Shulou(Shulou.com)06/02 Report--

This article mainly shows you "how to solve the problem of Flex object persistence", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to solve the problem of Flex object persistence" this article.

About Flex object persistence

With regard to the serialization and persistence of Flex objects, many people think that objects cannot be copied to the server, but shallow copies can be done.

Let's look at an example like this:

Viewplaincopytoclipboardprint? Privatefunctiontest (): void {varcanvas:Canvas=newCanvas (); canvas.width=100; canvas.height=100; / / Save to ByteArray varb:ByteArray=newByteArray (); b.writeObject (canvas); / / fetch object b.positionroom0; varo:Object=b.readObject (); varc:Canvas=objectToInstance (o-canvas) asCanvas; trace (c.width); trace (c.height); this.addChild (c);}

◆ this example omits the process of saving to and fetching from the server, simply saves the Flex object, and then immediately takes out the object in the ByteArray. Because the ByteArray in the middle is immutable (that is, when the server-side type changes to byte [], the contents will not change), the intermediate process can be ignored.

The results of * are 100 and 100, indicating that the width and height of the Flex object are maintained.

Then add the server operation in the middle process, and the reason should be the same:

Viewplaincopytoclipboardprint? Privatefunctiontest (): void {varcanvas:Canvas=newCanvas (); canvas.width=100; canvas.height=100; / / Save to ByteArray varb:ByteArray=newByteArray (); b.writeObject (canvas); / / Save to server remoteObject.Save (b);}

Then on the server side:

Viewplaincopytoclipboardprint? PublicvoidSave (ByteArrayba) {/ / can be saved to the file FileStreamfs=newFileStream (Path,FileMode.Createm,FileAccess.Write); fs.Write (ba.GetBuffer (), 0pedagetBuffer () .length); fs.Close (); / / = / / or saved to the database newFlexObjectDAO (). Save (ba.GetBuffer);}

◆ like this, we can read the Flex object at any time and deal with it. I won't write the server-side reader, only the Flex part:

Viewplaincopytoclipboardprint? Privatefunctiontest (): void {/ / fetch the object remoteObject.Load ();} privatefunctionremoteObjectResult (event:ResultEvent): void {varb:ByteArray=eent.resultasByteArray; b.positionobject 0; varo:Object=b.readObject (); varc:Canvas=objectToInstance (orecogine canvas) asCanvas; trace (c.width); trace (c.height); this.addChild (c);}

By the same token, 100 and 100 can also be removed.

The contents of the objectToInstance method:

Viewplaincopytoclipboardprint? PublicstaticfunctionobjectToInstance (object:Object,clazz:Class): * {varbytes:ByteArray=newByteArray (); bytes.objectEncoding=ObjectEncoding.AMF0; varobjBytes:ByteArray=newByteArray (); objBytes.objectEncoding=ObjectEncoding.AMF0; objBytes.writeObject (object); vartypeInfo:XML=describeType (clazz); varfullyQualifiedName:String=typeInfo.@name.toString () .replace (/: /: /, "."); registerClassAlias (fullyQualifiedName,clazz); varlen:int=fullyQualifiedName.length; bytes.writeByte (0x10); / / 0x10isAMF0for "typedobject (classinstance)" bytes.writeUTF (fullyQualifiedName); bytes.writeBytes (objBytes,1) Bytes.position=0; varresult:*=bytes.readObject (); returnresult;} these are all the contents of the article "how to solve the problem of Flex object persistence". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.