how to capture trace output of flex application?

Question

I have an Air application. It consist of an HTML component. I create a flex application and launch this application in HTML component of Air Application. I am able to capture the trace output of Air application but I can not capture trace output of flex application. As this flex application is launched in Air application's HTML component. I use vizy that output the log prints. How can I capture the trace output of flex web application. Thanks

Answer 1

One possible solution, use mx.logging.Log for debug traces and custom LogTarget to capture them.

It would go something like this. Declare the necessary objects:

private var logTarget:MyLogTarget= new MyLogTarget();
private var myLog:ILogger;  

Set up logging where you initialize the application:

myLog=Log.getLogger("MyApp");
Log.addTarget(logTarget);

Log stuff:

myLog.info("Something something.");
myLog.warn("This is weird!");
myLog.error("This shouldn't happen!");

The meat of the solution is the custom log target, MyLogTarget.as:

package 
{
    import mx.logging.LogEvent;
    import mx.logging.targets.LineFormattedTarget;

    public class MyLogTarget extends LineFormattedTarget
    {

        public var log:Vector.<String>=new Vector.<String>;

        public function MyLogTarget()
        {
            super();
        }

        override public function logEvent(event:LogEvent):void
        {
            trace(event.message);
            log.push(event.message+"\n");
        }
    }
}

This particular implementation just stores all traces in a vector of Strings, but you can modify it to save the log to disk, send it to a service, trace it on screen or whatever works for you.