我需要在 Adobe Air 中创建 XML 日志文件。我的第一个想法是使用某种自动序列化。我找到了 FlexXB 库。我创建了简单的记录器，并以下列方式用注释标记了类
package loggingTools
{
[XmlClass]
[ConstructorArg(reference="timeStamp")]
[ConstructorArg(reference="item")]
[ConstructorArg(reference="action")]
[ConstructorArg(reference="arguments")]
[ConstructorArg(reference="success")]
[Bindable]
public class MessageAction
{
[XmlAttribute()]
public var timeStamp:Date;
[XmlAttribute()]
public var item:String;
[XmlAttribute()]
public var action:String;
[XmlAttribute()]
public var arguments:String;
[XmlAttribute()]
public var success:Boolean;
public function MessageAction(timeStamp:Date, item:String, action:String, arguments:String, success:Boolean) {
this.timeStamp = timeStamp;
this.item = item;
this.action = action;
this.arguments = arguments;
this.success = success;
}
}
我正在尝试序列化单个对象：
public class PlainXMLLogger
{
//private static var isStarted:Boolean;
private var logFile:XML;
[XmlArray(alias = "Log", type="loggingTools.MessageAction")]
[ArrayElementType("loggingTools.MessageAction")]
public var messages:Array;
public function addMessageAction(item:String, action:String, arguments:String, success:Boolean):void {
var newMessageAction:MessageAction;
newMessageAction = new MessageAction(new Date(), item, action, arguments, success);
messages.push(newMessageAction);
}
public function close():void {
var logXML:XML = FlexXBEngine.instance.serialize(messages);
trace(">> XML LOG ");
trace(logXML.toString() );
}
}
现在，序列化产生一个错误： TypeError: Error #1009: Cannot access a property or method of a null object reference。在 com.googlecode.flexxb.core::SerializationCore/serialize()
当然，我可以一个一个地序列化集合中的所有对象，但我认为这是一个坏主意。