Plusieurs téléchargements en flex

Question

Quelqu'un peut-il m'aider? Je veux télécharger des fichiers du côté serveur vers le client sans demander à l'utilisateur une fenêtre à télécharger lorsque des mises à jour se produisent au niveau du serveur.

En ce moment j'utilise la classe urlstream mais le premier fichier télécharge complètement le reste du contenu des fichiers en téléchargement partiel.

modifier

Exemple de code provenant d'autres après. Attention: c'est un énorme code o'code.

<?xml version="1.0" encoding="utf-8"?> 
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" 
    xmlns:MyComp="client.components.*" layout="absolute" height="554" width="817" 
    backgroundGradientAlphas="[1.0, 0.0]" 
    backgroundGradientColors="[#ABA9A7, #03143B]" creationComplete="init();"> 

<mx:Script> 
<![CDATA[ 
    import flash.system.Capabilities; 
    import mx.collections.XMLListCollection; 
    import mx.rpc.Fault; 
    import mx.rpc.events.ResultEvent; 
    import mx.rpc.events.FaultEvent; 
    import mx.events.ListEvent; 
    import mx.collections.ArrayCollection; 
    import flash.data.SQLConnection; 
    import flash.errors.SQLError; 
    import flash.events.SQLErrorEvent; 
    import flash.events.SQLEvent; 
    import flash.filesystem.File; 
    import flash.errors.SQLError; 
    import mx.controls.Alert; 
    import mx.events.CloseEvent; 
    import flash.net.*; 
    import flash.filesystem.*; 
    import flash.events.OutputProgressEvent; 

    private var urlstring:String="server path"; 
    private var urlReq:URLRequest; 
    private var urlStream:URLStream; 
    private var fileData:ByteArray = new ByteArray(); 
    private var sqlConnection:SQLConnection =null; 
    private var sql:String; 
    private var result:SQLResult; 
    private var stmt:SQLStatement=null; 
    private var catid:int=0; 
    private var testcollection:Array=new Array(); 

    [Bindable] 
    private var DGArray:ArrayCollection = new ArrayCollection(testcollection); 
    private var number:int; 
    private var selection:Boolean=false; 
    private var timestamp:String; 
    private var xmlcol:XMLListCollection; 
    private var categoryid:int=0; 
    private var numbers:int; 
    private var index:int=0; 
    private var findex:int=0; 
    private var nupdates:int=0; 
    private var newfile:String=""; 
    private var selectstream:int=1; 
    private var startdownload:Boolean=false; 

    public function init():void{ 
     userRequest.send(null); 
     sqlConnection= new SQLConnection(); 
     //create a new db-file in the application storage location 
     var file:File = new File("app:/E-catalog.db"); 
     sqlConnection.addEventListener(SQLEvent.OPEN,dbOpenedHandler); 
     sqlConnection.addEventListener(SQLErrorEvent.ERROR,dbErrorHandler); 

     sqlConnection.open(file); 

     getData(); 
    } 

    public function loaded(event:Event):void { 
     urlStream.readBytes(fileData, 0, urlStream.bytesAvailable); 

     for(var x:int=0;x<nupdates;x++){ 
      var filename:Object=xmlcollection.getItemAt(x); 
      newfile=filename['pdfimage']; 
      writeAirFile(); 
     } 

    } 

    public function writeAirFile():void { 
     /* 
     var obj:Object=new Object; 
     startdownload=true; 
     var file:File = File.applicationStorageDirectory.resolvePath(newfile); 
     fileStream = new FileStream(); 

     fileStream.openAsync(file, FileMode.WRITE); 
     fileStream.writeBytes(fileData, 0, fileData.length); 
     fileStream.addEventListener(Event.COMPLETE,progressHandler,true,10,true); 

     for(var x:int=0;x<fileData.length;x++){} 

     startdownload=false; 
     fileStream.close(); 
     */ 
    } 

    public function progressHandler(event:Event){ 
     Alert.show("File downloading"); 
    } 

    public function dbOpenedHandler(event:SQLEvent):void{} 

    public function dbErrorHandler(error:SQLError):void{} 

    public function getData():void{ 
     sql = "SELECT STRFTIME('%Y-%m-%d %H:%M:%S',lupdated_dt)as lupdated_dt FROM update_mas where delflag=0 "; 
     stmt = new SQLStatement(); 
     stmt.sqlConnection = sqlConnection; 

     stmt.text = sql; 

     stmt.addEventListener(SQLEvent.RESULT, selectResult); 
     stmt.addEventListener(SQLErrorEvent.ERROR, selectError); 
     stmt.execute(); 
    } 

    public function selectResult(event:SQLEvent){ 
     DGArray.removeAll(); 
     number=1; 
     var result = stmt.getResult(); 
     var numRows = result.data.length; 

     for (var i = 0; i < numRows; i++){ 
      for(var col:String in result.data[i]){ 
       timestamp=result.data[i][col]; 
      } 
     } 

     updateRequest.url="serverpath ?time="+timestamp+""; 
     updateRequest.send(null); 
    } 

