Flash加载外部文件创建进度条3种方法

var connection_nc:NetConnection = new NetConnection();
对于此参数，必须传递 null
connection_nc.connect(null);
创建可用于通过指定的 NetConnection 对象播放 FLV 文件的流
var stream_ns:NetStream = new NetStream(connection_nc);
//指定将在舞台上的 Video 对象的边界内显示的视频流
my_video.attachVideo(stream_ns);
//播放外部视频 (FLV) 文件
stream_ns.play("http://www.helpexamples.com/flash/video/typing_short.flv");
//创建动态文本（显示进度）
this.createTextField("loaded_txt", this.getNextHighestDepth(), 10, 10, 160, 22);
//创建进度影片剪辑
this.createEmptyMovieClip("progressBar_mc", this.getNextHighestDepth());
//在进度影片剪辑中创建进度条
progressBar_mc.createEmptyMovieClip("bar_mc", progressBar_mc.getNextHighestDepth());
//画进度条
with (progressBar_mc.bar_mc) {
beginFill(0xFF0000);
moveTo(0, 0);
lineTo(100, 0);
lineTo(100, 10);
lineTo(0, 10);
lineTo(0, 0);
endFill();
_xscale = 0;
}
//在进度影片剪辑中创建进度框
progressBar_mc.createEmptyMovieClip("stroke_mc", progressBar_mc.getNextHighestDepth());
//画进度框
with (progressBar_mc.stroke_mc) {
lineStyle(0, 0x000000);
moveTo(0, 0);
lineTo(100, 0);
lineTo(100, 10);
lineTo(0, 10);
lineTo(0, 0);
}
//每隔一定时间就调用下面的checkBytesLoaded函数
var loaded_interval:Number = setInterval(checkBytesLoaded, 500, stream_ns);
function checkBytesLoaded(my_ns:NetStream) {
//进度值设置
var pctLoaded:Number = Math.round(my_ns.bytesLoaded / my_ns.bytesTotal * 100);
//动态文本显示进度
loaded_txt.text = Math.round(my_ns.bytesLoaded / 1000) " of " Math.round(my_ns.bytesTotal / 1000) " KB loaded (" pctLoaded "%)";
//进度条进行缩放
progressBar_mc.bar_mc._xscale = pctLoaded;
//加载完成后清除间隔
if (pctLoaded>=100) {
clearInterval(loaded_interval);
}
}