Question

So I’ve created an Air app that saves to a custom file type. I’ve set up the file associations when I publish the app and, when you double click the file it opens the air app. What are the hooks for me to detect that the app has been opened via a file? Obviously, I need to detect this and then get the app to open the file itself.

Answer 1

Listen to the InvokeEvent which will hold into the arguments property the file name requested:

Quick mxml example:

<?xml version="1.0"?>
<mx:WindowedApplication
    xmlns:mx="http://www.adobe.com/2006/mxml"
    xmlns:s="spark.components.*"
    invoke="onAppInvoke(event);">
    <mx:Script><![CDATA[
      import mx.controls.Alert;

      private function onAppInvoke(event:InvokeEvent):void {
        if (event.arguments.length>0) {
           // ok app call with an arguments
           var fileName:String=event.arguments[0];
           Alert.show("app open with : "+fileName);
        } else {
           // app open normally
           Alert.show("normal launch");
        }
      }
     ]]></mx:Script>
</mx:WindowedApplication>