File upload in Flex + Ruby on Rails

Flex provides an API to upload and download a file. It uses the flash.net.FileReference class. Find the below code

Actionscript 3.0:

Call the "uploadFiles()" method to start uploading a file. Change the URLString variable to point to your controlle

// ActionScript file
   import flash.net.FileReference;
   import flash.net.URLRequestHeader;
 
   private var uploadFileRefList:FileReference = new FileReference();
   private var uploadURLReq:URLRequest;
   private var URLString:String="upload/attachment";

   private function uploadFiles():void
   {
       uploadFileRefList.addEventListener(Event.SELECT, uploadSelectHandler);
       try {
               var success:Boolean = uploadFileRefList.browse();
       } catch (error:Error) {
               trace("Unable to browse for files. " + error);
       }
   }
   private function doUpload(file:FileReference):void
   {
       uploadURLReq = new URLRequest(URLString);
       file.addEventListener(Event.COMPLETE, uploadCompleteHandler);
       file.addEventListener(IOErrorEvent.IO_ERROR, uploadIoErrorHandler);
       file.addEventListener(ProgressEvent.PROGRESS, uploadProgressHandler);
       try
       {
           file.upload(uploadURLReq);
       } catch (error:Error) {
           trace("Unable to upload file. " + error);
       }
   }
   private function uploadSelectHandler(event:Event):void
   {
       doUpload(uploadFileRefList);
   }
   private function uploadProgressHandler (event:ProgressEvent):void
   {
       upload_btn.enabled=false;
       trace(Math.floor((event.bytesLoaded/event.bytesTotal)*100) + "% complete");
   }
   private function uploadIoErrorHandler (event:Event):void
   {
       trace("Upload failed: " + event);
   }
   private function uploadCompleteHandler (event:Event):void
   {
       upload_btn.enabled=true;
       trace("Upload successfull: ");
   }

Ruby on Rails:

Create a controller "upload" and place the below code

   def attachment
     render(:xml => "") if saveFileAttachment(params[:Filedata],params[:Filename].to_s)
end

Then create a helper method "saveFileAttachment"

def saveFileAttachment(pFile,pFileName)
vFilePath = "public/"+pFileName
return false unless File.open(vFilePath, "wb") { |vBuffer| vBuffer.write(pFile.read) }
return true
end