Flash CS6 - AS3 - 检查互联网连接是否完全无效

时间：2016-10-04 09:41:58

标签： actionscript-3 flash air

我在IOS和Android上都有一个adobe air应用程序。我在互联网上搜索过，看看如何检查设备是否连接到工作连接。最合乎逻辑的方式如下：
使用以下内容创建ConnectionChecker类：​​

package
{
    import flash.events.*;
    import flash.net.*;

    [Event(name="error", type="flash.events.Event")]
    [Event(name="success", type="flash.events.Event")]
    public class ConnectionChecker extends EventDispatcher
    {
        public static const EVENT_SUCCESS:String = "success";
        public static const EVENT_ERROR:String = "error";

        // Though google.com might be an idea, it is generally a better practice
        // to use a url with known content, such as http://foo.com/bar/mytext.txt
        // By doing so, known content can also be verified.

        // This would make the checking more reliable as the wireless hotspot sign-in
        // page would negatively intefere the result.
        private var _urlToCheck:String = "http://www.google.com";


        // empty string so it would always be postive
        private var _contentToCheck:String = "";    

        public function ConnectionChecker()
        {
            super();
        }

        public function check():void
        {
            var urlRequest:URLRequest = new URLRequest(_urlToCheck);
            var loader:URLLoader = new URLLoader();
            loader.dataFormat = URLLoaderDataFormat.TEXT;

            loader.addEventListener(Event.COMPLETE, loader_complete);
            loader.addEventListener(IOErrorEvent.IO_ERROR, loader_error);

            try
            {
                loader.load(urlRequest);
            }
            catch ( e:Error )
            {
                dispatchErrorEvent();
            }
        }

        private function loader_complete(event:Event):void
        {
            var loader:URLLoader = URLLoader( event.target );
            var textReceived:String = loader.data as String;

            if ( textReceived )
            {
                if ( textReceived.indexOf( _contentToCheck ) )
                {
                    dispatchSuccessEvent();
                }
                else
                {
                    dispatchErrorEvent();
                }
            }
            else
            {
                dispatchErrorEvent();
            }
        }

        private function loader_error(event:IOErrorEvent):void
        {
            dispatchErrorEvent();
        }


        private function dispatchSuccessEvent():void
        {
            dispatchEvent( new Event( EVENT_SUCCESS ) );
        }

        private function dispatchErrorEvent():void
        {
            dispatchEvent( new Event( EVENT_ERROR ) );
        }
    }
}

之后，每当我需要实际测试是否存在工作连接时，我都会执行以下操作：

                    var checker:ConnectionChecker = new ConnectionChecker();
                    checker.addEventListener(ConnectionChecker.EVENT_SUCCESS, checker_success);
                    checker.addEventListener(ConnectionChecker.EVENT_ERROR, checker_error);
                    checker.check();

适当的功能是：

private function checker_success(event:Event):void
{
    trace("U have cnx");
    continueTheGame.visible = true;
    // There is internet connection
}

private function checker_error(event:Event):void
{
    trace("U dn't have cnx");
    continueTheGame.visible = false;
    // There is no internet connection
}

以上所有答案均基于我在SO https://stackoverflow.com/a/13569775/5128351

上找到的此链接

现在的问题是，无论我是否有连接，我都会得到没有连接可用的结果。我错过了什么吗？

编辑：

我尝试将以下内容添加到xml文件中，但我仍然得到相同的结果：

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSExceptionDomains</key>
    <dict>
        <key>google.com</key>
        <dict>
            <!--Include to allow subdomains-->
            <key>NSIncludesSubdomains</key>
            <true/>
            <!--Include to allow HTTP requests-->
            <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
            <true/>
            <!--Include to specify minimum TLS version-->
            <key>NSTemporaryExceptionMinimumTLSVersion</key>
            <string>TLSv1.1</string>
        </dict>
    </dict>
</dict>

3 个答案:

答案 0 :(得分：1)

关于_contentToCheck字符串：

  

//空字符串，所以它总是正的   private var _contentToCheck:String = "";

我建议您检查加载的HTML源代码中的实际＆＃34; target＆＃34; 文本。这样，如果它存在，您可以确定至少Google已加载O.K（设备已连接）。

// check string of HTML to confirm web load was successful
private var _contentToCheck:String = "<!doctype html>"; //beginning of Google's HTML text


关于Check()功能

如果您在loader_complete事件中使用如下逻辑，会发生什么？

private function loader_complete(event:Event):void
{
    var loader:URLLoader = URLLoader( event.target );
    var textReceived:String = loader.data as String;

    if ( textReceived.length > 0 )
    {
        //index will be -1 if search text is not found (use IS NOT EQUAL to check this)
        if ( textReceived.indexOf( _contentToCheck ) != -1 )
        {
            dispatchSuccessEvent();
        }
        else
        {
            dispatchErrorEvent();
        }
    }
    else
    {
        dispatchErrorEvent();
    }
}

