In many case I want flash Images uploader form detect not just filesize or filename, but also can detect Image width and Height. So I can alert user to upload a correct Image size before start uploading. I know we can crop or resize Image with server script processing, but in some reason keep user to upload a correct Image size also a good choice. The idea of this class is to load the files locally as ByteArray, then after converted to BitmapData, we can get Image width and Height value.
package com.janumedia.util { import com.janumedia.event.CustomEventDispatcher; import flash.display.Bitmap; import flash.display.Loader; import flash.events.DataEvent; import flash.events.Event; import flash.events.IOErrorEvent; import flash.events.ProgressEvent; import flash.events.SecurityErrorEvent; import flash.net.FileReference; import flash.net.URLRequest; import flash.utils.ByteArray; /** * ... * @author I Nengah Januartha * @http://www.janumedia.com */ public class ImageUploader extends CustomEventDispatcher { public static const ERROR_FILENAME_CONTAIN_SPACE:String = "ErrorFileNameContainSpace"; public var name:String; public var data:ByteArray; public var size:Number; public var width:Number; public var height:Number; private var _fileRef:FileReference; private var _loader:Loader; private var _fileTypes:Array; public function ImageUploader () { super (); _fileRef = new FileReference (); _fileRef.addEventListener (Event.SELECT, handle_file_select, false, 0, true); _fileRef.addEventListener (Event.COMPLETE, handle_file_load, false, 0, true); _fileRef.addEventListener (IOErrorEvent.IO_ERROR, handle_file_upload_io_error, false, 0, true); _fileRef.addEventListener (SecurityErrorEvent.SECURITY_ERROR, handle_file_upload_security_error, false, 0, true); _fileRef.addEventListener (ProgressEvent.PROGRESS, handle_file_upload_progress, false, 0, true); _fileRef.addEventListener (DataEvent.UPLOAD_COMPLETE_DATA, handle_file_upload_complete, false, 0, true); _loader = new Loader (); _loader.contentLoaderInfo.addEventListener (Event.COMPLETE, handle_file_load_locally, false, 0, true); } public function browse (typeFilter:Array) : void { _fileRef.browse (typeFilter); } public function upload (url:URLRequest) : void { _fileRef.upload (url); } private function handle_file_select (e:Event) : void { // verify filename, filename with contain space will NOT allowed var regExp:RegExp = new RegExp (" ", "g"); if (regExp.exec (_fileRef.name)) { dispatchEvent (new Event (ERROR_FILENAME_CONTAIN_SPACE)); return; } name = _fileRef.name; size = _fileRef.size; // load locally and get file info _fileRef.load (); } private function handle_file_load (e:Event) : void { data = _fileRef.data; _loader.loadBytes (_fileRef.data); } private function handle_file_load_locally (e:Event) : void { width = Bitmap (e.target.content).bitmapData.width; height = Bitmap (e.target.content).bitmapData.height; dispatchEvent (new Event (Event.SELECT)); } private function handle_file_upload_io_error (e:IOErrorEvent) : void { dispatchEvent (new IOErrorEvent (IOErrorEvent.IO_ERROR)); } private function handle_file_upload_security_error (e:SecurityErrorEvent) : void { dispatchEvent (new SecurityErrorEvent (SecurityErrorEvent.SECURITY_ERROR)); } private function handle_file_upload_progress (e:ProgressEvent) : void { if (data) dispatchEvent (new ProgressEvent (ProgressEvent.PROGRESS)); } private function handle_file_upload_complete (e:DataEvent) : void { dispatchEvent (new DataEvent (DataEvent.UPLOAD_COMPLETE_DATA)); } } }
