Flex 4.0/4.5 全局错误处理

Question

我正在尝试使用新的 AS3 全局错误处理类。我正在尝试在 Flex mxml 应用程序中使用它。我根本无法让它工作。下面是显示问题的完整程序。我将其设置为使用 Flash Player 10.2 并使用 Flex 4.5 SDK 进行编译。

我尝试过使用 Flex SDK 4.0 和 4.5，但在任何一种情况下都会出现错误。我一定在这里遗漏了一些明显的东西。这是将在网页上显示的普通 Flex SWF 文件。假设我可以导入 UncaughtErrorEvent，然后我会执行类似的操作来设置事件处理程序：

    if(systemManager.loaderInfo.hasOwnProperty("uncaughtErrorEvents")) {                   
        IEventDispatcher(
            systemManager.loaderInfo["uncaughtErrorEvents"]).addEventListener(
               "uncaughtError", uncaughtErrorHandler);
    }

这一切看起来都非常混乱，但我可以接受，除了它不起作用！我搜索过网络，但找不到任何文档或示例来解释如何在我的上下文中实现此功能。有什么建议吗？

完整程序：

    <?xml version="1.0" encoding="utf-8"?>
    <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
                   xmlns:s="library://ns.adobe.com/flex/spark" 
                   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" applicationComplete="onApplicationComplete();"
                   >
        <fx:Declarations>
            <!-- Place non-visual elements (e.g., services, value objects) here -->
        </fx:Declarations>
        <fx:Script>
            <![CDATA[
                private function onApplicationComplete() : void {
                    systemManager.loaderInfo.uncaughtErrorEvents.addEventListener("uncaughtError", uncaughtErrorHandler);
                }
                private function uncaughtErrorHandler(event:Event) : void {
                    trace(event.toString());
                }
            ]]>
        </fx:Script>
        <s:Button x="153" y="64" label="Trigger Error" id="triggerButton" click="throw new Error('myError')"/>
    </s:Application>

Answer 1

    <s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                           xmlns:s="library://ns.adobe.com/flex/spark" 
                           xmlns:mx="library://ns.adobe.com/flex/mx"
                           uncaughtError="uncaughtErrorHandler(event)" />

最简单的方法...

Answer 2

取自 API （我建议您仔细查看下次）：

<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                       xmlns:s="library://ns.adobe.com/flex/spark" 
                       xmlns:mx="library://ns.adobe.com/flex/halo"
                       applicationComplete="applicationCompleteHandler();">

    <fx:Script>
        <![CDATA[
            import flash.events.ErrorEvent;
            import flash.events.MouseEvent;
            import flash.events.UncaughtErrorEvent;

            private function applicationCompleteHandler():void
            {
                loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR, uncaughtErrorHandler);
            }

            private function uncaughtErrorHandler(event:UncaughtErrorEvent):void
            {
                if (event.error is Error)
                {
                    var error:Error = event.error as Error;
                    // do something with the error
                }
                else if (event.error is ErrorEvent)
                {
                    var errorEvent:ErrorEvent = event.error as ErrorEvent;
                    // do something with the error
                }
                else
                {
                    // a non-Error, non-ErrorEvent type was thrown and uncaught
                }
            }

            private function clickHandler(event:MouseEvent):void
            {
                throw new Error("Gak!");
            }
        ]]>
    </fx:Script>

    <s:Button label="Cause Error" click="clickHandler(event);"/>
</s:WindowedApplication>