AIR程序多开

AIR应用通常不能像QQ那样能进行多开操作。
为了让一个用AIR做的客户端能实现多任务，我找到得办法是运行程序时自动修改配置文件的id标签内的内容。
然后再关闭程序时又必须还原成原有的id，因为只有id一致才能实现更新功能。
主程序：multiapp.mxml

 

 

  <?xml version="1.0" encoding="utf-8"?>  

    <s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"   

                           xmlns:s="library://ns.adobe.com/flex/spark"   

                           xmlns:mx="library://ns.adobe.com/flex/mx"  

                           creationComplete="windowedapplication1_creationCompleteHandler(event)">  

        <fx:Script>  

            <![CDATA[  

                import flash.filesystem.File;  

                import flash.filesystem.FileMode;  

                import flash.filesystem.FileStream;  

                  

                import mx.events.FlexEvent;  

                import mx.formatters.DateFormatter;  

                  

                private var oldid:String;  

                private var reg:RegExp = /<id>.*<\/id>/;  

                  

                protected function windowedapplication1_creationCompleteHandler(event:FlexEvent):void  

                {  

                    var df:DateFormatter = new DateFormatter();  

                    df.formatString = "YYYYMMDDHHNNSS";  

                    var time:String = df.format(new Date());  

                    var newid:String = "<id>com.roy"+time+"</id>";  

                      

                    var f:File =new File(File.applicationDirectory.resolvePath(  

                        "META-INF/AIR/application.xml").nativePath);  

                    var fs:FileStream = new FileStream();    

                    fs.open(f,FileMode.READ);        

                    var str:String = new String(fs.readUTFBytes(fs.bytesAvailable));  

                    oldid = str.match(reg).toString();  

                    str = str.replace(reg,newid);    

                    fs.open(f,FileMode.WRITE);  

                    fs.writeUTFBytes(str);   

                    fs.close();  

                      

                    label.text = newid;  

                      

                    //有多个在运行的程序时只关闭一个运行程序就无法再打开新程序  

                    //必须监听系统最后一个相同程序关闭时，才能初始化id  

                    //解决办法：  

                    //记录运行前id,若为初始ID则在关闭该程序时初始化id,否则不操作  

                      

                    if(oldid == "<id>com.roy</id>")  

                    {  

                        this.addEventListener(Event.CLOSE,returnId);  

                    }  

                }  

                  

                protected function returnId(e:Event):void  

                {  

                    var f:File =new File(File.applicationDirectory.resolvePath(  

                        "META-INF/AIR/application.xml").nativePath);  

                    var fs:FileStream = new FileStream();    

                    fs.open(f,FileMode.READ);        

                    var str:String = new String(fs.readUTFBytes(fs.bytesAvailable));  

                    str = str.replace(reg,oldid);    

                    fs.open(f,FileMode.WRITE);  

                    fs.writeUTFBytes(str);   

                    fs.close();  

                }  

                  

            ]]>  

        </fx:Script>  

          

        <s:VGroup gap="20">  

            <s:Label text="已将配置文件id更改为：" color="0xff0000" fontSize="20"/>  

            <s:Label id="label" color="0x0000ff" fontSize="20"/>  

        </s:VGroup>  

    </s:WindowedApplication>  

 

此程序中配置文件multiapp-app.mxml中，id标签必须为<id>com.roy</id>。