Error #2123: Security sandbox violation: BitmapData.draw: cannot access null. No policy files granted access.
这里是一些示例代码:
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;
}
}
}
这只是一个用于解释的样本代码。在播放视频时调用getImage方法会导致错误。错误提到找不到策略文件。由于文件是本地加载的,因此实际上没有地方放置策略文件。是否需要设置任何策略设置或者当使用appendBytes时
BitmapData.draw
功能不可用?