如何使用带的BitmapData.draw NetStream.appendBytes？ [英] How can I use BitmapData.draw with NetStream.appendBytes?

问题描述

我使用NetStream.appendBytes（）来播放本地视频 Adob​​e AIR的（不涉及服务器）。我想用的BitmapData.draw（）带视频输出的图片，但我收到此错误：

I am using NetStream.appendBytes() to play a local video (no server involved) in Adobe AIR. I would like to use BitmapData.draw() to take a picture of the video output, but I am getting this error:

错误＃2123：安全沙箱冲突：的BitmapData.draw：无法访问空。没有策略文件授予访问权限。

Error #2123: Security sandbox violation: BitmapData.draw: cannot access null. No policy files granted access.

下面是一些示例code：

Here is some sample code:

package
{
    import flash.display.Sprite;
    import flash.filesystem.File;
    import flash.filesystem.FileMode;
    import flash.filesystem.FileStream;
    import flash.media.Video;
    import flash.net.NetConnection;
    import flash.net.NetStream;
    import flash.net.NetStreamAppendBytesAction;
    import flash.utils.ByteArray;
    import flash.display.BitmapData;

    class ByteArrayPlayer extends Sprite
    {
        private var _ns:NetStream;
        private var _nc:NetConnection;
        private var _video:Video;

        public function playVideo(path:String):void
        {
            _nc = new NetConnection();
            _nc.connect(null);
            _ns = new NetStream(_nc);

            _video = new Video();
            addChild(_video);
            _video.attachNetStream(_ns);

            _ns.play(null);
            _ns.appendBytesAction(NetStreamAppendBytesAction.RESET_BEGIN);

            var file:File = new File(path);
            var fileStream:FileStream = new FileStream();
            fileStream.open(file, FileMode.READ);

            var bytes:ByteArray = new ByteArray();

            fileStream.readBytes(bytes);

            _ns.appendBytes(bytes);
        }


        public function getImage(video:Video):BitmapData
        {
            var bit:BitmapData = new BitmapData(_video.width, _video.height);
            bit.draw(_video);            //This will cause the error
            return bit;
        }
    }
}

这是一个解释只样本code使用。调用getImage方法时，而播放视频时的错误会发生。在错误中提到找不到一个政策文件。由于加载该文件在本地没有一个真正的地方放一个策略文件。是否有需要设置或者是的BitmapData.draw 功能只是不可用时，使用一个策略设置的地方对appendBytes ？

This is only sample code use for an explanation. The error would happen when calling the getImage method while the video is playing. The error mentions a policy file not found. Since the file is loaded locally there isn't really a place to put a policy file. Is there a policy setting somewhere that needs to be set or is the BitmapData.draw feature just not available when using appendBytes?

推荐答案

我觉得另一种解决方案是使用 _ns.play（路径），而不是使用 _ns.appendBytes（）。

I think another solution is to use _ns.play(path) and not to use _ns.appendBytes().

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