flash air中读取本地文件的三种方法

actionscript中读取本地文件操作有两种代码如下

1.使用File和FileStream两个类，FileStream负责读取数据的所以操作:(同步操作)

var stream:FileStream = new FileStream();var file:File = new File('E:/test.txt');//绑定一个文件stream.open(file,FileMode.READ);//读取文件trace(stream.readMultiByte(stream.bytesAvailable,'utf-8'));stream.close();

稍微需要注意的一点是我们的File()函数里传的路径字符串，里面全都使用的是正斜杠，如果使用了反斜杠，你就会收到来自程序的错误。

2.仅File类(异步操作)

private var file:File;public function Tracer(){file = new File('E:/daili.txt');//绑定一个文件file.addEventListener(Event.COMPLETE,onComplete);file.load();//执行读取操作}private function onComplete(event:Event):void{var data:ByteArray = file.data;trace(data.readMultiByte(data.bytesAvailable,'utf-8'));}

3.使用File和FileStream(异步操作)

var sourceFile:File = File.documentsDirectory.resolvePath("Apollo Test/test.txt");var stream:FileStream = new FileStream();stream.addEventListener(Event.COMPLETE, readBytes);stream.openAsync(sourceFile, FileMode.READ);function readBytes(e:Event):void {var bytes:ByteArray = new ByteArray();trace("position 0:", stream.position); // 0bytes[0] = stream.readByte();trace("position 1:", stream.position); // 1fileStream.readBytes(bytes, stream.position, 4);trace("position 2:", stream.position); // 5stream.close();}