    public function selectError(event):void{ 
     stmt.removeEventListener(SQLEvent.RESULT, selectResult); 
     stmt.removeEventListener(SQLErrorEvent.ERROR, selectError); 
     Alert.show("SELECT error:"); 
    } 

    public function displayPOPUP(event:ResultEvent):void{ 
     nupdates=((int)(event.result)); 
     if(nupdates==0){ 
     }else{ 
      selection=Alert.show(""+nupdates+"Updates available", "UPDATES", Alert.YES|Alert.NO, this, alertClickHandler); 
     } 
    } 

    private function alertClickHandler(event:CloseEvent):void { 
     if (event.detail==Alert.YES){ 
      downloadRequest.url="serverpath ?time="+timestamp; 
      downloadRequest.send(null); 
     }else 
      Alert.show("download cancelled"); 
    } 

    public function displayResult(event:ResultEvent):void{ 
     var record:String=""; 
     sql=""; 
     for(index=0;index<xmlcollection.length;index++){ 
      var category:Object=xmlcollection.getItemAt(index); 
      sql="select Id FROM CATEGORY where delflag=0 and cat_name='"+category['catname']+"'"; 
      stmt = new SQLStatement(); 
      stmt.sqlConnection = sqlConnection; 
      stmt.text = sql; 
      stmt.addEventListener(SQLEvent.RESULT,checkRecord); 
      stmt.addEventListener(SQLErrorEvent.ERROR,checkError); 
      stmt.execute(); 
     } 
    } 

    public function checkRecord(event:Event):void{ 
     var category:Object=xmlcollection.getItemAt(index); 
     var path:String=""; 
     var result:SQLResult = stmt.getResult(); 
     if(result.data==null){ 
      var sql:String= "INSERT INTO CATEGORY (cat_name, created_user,created_dt,updated_user,updated_dt,image_jpg,image_pdf) "; 
      sql += "VALUES ('"+category['catname']+"',"; 
      sql +="'admin','"+category['cdate']+"','admin','"+category['udate']+"'"+category['pictimage']+"','"+category['pdfimage']+"')"; 
      stmt = new SQLStatement(); 
      stmt.sqlConnection = sqlConnection; 
      stmt.text = sql; 
      stmt.addEventListener(SQLEvent.RESULT,insertRecord); 
      stmt.addEventListener(SQLErrorEvent.ERROR,insertError); 

      stmt.execute(); 
     }else{ 
      sql=""; 
      sql="update CATEGORY set created_dt='"+category['cdate']+"', updated_dt='"+ category['udate']+"',image_jpg='"+category['pictimage']+"', image_pdf='"+category['pdfimage']+"' where delflag=0 and cat_name='"+category['catname']+"'"; 
      stmt = new SQLStatement(); 
      stmt.sqlConnection = sqlConnection; 
      stmt.text = sql; 
      stmt.addEventListener(SQLEvent.RESULT,updateResult); 
      stmt.addEventListener(SQLErrorEvent.ERROR,updateError); 
      stmt.execute(); 
     } 

     userRequest.send(null); 

     var ludt_dt:Object=xmlcollection.getItemAt((xmlcollection.length-1)); 
     timestamp=""; 
     timestamp=ludt_dt['udate']; 
     sql=""; 
     sql="update update_mas set lupdated_dt='"+timestamp+"' where delflag=0 "; 
     stmt = new SQLStatement(); 
     stmt.sqlConnection = sqlConnection; 
     stmt.text = sql; 
     stmt.addEventListener(SQLEvent.RESULT,updateResult); 
     stmt.addEventListener(SQLErrorEvent.ERROR,updateError); 
     stmt.execute(); 
     var temp:int=0; 
     for(var x:int=0;x<=xmlcollection.length-1;){ 
      var urlstring:String="http://sidssoldc:81/lessons/ravi/"; 
      var url:Object=xmlcollection.getItemAt(x); 
      urlstring+=url['pdfimage']; 
      path=url['pdfimage']; 
      while((path.indexOf('/',0)!=-1)){ 
       path=path.slice(path.indexOf('/',0)+1,path.length); 
      } 

      urlReq=new URLRequest(urlstring); 
      var filename:Object=xmlcollection.getItemAt(x); 
      var loader:URLLoader=new URLLoader(); 
      loader.dataFormat="binary"; 

      selectstream=2; 
      loader.load(urlReq); 

