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使用 Flash Builder 4.7、AIR 3.5、Flex 4.6.0（内部版本 23201）的最终版本，并运行/调试快速构建到运行 iOS 6.0.1 (10A523) 的 iPad2 MC981LL

我已经在我认为应该相当简单的事情上浪费了一天多的时间，但在这一点上，我完全不知所措。任何帮助表示赞赏。

我没有收到任何错误消息。运行后文件存在，但大小仅为 128 字节。不用说，除了 NULL 之外，它不能被读入任何东西。我什至在 writeObject 函数中实例化了一个 Object()，只是为了确保不是我的更复杂的对象导致了困难（为了简单起见，我暂时将 bitmapData 和 thumbnail 属性留空）。没有骰子。

除了我在对象中读回的尝试之外，我已经包含了所有相关代码。

不用说，它最初是一个具有读写功能的简单类，随着我尝试并尝试获取有关它失败原因的可用信息，它变得更加复杂。最初没有 trace 语句，没有自定义的 even 和 dispatcher，没有 try、catch、finally，也没有事件监听器，任何可以给我线索的东西。

另外，我可能做错了整个自定义事件/处理程序/侦听器/调度程序，因为让整个球滚动的类中的 statusMessage（底部的最后一个代码块）显示“将图像和缩略图保存到库”但从来没有“文件保存到库”

任何帮助是极大的赞赏。

这是我的踪迹：

[SWF] PictureToolsOnTheMoveMakeIt.swf - 4,154,904 bytes after decompression
FileSerializer FUNCTION writeObjectToFile()
FileStream.openAsync(write) finally
FileStream.writeError() finally

FileSerializer 类：

package classes
{
    import flash.events.Event;
    import flash.events.EventDispatcher;
    import flash.events.IEventDispatcher;
    import flash.events.IOErrorEvent;
    import flash.errors.*;
    import flash.filesystem.File;
    import flash.filesystem.FileMode;
    import flash.filesystem.FileStream;

    import events.FileSerializerEvent;

    import vo.PTotmImageVO;

    [Event(name = "writeComplete", type = "events.FileSerializerEvent")]
    [Event(name = "readComplete", type = "events.FileSerializerEvent")]

    public class FileSerializer extends EventDispatcher
    {
        private var fileStream:FileStream = new FileStream();

        public function FileSerializer(target:IEventDispatcher=null)
        {
            super(target);
        } // End CONSTRUCTOR FileSerializer

        public function writeObjectToFile(ptotmImageVO:PTotmImageVO, fnam    e:String):void
        {
            trace("FileSerializer FUNCTION writeObjectToFile()");
            var file:File = File.applicationStorageDirectory.resolvePath(ptotmImageVO.userid+"-"+ptotmImageVO.timestamp+".PTotmImageVO");

            fileStream.addEventListener(Event.CLOSE, close);
            fileStream.addEventListener(IOErrorEvent.IO_ERROR, ioErrorEventHandler);

            try
            {
                fileStream.openAsync(file, FileMode.WRITE);
            }
            catch (e:SecurityError)
            {
                // The file location is in the application directory, and the fileMode parameter is set to "append",
                // "update", or "write" mode.

                trace("FileStream.openAsync(write) SecurityError "+e);
            }
            finally
            {
                trace("FileStream.openAsync(write) finally");
            }

            try
            {
                fileStream.writeObject(ptotmImageVO);
            }
            catch (e:IOError)
            {
                // The file has not been opened; the file has been opened, but it was not opened with write capabilities;
                // or for a file that has been opened for synchronous operations (by using the open() method), the file
                // cannot be written (for example, because the file is missing).
                trace("FileStream.writeObject() IOError "+e);
            }           
            finally
            {
                trace("FileStream.writeObject() finally");
            }
        } // End FUNCTION writeObjectToFile

        protected function close(e:Event):void
        {
            trace("FileSerializer FUNCTION close()");
            dispatchEvent(new FileSerializerEvent(FileSerializerEvent.WRITE_COMPLETE, null,true,true));
        } // End FUNCTION close

        protected function ioErrorEventHandler(event:Event):void
        {
            trace("FileSerializer FUNCTION ioErrorEventHandler()");
        } // End FUNCTION ioErrorEventHandler

