Sending image data from Flash to PHP. Help!
I want to allow the user of a flash movie to display on the browser (or to force download) an image within a Sprite, as a JPG image/file.
I started from a pre-made class located on sephiroth.it:
http://www.sephiroth.it/tutorials/fl.../print_screen/
but as this code was made in AS2, I decided to create my own AS3 class based on this one, and the result I get on the browser is a one pixel column of 1x300 pixels (the sprite size is 300x300). For some reason, the data passed from Flash to PHP is not processed right.
This is the code I made:
JPGExporter class (JPGExporter.as):
PHP Code:
package {
import flash.display.BitmapData;
import flash.geom.Rectangle;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.utils.Timer;
import flash.events.TimerEvent;
import EventImgProcess; // custom event class for events of image processing
import flash.events.EventDispatcher;
import flash.display.DisplayObject;
import flash.net.URLVariables;
public class JPGExporter extends EventDispatcher {
private var timer:Timer = new Timer(5);
public var record:URLVariables; // used to stored all the data to send
private var _container:DisplayObject;
private var bmp:BitmapData;
public function JPGExporter(container:DisplayObject, x:Number, y:Number, w:Number, h:Number) {
_container = container as DisplayObject;
bmp = new BitmapData(w, h, false);
record = new URLVariables();
record.width = w;
record.height = h;
record.col = 0;
record.row = 0;
var matrix:Matrix = new Matrix();
matrix.translate(-x, -y);
bmp.draw(container, matrix, new ColorTransform(), null, new Rectangle(0, 0, w, h));
timer.addEventListener(TimerEvent.TIMER, copySource);
timer.start();
}
private function copySource(e:TimerEvent):void {
var pixel:Number;
var str_pixel:String;
record["px" + record.row] = new Array();
// Get row specified by row property of record (URLVariables)
for (var a:uint = 0; a < bmp.width; a++) {
pixel = bmp.getPixel(a, record.row);
str_pixel = pixel.toString(16);
if (pixel == 0xFFFFFF) str_pixel = ""; // don't send blank pixels
record["px" + record.row].push(str_pixel);
}
record.row += 1;
if (record.row >= bmp.height) {
timer.stop();
// trigger the complete event and pass through it the processed data in order to send it
dispatchEvent(new EventImgProcess(EventImgProcess.IMAGE_COMPLETE, record));
bmp.dispose();
}
}
}
}
Code in the FLA file (test.fla):
PHP Code:
imageProcess = new JPGExporter(mySprite, 0, 0, mySprite.width, mySprite.height);
imageProcess.addEventListener(EventImgProcess.IMAGE_COMPLETE, onImageComplete);
function onImageComplete(e:EventImgProcess):void {
var variables:URLVariables = e.variables as URLVariables; // I get the URLVariables instance containing all the data through my custom event
var request:URLRequest = new URLRequest("http://localhost/.../pixels2JPG.php");
request.method = URLRequestMethod.POST;
request.contentType = "application/x-www-form-urlencoded";
request.data = variables;
trace("Image processing complete");
navigateToURL(request, "_blank");
}
And the PHP (pixels2JPG.php):
PHP Code:
<?php
error_reporting(0);
/**
* Get the width and height of the destination image
* from the POST variables and convert them into
* integer values
*/
$w = (int)$_POST['width'];
$h = (int)$_POST['height'];
// create the image with desired width and height
$img = imagecreatetruecolor($w, $h);
// now fill the image with blank color
// do you remember i wont pass the 0xFFFFFF pixels
// from flash?
imagefill($img, 0, 0, 0xFFFFFF);
$rows = 0;
$cols = 0;
// now process every POST variable which
// contains a pixel color
for($rows = 0; $rows < $h; $rows++){
// convert the string into an array of n elements
$c_row = explode(",", $_POST['px' . $rows]);
for($cols = 0; $cols < $w; $cols++){
// get the single pixel color value
$value = $c_row[$cols];
// if value is not empty (empty values are the blank pixels)
if($value != ""){
// get the hexadecimal string (must be 6 chars length)
// so add the missing chars if needed
$hex = $value;
while(strlen($hex) < 6){
$hex = "0" . $hex;
}
// convert value from HEX to RGB
$r = hexdec(substr($hex, 0, 2));
$g = hexdec(substr($hex, 2, 2));
$b = hexdec(substr($hex, 4, 2));
// allocate the new color
// N.B. teorically if a color was already allocated
// we dont need to allocate another time
// but this is only an example
$test = imagecolorallocate($img, $r, $g, $b);
// and paste that color into the image
// at the correct position
imagesetpixel($img, $cols, $rows, $test);
}
}
}
// print out the correct header to the browser
header("Content-type:image/jpeg");
// display the image
imagejpeg($img, "", 90);
?>
What do you think is going wrong?
