我在使用闪光灯时出现此错误：
TypeError：错误＃1009：无法访问空对象引用的属性或方法。 在选项（）
这是我的选项类：
package {
import flash.display.MovieClip;
import fl.managers.StyleManager;
import flash.text.TextFormat;
import fl.events.ComponentEvent;
import fl.events.*;
import flash.events.MouseEvent;
import fl.controls.*;
import flash.net.SharedObject;
import flash.events.Event;
public class Options extends MovieClip
{
//DECLARE CLASS VARIABLES//
//DECLARE COMPONENT VARIABLES
private var cComponentFmt:TextFormat;
//DECLARE SAVE DATA VARIABLES
private var cPlayerData:Object;
private var cSavedGameData:SharedObject;
//DECLARE SOUND VARIABLES
public function Options()
{
//created the SharedObject using the getLocal() function
cSavedGameData = SharedObject.getLocal("savedPlayerData");
//set component formats
setComponents();
//initialize player's data
setPlayerData();
//set default message display upon entering the setup page
msgDisplay.text = "Introduce yourself to the fellow minions!";
//add event listeners
nameBox.addEventListener(MouseEvent.CLICK, clearName);
nameBox.addEventListener(ComponentEvent.ENTER, setName);
}
private function setComponents():void
{
//set the TextFormat for the components
cComponentFmt = new TextFormat();
cComponentFmt.color = 0x000000; //black colour
cComponentFmt.font = "Comic Sans MS"; //set default "Comic Sans MS"
cComponentFmt.size = 16;
//apply the new TextFormat to ALL the components
StyleManager.setStyle("textFormat", cComponentFmt);
}
private function setName(evt:ComponentEvent):void
{
trace("Processing text input box..");
// player pressed the ENTER key
cPlayerData.pName = nameBox.text;
msgDisplay.text = "Welcome, " + cPlayerData.pName + "! \nEnjoy many hours of fun with us!";
saveData();
}
private function clearName(evt:MouseEvent):void
{
// player CLICKED in the nameBox
nameBox.text = "";
}
private function setPlayerData():void
{
//all variables that relate to the player
cPlayerData = new Object();
//options related variables
cPlayerData.pName = "Papoi";
cPlayerData.sndTrack = "none";
//game related variables
cPlayerData.pScore = 0;
//save the player's data
saveData();
}
private function saveData():void
{
//savedPlayerData = cPlayerData is the name=value pair
cSavedGameData.data.savedPlayerData = cPlayerData;
//force Flash to update the data
cSavedGameData.flush();
//reload the newly saved data
loadData();
}
private function loadData():void
{
//gets the data stored in the SharedObject
//this particular line not found in the options.as
cSavedGameData = SharedObject.getLocal("savedPlayerData","/",false);
//now stores the save data in the player object
cPlayerData = cSavedGameData.data.savedPlayerData;
}
}
}
有谁知道为什么存在这个特殊错误？
而且，如果名称未在nameBox中输入，我想将cPlayerData.pName设为“Papoi”。我怎么做到这一点？ Cuz现在，我尝试将cPlayerData.pName默认设置为“Papoi”，但它不起作用。嗯..
答案 0 :(得分：1)
您的问题出现在构造函数中，因此当您尝试访问其中一个属性时，组件“msgDisplay”和/或组件“nameBox”尚未完全初始化... 一个好的做法是只有在完全初始化对象时才能访问它们，这可以使用事件“AddedToSatge”完成，在初始化所有子项之前不会触发该事件。 注意：即使它不是您问题的根源，也总是这样做是件好事，因为它可以避免您遇到与同一问题相关的其他问题和错误。
更新：
问题出在您的loadData()函数中，因为您更改了该函数体内的SharedObject的localPath（它与saveData()函数中使用的不同），然后是您加载的数据将始终为null，这是您在错误消息中看到的。你只需要从loadData函数中删除该行。请参阅下面的更新代码。
package
{
import flash.display.MovieClip;
import fl.managers.StyleManager;
import flash.text.TextFormat;
import fl.events.ComponentEvent;
import fl.events.*;
import flash.events.MouseEvent;
import fl.controls.*;
import flash.net.SharedObject;
import flash.events.Event;
public class Options extends MovieClip
{
//DECLARE CLASS VARIABLES//
//DECLARE COMPONENT VARIABLES
private var cComponentFmt:TextFormat;
//DECLARE SAVE DATA VARIABLES
private var cPlayerData:Object;
private var cSavedGameData:SharedObject;
//DECLARE SOUND VARIABLES
public function Options()
{
if (stage)
{
init();
}
else
{
addEventListener(Event.ADDED_TO_STAGE, init);
}
}
public function init(e:Event = null):void
{
// it is important to remove it coz you don't need it anymore:
removeEventListener(Event.ADDED_TO_STAGE, init);
//created the SharedObject using the getLocal() function
cSavedGameData = SharedObject.getLocal("savedPlayerData");
//set component formats
setComponents();
//initialize player's data
setPlayerData();
//set default message display upon entering the setup page
msgDisplay.text = "Introduce yourself to the fellow minions!";
//add event listeners
nameBox.addEventListener(MouseEvent.CLICK, clearName);
nameBox.addEventListener(ComponentEvent.ENTER, setName);
}
private function setComponents():void
{
//set the TextFormat for the components
cComponentFmt = new TextFormat();
cComponentFmt.color = 0x000000;//black colour
cComponentFmt.font = "Comic Sans MS";//set default "Comic Sans MS"
cComponentFmt.size = 16;
//apply the new TextFormat to ALL the components
StyleManager.setStyle("textFormat", cComponentFmt);
}
private function setName(evt:ComponentEvent):void
{
trace("Processing text input box..");
// player pressed the ENTER key
// remove the whitespace from the beginning and end of the name:
var playerNameWithoutSpaces:String = trimWhitespace(nameBox.text);
// check if the user did not enter his name then default name is "Papoi":
if (playerNameWithoutSpaces == "")
{
cPlayerData.pName = "Papoi";
}
else
{
cPlayerData.pName = nameBox.text;
}
//// This will replace the default message :
//// msgDisplay.text = "Welcome, " + cPlayerData.pName + "! \nEnjoy many hours of fun with us!";
// This will add the welcome message to the default message :
msgDisplay.text += "\nWelcome, " + cPlayerData.pName + "! \nEnjoy many hours of fun with us!";
saveData();
}
private function clearName(evt:MouseEvent):void
{
// player CLICKED in the nameBox
nameBox.text = "";
}
private function setPlayerData():void
{
//all variables that relate to the player
cPlayerData = new Object();
//options related variables
cPlayerData.pName = "Papoi";
cPlayerData.sndTrack = "none";
//game related variables
cPlayerData.pScore = 0;
//save the player's data
saveData();
}
private function saveData():void
{
//savedPlayerData = cPlayerData is the name=value pair
cSavedGameData.data.savedPlayerData = cPlayerData;
//force Flash to update the data
cSavedGameData.flush();
//reload the newly saved data;
loadData();
}
private function loadData():void
{
//gets the data stored in the SharedObject
//this particular line not found in the options.as
//// delete the next line, no need to set it every time :
//// cSavedGameData = SharedObject.getLocal("savedPlayerData","/",false);
//now stores the save data in the player object
cPlayerData = cSavedGameData.data.savedPlayerData;
}
//────────────────────────────────────────────
private function trimWhitespace($string:String):String
{
if ($string == null)
{
return "";
}
return $string.replace(/^\s+|\s+$/g, "");
}
//────────────────────────────────────────────
}
}