随机访问文件＆GT; 2GB与Android SDK [英] Random Access files > 2GB with Android SDK

问题描述

谁能告诉我如何随机访问超过2GB的文件与Android SDK。
我试图寻求一个位置> 2147483647，得到了异常：值太大定义的数据类型。这是奇数作为寻求命令的参数的类型是长。详情请参阅code例如：

can anyone tell me how to random access a file beyond 2GB with android SDK. I was trying to seek to a position > 2147483647 and got the exception: "Value too large for defined datatype". That is odd as the parameter for the seek command is type "long". See the code example for details:

RandomAccessFile    BigFile;
BigFile = new RandomAccessFile(sMyFileName, "r");
BigFile.seek(2147483648);
   --> Exception

感谢您的帮助，
迈克尔

Thanks for any help, Michael

推荐答案

这是个例外，从本地/ IO（系统）层冒泡的结果。它不具有与在语言/ VM自身的类型的大小有关。在低杠杆的错误是EOVERFLOW（价值大的定义的数据类型）。 lseek的，例如，列出了这个错误。

That is the result of the exception bubbling up from the native/IO (system) layer. It doesn't have to do with the size of the type in the language/VM itself. The error at the lower lever is EOVERFLOW ("Value to large for defined data type"). lseek, for instance, lists this error.

假设：底层系统的访问是不是64位的感知:-)部分的真正的JRE中也有这个问题在历史上，IIRC。不知道在Android上的故事是什么。

Hypothesis: The underlying system access isn't 64-bit "aware" :-) Some real JREs also had this problem historically, IIRC. Not sure what the story on android is.

编辑：是在 FAT32文件大小为2GB线程有限似乎涉及了Android 2.x的（并包含有关内核构建和/或IO LIB限制的详细信息/提示/假设 - 的共识是它不工作）。

The thread at FAT32 file size limited to 2GB seems to relate the Android 2.x (and contains details/hints/hypothesis about the kernel build and/or IO lib limitations -- consensus is "it doesn't work").

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