FileReference.save() 复制 ByteArray [英] FileReference.save() duplicates ByteArray

问题描述

我在使用 FileReference.save() 时遇到了内存问题.我的 Flash 应用程序实时生成大量数据，需要将这些数据保存到本地文件.据我了解，Flash 10(与 AIR 相对)不支持流式传输到文件.但是，更糟糕的是 FileReference.save() 在保存之前复制了所有数据.我正在寻找解决这种内存使用量翻倍的方法，并考虑了以下方法:

I've encountered a memory problem using FileReference.save(). My Flash application generates of a lot of data in real-time and needs to save this data to a local file. As I understand, Flash 10 (as opposed to AIR) does not support streaming to a file. But, what's even worse is that FileReference.save() duplicates all the data before saving it. I was looking for a workaround to this doubled memory usage and thought about the following approach:

如果我将 ByteArray 的自定义子类作为参数传递给 FileReference.save()，那么这个 ByteArray 子类将覆盖所有 read*() 方法.重写的 read*() 方法将等待我的应用程序生成一条数据，返回这条数据并立即将其从内存中删除.我知道将生成多少数据，因此我还可以覆盖 length/bytesAvailable 方法.

What if I pass a custom subclass of ByteArray as an argument to FileReference.save(), where this ByteArray subclass would override all read*() methods. The overridden read*() methods would wait for a piece of data to be generated by my application, return this piece of data and immediately remove it from the memory. I know how much data will be generated, so I could also override length/bytesAvailable methods.

有可能吗?你能给我一些提示怎么做吗?我创建了一个 ByteArray 的子类，为它注册了一个别名，将这个子类的一个实例传递给 FileReference.save()，但不知何故 FileReference.save() 似乎把它当作一个 ByteArray 实例来对待，而不是调用我覆盖的任何方法...

Would it be possible? Could you give me some hint how to do it? I've created a subclass of ByteArray, registered an alias for it, passed an instance of this subclass to FileReference.save(), but somehow FileReference.save() seems to treat it just as it was a ByteArray instance and doesn't call any of my overridden methods...

非常感谢您的帮助！

推荐答案

这是一个有趣的想法.也许一开始，您应该只在扩展的 ByteArray 中添加跟踪，以查看 FileReference#save() 内部如何运行.

It's an interesting idea. Perhaps to start you should just add traces in your extended ByteArray to see how the FileReference#save() functions internally.

如果它有某种

while( originalByteArray.bytesAvailable ) 
  writeToSaveBuffer( originalByteArray.readByte() );

功能覆盖可以像您说的那样在每次读取时截断原始缓冲区，例如:

functionality the overrides could just truncate the original buffer on every read like you say, something like:

override function readByte() : uint {
  var b : uint = super.readByte();
  // Truncate the bytes (assuming bytesAvailable = length - removedBytes)
  length = length - bytesAvailable;
  return b;
}

另一方面，如果这现在有效，我猜原始字节数组在应用程序中以后将不再可用.

On the other hand, if this now works I guess the original byte array would not be available afterwards in the application anymore.

(我自己没有测试过，截断可能需要比示例更多的工作)

(i havn't tested this myself, truncating might require more work than the example)

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