      loader.addEventListener(Event.COMPLETE,function(event:Event){ 
       var loader:URLLoader=(URLLoader)(event.target); 
       loader.dataFormat="binary"; 
       var ofstream2:FileStream= new FileStream(); 
       var ofstream1:FileStream= new FileStream(); 
       var ofstream3:FileStream= new FileStream(); 
       if(selectstream==1){ 
        var ofile1:File = File.applicationStorageDirectory.resolvePath('images/pdf/'+path); 
        ofstream1.openAsync(ofile1, FileMode.WRITE); 
        ofstream1.writeBytes(loader.data, 0, loader.bytesTotal); 
        selectstream++; 
       }else if(selectstream==2){ 
        ofstream1.close(); 
        var ofile2:File = File.applicationStorageDirectory.resolvePath('images/pdf/'+path); 
        ofstream2.openAsync(ofile2, FileMode.WRITE); 
        ofstream2.writeBytes(loader.data, 0, loader.bytesTotal); 
        selectstream++; 
       }else if(selectstream==3){ 
        ofstream2.close(); 
        var ofile3:File = File.applicationStorageDirectory.resolvePath('images/pdf/'+path); 
        ofstream3.openAsync(ofile3, FileMode.WRITE); 
        ofstream3.writeBytes(loader.data, 0, loader.bytesTotal); 
       } 

       if(selectstream==3){ 
        ofstream3.close(); 
       } 
      }); 

      x++; 

      temp=loader.bytesTotal; 

      checkStream.close(); 
     } 

     /*urlStream=new URLStream(); 
     urlStream.addEventListener(Event.COMPLETE, function(event:Event){ 

     urlStream.readBytes(fileData, 0, urlStream.bytesAvailable); 

     for(var x:int=0;x<nupdates;x++){ 
      var filename:Object=xmlcollection.getItemAt(x); 
      newfile=filename['pdfimage']; 
      var obj:Object=new Object; 
      startdownload=true; 
      var file:File = File.applicationStorageDirectory.resolvePath(newfile); 
      var fileStream:FileStream = new FileStream(); 

      fileStream.openAsync(file, FileMode.WRITE); 
      fileStream.writeBytes(fileData, 0, fileData.length); 
      fileStream.addEventListener(Event.COMPLETE,progressHandler,true,10,true); 

      for(var x:int=0;x<fileData.length;x++){ 
       startdownload=false; 
       fileStream.close(); 
      } 
     }); 

     urlStream.load(urlReq); 
     x++;*/ 
    } 

    public function insertRecord(event:Event):void{} 

    public function insertError(event:Event):void{} 

    public function updateResult(event:Event):void{} 

    public function updateError(event:Event):void{ 
     Alert.show("update failed"); 
    } 

    public function checkError(event:Event):void{ 
     Alert.show("error"); 
    } 
    public function showError(event:FaultEvent):void{ 
     Alert.show(""+event.fault); 
    } 

    public function itemClick(event:ListEvent):void{} 
]]> 
</mx:Script> 

<mx:DataGrid id="dgUserRequest" sortableColumns="false" x="99" y="115" width="364" textAlign="left" itemClick="itemClick(event);" rowHeight="30" doubleClickEnabled="false" height="297" themeColor="#ACF4F8" visible="true" editable="false" dataProvider="{catxmlcollection}" color="#000C0E" fontSize="11" > 
    <mx:columns> 
     <mx:DataGridColumn id="ID" headerText="Id" visible="false" dataField="catid" /> 
     <mx:DataGridColumn id="snumber" width="70" headerText="SerialNo" dataField="sno" visible="true" /> 
     <mx:DataGridColumn id="CATEGORY3" width="250" headerText="CATEGORY" dataField="catname" visible="true" /> 
    </mx:columns> 
</mx:DataGrid> 

<mx:XMLListCollection id="catxmlcollection" source="{userRequest.lastResult.categories.category}"/> 

<mx:HTTPService id="userRequest" url="http://192.168.10:81/lessons/ravi/cat.php" fault="showError(event);" useProxy="false" method="GET" resultFormat="e4x" /> 
<mx:HTTPService id="updateRequest" result="displayPOPUP(event);" fault="showError(event);" method="GET" > </mx:HTTPService> 

<mx:XMLListCollection id="xmlcollection" source="{downloadRequest.lastResult.Categories.Category}" /> 

<mx:HTTPService id="downloadRequest" result="displayResult(event);" fault="showError(event);" useProxy="false" method="GET" resultFormat="e4x" ></mx:HTTPService> 
<mx:HTTPService id="categoryRequest"></mx:HTTPService> 

<mx:Label x="216" y="53" text="Category Master" fontWeight="bold" fontSize="12" width="151"/> 

</mx:WindowedApplication> 

Answer 1

Vous devez fournir plus de détails. Je ne peux même pas comprendre si vous souhaitez actualiser les données du serveur ou télécharger des fichiers sans l'autorisation de l'utilisateur. Si c'est le premier, le scrutin est la voie à suivre. Pour ce dernier, vous pourriez aussi bien fermer boutique parce que personne ne va utiliser une application qui télécharge des choses sans demander d'abord.

.p

Answer 2

J'ai eu quelques problèmes lors de l'envoi de plusieurs demandes en même temps ... quand, par exemple, en essayant de charger vingt images en même temps que certains d'entre eux ont été reçus correctement. Je ne suis pas sûr de ce qui causait cela, mais je vous suggère d'essayer de faire les transferts dans une séquence, car il a résolu tous mes problèmes. En pratique, vous pouvez les mettre dans un tableau et toujours prendre et supprimer le top lorsque le précédent est terminé.