AS3 类型强转类_Object转VO

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看看darron schall?给我们带来的这个强制转换类：

?http://www.darronschall.com/weblog/archives/000247.cfm

用法：ObjectTranslator.objectToInstance(Object对象,要强转成的类型) as 要强转成的类型

嘿嘿，这回不用担心Object转VO转不成了。

源码：

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package com.goufang.util{import flash.net.ObjectEncoding;import flash.net.registerClassAlias;import flash.utils.ByteArray;import flash.utils.describeType;import flash.utils.getDefinitionByName;/** * Utility class to convert vanilla objects to class instances. */public final class ObjectTranslator{        /**     * Converts a plain vanilla object to be an instance of the class     * passed as the second variable.  This is not a recursive funtion     * and will only work for the first level of nesting.  When you have     * deeply nested objects, you first need to convert the nested     * objects to class instances, and then convert the top level object.     *      * TODO: This method can be improved by making it recursive.  This would be      * done by looking at the typeInfo returned from describeType and determining     * which properties represent custom classes.  Those classes would then     * be registerClassAlias'd using getDefinititonByName to get a reference,     * and then objectToInstance would be called on those properties to complete     * the recursive algorithm.     *      * @param object The plain object that should be converted     * @param clazz The type to convert the object to     */    public static function objectToInstance( object:Object, clazz:Class ):*    {        var bytes:ByteArray = new ByteArray();        bytes.objectEncoding = ObjectEncoding.AMF0;                // Find the objects and byetArray.writeObject them, adding in the        // class configuration variable name -- essentially, we're constructing        // and AMF packet here that contains the class information so that        // we can simplly byteArray.readObject the sucker for the translation                // Write out the bytes of the original object        var objBytes:ByteArray = new ByteArray();        objBytes.objectEncoding = ObjectEncoding.AMF0;        objBytes.writeObject( object );                        // Register all of the classes so they can be decoded via AMF        var typeInfo:XML = describeType( clazz );        var fullyQualifiedName:String = typeInfo.@name.toString().replace( /::/, "." );        registerClassAlias( fullyQualifiedName, clazz );                // Write the new object information starting with the class information        var len:int = fullyQualifiedName.length;        bytes.writeByte( 0x10 );  // 0x10 is AMF0 for "typed object (class instance)"        bytes.writeUTF( fullyQualifiedName );        // After the class name is set up, write the rest of the object        bytes.writeBytes( objBytes, 1 );                // Read in the object with the class property added and return that        bytes.position = 0;                // This generates some ReferenceErrors of the object being passed in        // has properties that aren't in the class instance, and generates TypeErrors        // when property values cannot be converted to correct values (such as false        // being the value, when it needs to be a Date instead).  However, these        // errors are not thrown at runtime (and only appear in trace ouput when        // debugging), so a try/catch block isn't necessary.  I'm not sure if this        // classifies as a bug or not... but I wanted to explain why if you debug        // you might seem some TypeError or ReferenceError items appear.        var result:* = bytes.readObject();        return result;    }    } // end class} // end package