有人可以帮助我吗？
我希望将文件从服务器端下载到客户端，而不会在服务器端发生任何更新时提示用户下载窗口。
现在我正在使用urlstream类，但是第一个文件正在下载部分下载完全剩余的文件内容。
修改
从其他帖子中获取的代码示例。警告：这是一个huuuge chunk 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>
答案 0 :(得分：0)
您需要提供更多详细信息。我甚至无法理解您是想要从服务器刷新数据还是想在未经用户许可的情况下下载文件。如果是前者，那么轮询就是最佳选择。对于后者，您可能也会关闭商店，因为没有人会使用不首先要求下载内容的应用程序。
.P
答案 1 :(得分：0)
我在同时发送多个请求时遇到了一些问题...例如，当尝试同时加载20个图像时，只有部分图像被正确接收。我不确定是什么导致这种情况，但我建议你尝试按顺序进行传输，因为它解决了我所有的问题。实际上，您可以将它们放在一个数组中，并在前一个数组完成时始终删除顶部数据。