        public function readObjectFromFile(fname:String):Object
        {
            var file:File = File.applicationStorageDirectory.resolvePath(fname);

            if(file.exists)
            {
                var obj:Object;
                var fileStream:FileStream = new FileStream();
                fileStream.addEventListener(Event.COMPLETE, readComplete);
                fileStream.open(file, FileMode.READ);
                obj = fileStream.readObject();
                fileStream.close();
                return obj;
            }
            return null;
        } // End FUNCTION readObjectFromFile

        protected function readComplete(event:Event):void
        {
            dispatchEvent(new FileSerializerEvent(FileSerializerEvent.READ_COMPLETE, event.target));            
        } // End FUNCTION readComplete
    } // End CONSTRUCTOR FileSerializer
} // End PACKAGE classes

值对象类：

package vo
{
    import flash.display.BitmapData;

    [remoteClass(alias="PTotmImageVO")]

    public class PTotmImageVO
    {
        public var userid:String;
        public var thumbnail:BitmapData;
        public var image:BitmapData;
        public var timestamp:Number;
        public var description:String;
        public var type:String;

        public function PTotmImageVO()
        {

        } // End Constructor PTotmImageVO
    } // End Class PTotmImageVO
} // End Package vo

事件类 FileSerializerEvent：

package events
{
    import flash.events.Event;

    public class FileSerializerEvent extends Event
    {
        public static const WRITE_COMPLETE:String = "writeComplete";
        public static const READ_COMPLETE:String = "readComplete";

        public function FileSerializerEvent(type:String, data:*=null, bubbles:Boolean = true, cancelable:Boolean = true)
        {
            super(type, bubbles, cancelable);

            switch(type)
            {
                case WRITE_COMPLETE:
                    break;
                case READ_COMPLETE:
                    break;
            }
        }
    }
}

最后，我创建对象、实例化类并使用创建的对象调用类的 writeObjectToFile() 函数的代码：

            private var ptotmImageVO:PTotmImageVO = new PTotmImageVO();
            private var fileSerializer:FileSerializer = new FileSerializer();

            protected function createThumbnail():void
            {
                thumbBmpData = ImageResizer.bilinearIterative(bmpData, borderRect.width, borderRect.height, ResizeMath.METHOD_LETTERBOX , true, 3);

                saveImageToLibrary();
            }

            protected function saveImageToLibrary():void
            {
                statusMessage.text = "Saving Image and Thumbnail to Library...";

                ptotmImageVO.userid = parentApplication.userid;
                ptotmImageVO.description = "";
                ptotmImageVO.timestamp = new Date().getTime();
//              ptotmImageVO.thumbnail = thumbBmpData;
//              ptotmImageVO.image = bmpData;
                ptotmImageVO.type = "PictureTools - On The Move - Photo Entity";

                    fileSerializer.addEventListener(FileSerializerEvent.WRITE_COMPLETE, saveComplete);
                fileSerializer.writeObjectToFile(ptotmImageVO, ptotmImageVO.userid+"-"+ptotmImageVO.timestamp+".PTotmImageVO");
            }

            protected function saveComplete(event:FileSerializerEvent):void
            {
                statusMessage.text = "File Saved to Library";
            }

呃，好吧。还不如提供所有信息。这是我试图读取对象的类，因为我计划使用 itemRenderer 在平铺布局中显示它们（希望很快在 Apache Flex 4.9 中出现新的 DataGrid）...

<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" 
         xmlns:s="library://ns.adobe.com/flex/spark"
         creationComplete="drawBackground()"
         click="refreshFileListing()">

    <fx:Script>
        <![CDATA[
            import spark.components.VGroup;

            import classes.FileSerializer;          
            import events.FileSerializerEvent;
            import vo.PTotmImageVO;

