Load XML and text files from your HD into Flash with AS3 and PHP « Actionscript « Johannes Luderschmidt's Blog

Load XML and text files from your HD into Flash with AS3 and PHP

In this post I’ll show how to load a file with a file chooser dialog from your local HD into an Internet Flash application in your browser. In another post I’ve explained how to save a file to HD from Flash.

With a little workaround it is possible to load files into Flash in a way that it feels just as if you would do it with a common application: You are being asked with a standard system file dialog, which file you want to load in your application.

However, at first you have to park (i.e. upload) your file on a server in order to make it “publicly” available for your Flash app:

Figure 1: Howto save and load text files with AS3

But step by step. The procedure goes like this:

You open up a file browser in Flash.
The user chooses a file from your HD and clicks OK.
The file is being uploaded from your HD to the server.
Flash loads the file from the server in itself.

This code should do all the file handling in Flash for you:

private var fileRef:FileReference;
private const FILE_UPLOAD_URL:String = 
        "http://your-server.com/path/to/upload/flashUpload.php";
private const UPLOADED_XML_URL:String = 
        "http://your-server.com/path/to/upload/";
 
private function initializeFileRef():void{
    //FileReference allows you to open up system file chooser dialogs and 
    //to simply upload files on a webserver
    fileRef = new FileReference();
 
    //after a file has been chosen in the file chooser dialog the function 
    //fileSelected will be called.
    fileRef.addEventListener(Event.SELECT, fileSelected);
 
    //after the chosen file has been uploaded to the server the function 
    //uploadCompleted will be called
    fileRef.addEventListener(Event.COMPLETE, uploadCompleted);
}
 
/**
 * upload chosen file from file chooser dialog to server
 */
private function fileSelected(evt:Event):void {
	fileRef.upload(new URLRequest(FILE_UPLOAD_URL), "uploadFile");
}
 
/**
 * load uploaded file from server into flash
 */
private function uploadCompleted(evt:Event):void {
	var uploadedFileUrl:String = UPLOADED_XML_URL + fileRef.name;
	var message:String;
	var loader:URLLoader = new URLLoader();
	loader.addEventListener(Event.COMPLETE, downloadInFlashCompleted);
 
    loader.load(new URLRequest(uploadedFileUrl));
}
 
/**
 * file has been completely loaded into Flash. You can now do with it
 * whatever you want to do.
 */
private function downloadInFlashCompleted(evt:Event):void {
	trace(evt.target.data);
}

The script at http://your-server.com/path/to/upload/flashUpload.php should look like this:

<?php
move_uploaded_file($_FILES['uploadFile']['tmp_name'], 
    $_FILES['uploadFile']['name']);
#return something to flash. Otherwise the Event.Complete 
#listener will not trigger.
echo "somethingThatFlashGetsAResponseToItsRequest.";
?>

Download the Flash and the PHP example files.

This entry was posted on Thursday, July 30th, 2009 at 23:39 and is filed under Actionscript, Flash, flex. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One Response to “Load XML and text files from your HD into Flash with AS3 and PHP”

John says:

8 October 2010 at 11:00

Thank you for this post. I’ve looked all over the web and this was the only one tutorial that actually explained the thinking behind this.