Flash / Flex / ActionScript/Development/Error

Handling Errors

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       try {
         trace("This code is about to throw an error.");
         throw new Error("A general error occurred.");
         trace("This line won"t run");
       }
       catch (errObject:Error) {
         trace("The catch block has been called.");
         trace("The message is: " + errObject.message);
       }
   }
 }

}

       </source>
   
  

Throw an exception from a method

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       try {
         trace("This code is about to throw an error.");
         displayMessage( "" );
         trace("This line won"t run");
       }
       catch (errObject:Error) {
         trace("The catch block has been called.");
         trace("The message is: " + errObject.message);
       }
   }
   private function displayMessage(message:String):void {
     if(message == undefined) {
       throw new Error("No message was defined.");
     }
     trace(message);
   }
 }

}

       </source>
   
  

Understanding Error Objects: throw new Error();

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sUsername:String = "";
       try {
         if(sUsername == "") {
           throw new Error("Missing Username.");
         }
       }
       catch (erObject:Error) {
         trace(erObject.message);  // Displays: Missing Username.
       }
   }
 }

}

       </source>