类型错误:错误 #1009:无法访问空对象引用的属性或方法 [英] TypeError: Error #1009: Cannot access a property or method of a null object reference
问题描述
当我启动应用程序时出现此错误(闪存类型为全部关闭并继续)并且我没有想法:
I get this error when i launch the application(flash type with dismiss all and continue) and i'm out of ideas:
类型错误:错误 #1009:无法访问空对象的属性或方法参考.在Magazin/xmlService_resultHandler()[D:\Documents和 Settings\chechu\Adobe Flash生成器 4\Magazin\src\Magazin.mxml:41]在杂志/__xmlService_result()[D:\Documents和 Settings\chechu\Adobe Flash生成器 4\Magazin\src\Magazin.mxml:64]在flash.events::EventDispatcher/dispatchEventFunction()在flash.events::EventDispatcher/dispatchEvent()在HTTPOperation/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\http\HTTPService.as:989]在mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:318]在mx.rpc::Responder/result()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\Responder.as:56]在mx.rpc::AsyncRequest/acknowledge()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:84]在DirectHTTPMessageResponder/completeHandler()[E:\dev\4.x\frameworks\projects\rpc\src\mx\messaging\channels\DirectHTTPChannel.as:446]在flash.events::EventDispatcher/dispatchEventFunction()在flash.events::EventDispatcher/dispatchEvent()在 flash.net::URLLoader/onComplete()
TypeError: Error #1009: Cannot access a property or method of a null object reference. at Magazin/xmlService_resultHandler()[D:\Documents and Settings\chechu\Adobe Flash Builder 4\Magazin\src\Magazin.mxml:41] at Magazin/__xmlService_result()[D:\Documents and Settings\chechu\Adobe Flash Builder 4\Magazin\src\Magazin.mxml:64] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at HTTPOperation/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\http\HTTPService.as:989] at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:318] at mx.rpc::Responder/result()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\Responder.as:56] at mx.rpc::AsyncRequest/acknowledge()[E:\dev\4.x\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:84] at DirectHTTPMessageResponder/completeHandler()[E:\dev\4.x\frameworks\projects\rpc\src\mx\messaging\channels\DirectHTTPChannel.as:446] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.net::URLLoader/onComplete()
主要应用:
import events.ProductEvent;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.events.FlexEvent;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import valueObject.ImageClass;
[Bindable]
public var imagesCollection:ArrayCollection;
protected function xmlService_faultHandler(event:FaultEvent):void
{
Alert.show("meeah");
}
protected function xmlService_resultHandler(event:ResultEvent):void
{
var imageCollection:ArrayCollection=event.result.Images.image ;
var imData:ImageClass;
for each(var im:Object in imageCollection)
{
imData=new ImageClass();
imData.url=im.url;
imData.big_url=im.big_url;
imData.cat=im.cat;
imData.descript=im.descript;
imData.price=im.price;
imagesCollection.addItem(imData); line:41
}
Alert.show("gg");
}
[Bindable]
public var mama:ArrayCollection=new ArrayCollection();
protected function gallery1_addToCartHandler(event:ProductEvent):void
{
mama.addItem(event);
currentState="cart";
}
]]>
</fx:Script>
<s:states>
<s:State name="normal"/>
<s:State name="cart"/>
</s:states>
<fx:Declarations>
<s:HTTPService id="xmlService" line 64
url="dataXml/pics.xml" fault="xmlService_faultHandler(event)"
result="xmlService_resultHandler(event)"/>
</fx:Declarations>
<components:Gallery imagesArray="{imagesCollection}" addToCart="gallery1_addToCartHandler(event)" />
<components:cart x="500" y="300" itemRenderer="components.CartRenderer" dataProvider="{mama}" />
</s:Application>
图库组件:
<?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"
xmlns:mx="library://ns.adobe.com/flex/mx" >
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Metadata>
[Event(name="addToCart",type="events.ProductEvent")]
</fx:Metadata>
<s:layout>
<s:VerticalLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import events.ProductEvent;
import mx.collections.ArrayCollection;
import valueObject.ImageClass;
[Bindable]
public var imagesArray:ArrayCollection;
public function goa_clickHandler(event:MouseEvent):void
{
for (var i:uint=0; i<imagesArray.length;i++)
{
var objEvent:ProductEvent=new ProductEvent("addToCart",true);
objEvent.imData=imagesArray[i] ;
dispatchEvent(objEvent);
}
}
]]>
</fx:Script>
<s:SkinnableDataContainer id="cont" dataProvider="{imagesArray}">
<s:itemRenderer >
<fx:Component>
<s:ItemRenderer>
<s:HGroup>
<s:Label id="gagal" text="{data.price}"/>
<mx:Image source="{data.url}" width="50" height="50" />
<s:Button id="goa" label="buy" click="outerDocument.goa_clickHandler(event)"/>
</s:HGroup>
</s:ItemRenderer>
</fx:Component>
</s:itemRenderer>
</s:SkinnableDataContainer>
</s:Group>
ProductEvent 类:
The ProductEvent class:
package events
{
import flash.events.Event;
import valueObject.ImageClass;
[Bindable]
public class ProductEvent extends Event
{
public var imData:ImageClass;
public function ProductEvent(type:String,bubbles:Boolean=true)
{
super(type,bubbles);
}
override public function clone():Event
{
var eventOb:ProductEvent=new ProductEvent(type,bubbles);
eventOb.imData=this.imData;
return eventOb;
}
}
图像类:
package valueObject
{
[Bindable]
public class ImageClass
{
public var url:String;
public var big_url:String;
public var descript:String;
public var price:String;
public var cat:String;
public function ImageClass()
{
/*this.url=url;
this.big_url=big_url;
this.descript=descript;
this.price=price;
this.cat=cat;*/
}
}
}
和xml:
<?xml version="1.0"?>
<Images>
<image>
<url>poze/pics/IMG_1163.jpg</url>
<big_url>poze/big_pics/IMG_1163.jpg </big_url>
<descript>P</descript>
<price>99.99</price>
<cat>A</cat>
</image>
<image>
<url>poze/pics/IMG_1175.jpg</url>
<big_url>poze/big_pics/IMG_1175.jpg</big_url>
<descript>U</descript>
<price>99.99</price>
<cat>A</cat>
</image>
<image>
<url>poze/pics/IMG_1186.jpg</url>
<big_url>poze/big_pics/IMG_1186.jpg</big_url>
<descript>L</descript>
<price>99.99</price>
<cat>A</cat>
</image>
推荐答案
您正在访问第 41 行中的 imagesCollection 变量，但尚未对其进行初始化 - 它仍然包含 null
You're accessing imagesCollection variable in line 41, but haven't initialized it - it still contains null
要么改变
[Bindable]
public var imagesCollection:ArrayCollection;
到
[Bindable]
public var imagesCollection:ArrayCollection = new ArrayCollection();
或添加
imagesCollection = new ArrayCollection();
到 xmlService_resultHandler 方法的开头.
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