Ionut Grosu

At last, my first tech post. : )

Here’s a way to ease the debugging into flex. I’ve created a simple class which takes advantage of the getStackTrace() method of the Error class and traces the calling function name before any debug message.

package com.ionutgrosu.logging
{
import mx.utils.ObjectUtil;
/**
 * @author Ionut Grosu ( http://www.flexwizz.com )
 * Simple Debug Util Class
 */
public final class Logger
{
	/**
	 * enable logging
	 */
	public static var isDebug : Boolean = true;

	/**
	 * Traces a message
	 * @param str
	 * @param introspect Set this to true if you want the 1st param to be introspected
	 */
	public static function log(str : * = '', introspect : Boolean = false):void
	{
		if(!isDebug) return;
		if(introspect) str = ObjectUtil.toString(str);

		trace(getCallingFunction(new Error())+ str);
	}
	/**
	 * @private
	 */
	private static function getCallingFunction(err:Error):String
	{
	return (err.getStackTrace().split("at ")[2].split("()")[0]+'()').replace('/',".") + "  ";
	}
}
}

You simply use it like Logger.log(”message”) and check the output. Should look similar to appName.componentId.blabla.functionName() “message”.

Of course, you can step in deeper and redirect the output to a custom log target, filter messages and so on. But I’ll come back on this with a more compressive code built on top of logging framework which needs a little cleanup.

Note that the getStackTrace() method is only available in the debug version of flash player so you should disable the logger class when exporting a release version. A single call to getStackTrace() will usually crash the application with no errors. So make sure that you set isDebug to false before any log() calls when releasing.

Cheers.