            [Bindable]
            private var file:File = File.applicationStorageDirectory;
            [Bindable]
            private var directoryListing:String = new String();

            private var files:Array;
            private var fs:FileSerializer = new FileSerializer();


            public function refreshFileListing():void
            {               
                files = file.getDirectoryListing();

                trace("MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.nativePath -- "+file.nativePath);
                trace("MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.isDirectory -- "+file.isDirectory);
                trace("MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.name -- "+file.name);
                trace("MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.getDirectoryListing -- "+file.getDirectoryListing());
                trace("MyLibraryPhotoPanel FUNCTION refreshFileListing -- files.length -- "+files.length);

            var objects:Array = new Array();

                for (var i:uint = 0; i < files.length; i++)
                {
                    fs.addEventListener(FileSerializerEvent.READ_COMPLETE, fileReadComplete);

                    var f:String = files[i].name;
                    var o:PTotmImageVO = fs.readObjectFromFile(f) as PTotmImageVO;
                    objects.push(o); // Desperate at this point pretty much trying nonsense

                    trace("MyLibraryPhotoPanel FUNCTION refreshFileListing in for() -- o -- "+o);

                    // This is destined for an itemRenderer if ever I can get an object serialized to file and read back in.
//                  var b:BitmapData = o.thumbnail as BitmapData;
//
//                  var img:Image = new Image();
//                  img.source = b;
//
//                  var l:Label = new Label();
//                  l.text = files[i].name;
//
//                  var vg:VGroup = new VGroup();
//                  vg.addElement(img);
//                  vg.addElement(l);
//
//                  tg.addElement(vg);              

                    trace("MyLibraryPhotoPanel FUNCTION refreshFileListing in for()#1 -- count/name/size -- "+i+". "+files[i].name+" "+files[i].size+"bytes");
                }

                for(var k:uint = 0; k<objects.length; k++)
                {
                    trace("MyLibraryPhotoPanel FUNCTION refreshFileListing in for()#2 -- file object in Array -- "+k+". "+objects[k]);
                }
            } // End FUNCTION refreshFileListing

            protected function fileReadComplete(event:FileSerializerEvent):void
            {
                trace("MyLibraryPhotoPanel FUNCTION FileReadComplete");
            } // End FUNCTION fileReadComplete

            protected function drawBackground():void
            {
                with(graphics)
                {
                    beginFill(0xffffff,0);
                    drawRect(0,0,parent.width,parent.height);
                    endFill();
                }
            } // End FUNCTION drawBackground

        ]]>
    </fx:Script>
    <s:VGroup id="tg" height="100%" width="100%">
    </s:VGroup> 
</s:Group>

和跟踪输出：

[SWF] PictureToolsOnTheMoveMakeIt.swf - 4,152,506 bytes after decompression
FileSerializer FUNCTION writeObjectToFile()
FileStream.openAsync(write) finally
FileStream.writeObject() finally
FileSerializer FUNCTION writeObjectToFile()
FileStream.openAsync(write) finally
FileStream.writeObject() finally
MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.nativePath -- /var/mobile/Applications/926FFAF1-3FBE-4854-A61C-3BB8A3752D50/Library/Application Support/org.PictureTools.Apps.PictureToolsOnTheMoveMakeIt.debug/Local Store
MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.isDirectory -- true
MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.name -- Local Store
MyLibraryPhotoPanel FUNCTION refreshFileListing -- file.getDirectoryListing -- [object File],[object File]
MyLibraryPhotoPanel FUNCTION refreshFileListing -- files.length -- 2
MyLibraryPhotoPanel FUNCTION refreshFileListing in for() -- o -- null
MyLibraryPhotoPanel FUNCTION refreshFileListing in for()#1 -- count/name/size -- 0. 000000-1357831345565.PTotmImageVO 117bytes
MyLibraryPhotoPanel FUNCTION refreshFileListing in for() -- o -- null
MyLibraryPhotoPanel FUNCTION refreshFileListing in for()#1 -- count/name/size -- 1. 000000-1357831356829.PTotmImageVO 117bytes
MyLibraryPhotoPanel FUNCTION refreshFileListing in for()#2 -- file object in Array -- 0. null
MyLibraryPhotoPanel FUNCTION refreshFileListing in for()#2 -- file object in Array -- 1. null
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1 回答 1

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解决。Metadata 标记是 [RemoteClass... 而不是 [remoteClass，如我开始工作的示例代码中所示。由于编译器不检查这些标签，并且制作您自己的标签在技术上并不是错误，因此 - 永远 - 不会有任何诊断数据可以工作。

于 2013-01-22T20:00:53.957 回答