代码未经过编译器测试，但逻辑应该适合您自己的测试。希望能帮助到你。

使用代码示例编辑 ：

以下是我测试的两个代码（正确检测开/关互联网连接） 重新启用函数loader_complete中的那些跟踪以仔细检查任何内容。

（1） FLA与此Connect_test_01.as（主要AS类）相关联

package  
{
    import flash.display.MovieClip;
    import flash.events.*;

    import ConnectionChecker; 

    public class Connect_test_01 extends MovieClip 
    {
        public var checker:ConnectionChecker;

        public function Connect_test_01() 
        {
            checker = new ConnectionChecker();
            checker.addEventListener(ConnectionChecker.EVENT_SUCCESS, checker_success);
            checker.addEventListener(ConnectionChecker.EVENT_ERROR, checker_error);
            checker.check();
        }

        private function checker_success(event:Event):void
        {
            //# There is internet connection
            trace("-- YES - Net found.. You are connected");
            //continueTheGame.visible = true;
        }

        private function checker_error(event:Event):void
        {
            //# There is no internet connection
            trace("-- NO - Net not found... No connection");
            //continueTheGame.visible = false;
        }


    } //end Class

} //end Package

（2）这是上述代码导入中使用的ConnectionChecker.as。

package
{
    import flash.events.*;
    import flash.net.*;

    [Event(name="error", type="flash.events.Event")]
    [Event(name="success", type="flash.events.Event")]
    public class ConnectionChecker extends EventDispatcher
    {

        public var urlRequest:URLRequest;
        public var loaderA:URLLoader;
        public var loaderB:URLLoader;

        public var textReceived:String;

        public static const EVENT_SUCCESS:String = "success";
        public static const EVENT_ERROR:String = "error";

        // URL to connect for testing
        private var _urlToCheck:String = "https://www.google.com";

        // check string within HTML content to confirm web load was successful
        private var _contentToCheck:String = "<!doctype html>"; //beginning of Google's HTML text 

        public function ConnectionChecker()
        { super(); }

        public function check():void
        {
            urlRequest = new URLRequest(_urlToCheck);
            loaderA = new URLLoader();
            loaderA.dataFormat = URLLoaderDataFormat.TEXT;

            loaderA.addEventListener(Event.COMPLETE, loader_complete);
            loaderA.addEventListener(IOErrorEvent.IO_ERROR, loader_error);

            try { loaderA.load(urlRequest); }
            catch ( e:Error ) { dispatchErrorEvent(); }
        }

        private function loader_complete(event:Event):void
        {
            loaderB = URLLoader( event.target );
            textReceived = String(loaderB.data); // as String;

            //# check contents of load (should be HTML source-code)
            //trace ("STRING CHECK : " + "\n" + textReceived + "\n");

            //# minus-1 means Not Found. Should be Zero since Search Text is beginning
            //trace("Index of String : " + textReceived.indexOf( _contentToCheck ) + "\n" );

            if ( textReceived.length > 0 )
            {
                //index will be -1 if search text is not found (use IS NOT EQUAL to check this)
                if ( textReceived.indexOf( _contentToCheck ) != -1 )
                { dispatchSuccessEvent(); }
                else { dispatchErrorEvent(); }
            }
            else
            { dispatchErrorEvent(); }
        }

        private function loader_error(event:IOErrorEvent):void
        { dispatchErrorEvent(); }


        private function dispatchSuccessEvent():void
        { dispatchEvent( new Event( EVENT_SUCCESS ) ); }

        private function dispatchErrorEvent():void
        { dispatchEvent( new Event( EVENT_ERROR ) ); }
    }
}

答案 1 :(得分：0)

Adob​​e创建了一个URLMonitor类来处理这个问题。

http://help.adobe.com/en_US/air/reference/html/air/net/URLMonitor.html

http://www.infin8design.com/clients/stack/air.zip

答案 2 :(得分：0)

您是否已将现在需要的NSTransportSecurity XML添加到iOS应用描述符中？您需要指定要与之通信的所有域。

这是在iPhone节点内部。

<key>NSAppTransportSecurity</key>
<dict>
  <key>NSExceptionDomains</key>
  <dict>
    <key>google.com</key>
    <dict>
      <key>NSIncludesSubdomains</key>
      <true/>
      <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
      <true/>
    </dict>

    <key>another domain.com</key>
    <dict>
      <key>NSIncludesSubdomains</key>
      <true/>
      <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
      <true/>
    </dict>
  </dict>

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