在使用 asc2 编译 AIR 应用程序后,我发现在捕获 UncaughtErrorEvent 时缺少错误堆栈跟踪。
示例代码如下:
var root:Sprite = this;
root.loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR,errorHandle);
throw new Error("test");
protected function errorHandle(event:UncaughtErrorEvent):void
{
var message:String;
if (event.error is Error) {
message = Error(event.error).message;
message+="\n"+Error(event.error).getStackTrace();
} else if (event.error is ErrorEvent) {
message = ErrorEvent(event.error).text;
} else {
message = event.error.toString();
}
}
在使用 ASC1 时,我可以在错误句柄中看到完整的堆栈跟踪。但是使用 ASC2,只是一个空的堆栈跟踪。
有人遇到同样的问题吗?
如何获取 UncaughtErrorEvent 堆栈跟踪?
最佳答案
不要将 event.error
转换为 Error
,如:
Error(event.error).getStackTrace()
获取错误的堆栈跟踪会返回错误构造时错误的调用堆栈作为字符串。请注意,堆栈跟踪的行号是强制转换的行。
相反,从 event.error
调用 getStackTrace()
,如:
event.error.getStackTrace()
根据您的示例,堆栈上没有任何重要信息。
添加递归有助于证明问题:
package
{
import flash.display.Sprite;
import flash.events.UncaughtErrorEvent;
public class ExceptionTest extends Sprite
{
public function ExceptionTest()
{
super();
loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR, uncaughtErrorHandler);
recursion();
}
protected function recursion(depth:uint=0):void
{
if (depth == 5)
throw new Error("test");
else
recursion(++depth);
}
protected function uncaughtErrorHandler(event:UncaughtErrorEvent):void
{
trace(event.error.getStackTrace());
}
}
}
...会产生:
Error: test
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:19]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:13]
[SWF] Users:jsturges:dev:flash-workspace:X:bin-debug:ExceptionTest.swf - 1,745 bytes after decompression
Error: test
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:19]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:13]
如果 uncaughtErrorHandler()
更改为您的示例转换为 Error
,如:
protected function uncaughtErrorHandler(event:UncaughtErrorEvent):void
{
trace(Error(event.error).getStackTrace());
}
调试器捕获异常,但 getStackTrace
是强制转换行:
Error: test
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:19]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest/recursion()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:21]
at ExceptionTest()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:13]
[SWF] Users:jsturges:dev:flash-workspace:X:bin-debug:ExceptionTest.swf - 1,519 bytes after decompression
Error: Error: test
at ExceptionTest/uncaughtErrorHandler()[/Users/jsturges/dev/flash-workspace/X/src/ExceptionTest.as:26]
从 Flash Player 10.1 开始,将 AS1 和 AS2 编码到支持 UncaughtErrorEvent
的 AS3 也可能存在细微差别。
除此之外,确保每个 ActionScript 版本都有适当的调试播放器。在运行时的非调试器版本中,Error.getStackTrace()
方法返回 null
。
关于actionscript-3 - ActionScript 编译器 UncaughtErrorEvent,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16073357/