flex 强制转换类型失败无法将object转换为XXX

错误描述

flex在加载module时报出如题所示的错误,

实际表现

问题就出现在这 我取消这个错误提示框 再次在前台查询数据 就一切ok

问题就出现在这一句

var zoufangModel:ZfRecord=ZfRecord(data);

调试

第一次是这样 继续就出抛出错误

取消错误再次查询 调试的结果就是这样

多了个[inherited] 确实第二次是正常的 但为什么第一次不行 到现在也不明白

解决方法

将错误的那一句改成

var zoufangModel:ZfRecord = ObjectTranslator.objectToInstance( data, ZfRecord ) as ZfRecord;

ObjectTranslator类的代码如下

/*

* Copyright (c) 2006 Darron Schall <[e-mail]>

*

* Permission is hereby granted, free of charge, to any person

* obtaining a copy of this software and associated documentation

* files (the "Software"), to deal in the Software without

* restriction, including without limitation the rights to use,

* copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the

* Software is furnished to do so, subject to the following

* conditions:

*

* The above copyright notice and this permission notice shall be

* included in all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

* OTHER DEALINGS IN THE SOFTWARE.

*/

package com.common.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 = [e-mail]().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

参考资料

http://blog.163.com/hongwei_benbear/blog/static/118395291201122612328768/