AS3工作具有任意大的文件 [英] AS3 Working With Arbitrarily Large Files

问题描述

我想读在AS3一个非常大的文件时遇到的问题与运行时只是崩溃在我身上。我目前使用的是的FileStream 的开该文件异步。这并不适用于文件大于300MB左右的工作（崩溃没有一个例外）。

I am trying to read a very large file in AS3 and am having problems with the runtime just crashing on me. I'm currently using a FileStream to open the file asynchronously. This does not work(crashes without an Exception) for files bigger than about 300MB.

_fileStream = new FileStream();
_fileStream.addEventListener(IOErrorEvent.IO_ERROR, loadError);
_fileStream.addEventListener(Event.COMPLETE, loadComplete);
_fileStream.openAsync(myFile, FileMode.READ);

在仰望文档，这听起来像FileStream类仍试图读取整个文件到内存中（这是不好的大文件）

In looking at the documentation, it sounds like the FileStream class still tries to read in the entire file to memory(which is bad for large files).

有没有更适合的类用于读取大文件？我真的想这样的事情只能从将要下一个读取文件加载字节的缓冲FileStream类。

Is there a more suitable class to use for reading large files? I really would like something like a buffered FileStream class that only loads the bytes from the files that are going to be read next.

我期待，我可能需要写，做这对我来说一类，但我需要一次只能读取一张的文件。我假设我可以通过设置的FileStream的位置，并预读属性读一大块出文件中的时间做到这一点。我希望，以节省一些时间，如果有一类这样的已经存在。

I'm expecting that I may need to write a class that does this for me, but then I would need to read only a piece of a file at a time. I'm assuming that I can do this by setting the position and readAhead properties of the FileStream to read a chunk out of a file at a time. I would love to save some time if there is a class like this that already exists.

有没有处理在AS3大型文件的好方法，而无需加载整个内容到内存？

Is there a good way to process large files in AS3, without loading entire contents into memory?

推荐答案

不能创建了一个流，并读取字节块在给定的偏移，一大块的时间......这样：

Can't you create a stream, and read a chunk of bytes at a given offset, a chunk at a time... so:

function readPortionOfFile(starting:int, size:int):ByteArray
{
    var bytes:ByteArray ...
    var fileStream:FileStream ...    

    fileStream.open(myFile);
    fileStream.readBytes(bytes, starting, size);
    fileStream.close();

    return bytes;
}

，然后根据需要重复。我不知道这是如何工作的，并没有测试过，但我是在IM pression这个工作的。

and then repeat as required. I don't know how this works, and haven't tested it, but I was under the impression that this works.

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