如何发挥在动作脚本3使用的FLVPlayback之前检查FLV文件是否存在？ [英] How to check for the FLV file existence before playing that using FLVPlayback in Action Script 3?

问题描述

我很新的动作脚本，我使用了的FLVPlayback 类来播放我的FLV文件。

I'm very new to the Action Scripting, I'm using the FLVPlayback class to play my FLV files.

如果我想打哪个不存在尚未然后我得到一个一个FLV文件的VideoError：1000与的消息无法连接到服务器或找到FLV服务器上的。

If I'm trying to play a FLV file which is not existed yet then I am getting a "VideoError: 1000" with message of Unable to make connection to server or to find FLV on server.

我要检查使用该文件的URL或路径FLV文件存在，播放时通过FLV的FLVPlayback之前。任何人都可以请提出一个方法来做到这一点。

I want to check for the FLV file existence using the file URL or path, before playing that FLV by FLVPlayback. Can anybody please suggest a way to do that.

感谢

推荐答案

安全地捕获错误的唯一方法是将监听的 fl.video.VideoEvent.STATE_CHANGE 事件，并采取相应的行动。下面是关于如何做那么一点点code片断：

The only way to catch the error safely is to listen for the fl.video.VideoEvent.STATE_CHANGE event and act accordingly. Here's a little code snippet on how to do so:

import fl.video.FLVPlayback;
import fl.video.VideoEvent;
import fl.video.VideoState;

var videoPlayer:FLVPlayback;
videoPlayer.addEventListener( VideoEvent.STATE_CHANGE, onVideoStateChange );
/** Bad source  **/
videoPlayer.source = "http://www.helpexamples.com/flash/video/caption_video_error.flv";
/** Good source **/
//videoPlayer.source = "http://www.helpexamples.com/flash/video/caption_video.flv";

function onVideoStateChange( evt:VideoEvent ):void
{
    var videoPlayer:FLVPlayback = evt.target as FLVPlayback;
    switch( evt.state )
    {
        case VideoState.CONNECTION_ERROR:
            trace( 'Connection error' );
            /**
             * Once you hit this event, you should run some logic to do one or more of the following:
             *   1. Show an error message to the user
             *   2. Try to load another video
             *   3. Hide the FLVPlayback component
             */
            break;
        default:
            trace( 'Player is: ' + evt.state );
    }
}

有关可能VideoState常量的完整列表，请访问的 fl.video.VideoState 。

For a full list of possible VideoState constants, visit fl.video.VideoState.

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