) AS `minutes`,
COUNT(`cdrs`.`start`) AS `calls`
INNER JOIN es.cdrs
ON (outgroups.id = cdrs.outgroup)
INNER JOIN es.customers
ON (customers.id = cdrs.scustomer)
WHERE (outgroups.name_invoices LIKE 'Sweden%' AND cdrs.start > UNIX_TIMESTAMP('2010-01-01 00:00:00') AND cdrs.status = 'answer' AND cdrs.talktime > 0 AND custome\
rs.parent IN (7,42))
GROUP BY customers.id,SUBSTR(FROM_UNIXTIME(`cdrs`.`start`),1,7),outgroups.name_invoices
ORDER BY SUBSTR(FROM_UNIXTIME(`cdrs`.`start`),1,7),outgroups.name_invoices;");


$rows = array();

mysqli_stmt_bind_result($stmt, $row->name, $row->month, $row->name_invoices, $row->minutes, $row->calls);

while (mysqli_stmt_fetch($stmt)) {
$row->month = new DateTime($row->month.'-01 00:00:00');
$rows[] = $row;
$row = new stdClass();
mysqli_stmt_bind_result($stmt, $row->name, $row->month, $row->name_invoices, $row->minutes, $row->calls);

// Save collected rows into the cache
return $rows;

Your queries will now be cached after the first time you run them for the specified amount of time (TTL), and boom you’re done. If you require the update function in your service classes to purge the cache simply insert;

// To remove or invalidate in particular cache id, you can use the remove() method :

Read more about cache cleaning in the Zend Cache reference.

Hope this little article helps and please comment if you guys have better suggestions.
(Yes I know I can use APC & Memcached, but in this example I didnt have to 🙂 )

Danny Froberg

Connecting Flex 4 and RESTful Web Services using Zend Framework

David Flatley writes;

With Adobe’s latest incarnation of the Flex Framework and the Flash Builder integrated development environment (IDE), creating truly engaging front-end clients is now more streamlined. Some of the useful tools and features covered in this article are the Data/Services, Test Operation, and Network Monitor additions to Flash Builder. In this article, I explain how to set up a simple Representational State Transfer (REST) service using the Zend Framework 1.9 locally and connect to it in the Flex 4 application.

To get the most from this article, you should have a basic knowledge of the Zend Framework version 1.9. Development experience locally on your machine with Apache Server distributions like XAMPP, WAMP, or MAMP is helpful but not mandatory. You will need to deploy the server-side application on Apache running PHP. There is no database connectivity for this article.

Finally, you must have Flash Builder with PHP development tools installed or some flavor of the Eclipse IDE with the Flash Builder plug-in to complete the examples in this article.

Read the Full Story.