如何将字节数组数据导入DoubleBuffer [英] How to get a byte array data into DoubleBuffer

问题描述

我想从字节数组中提取一组坐标到DoubleBuffer。

I would like to extract a set of coordinates from a byte array into a DoubleBuffer.

下面是我如何从main中提取一组坐标的示例字节数组到另一个字节数组。

Below is an example of how I extract a set of coordinates from the main byte array into another byte array.

byte intPoints[] = new byte[4];
byte geomCoords[];
...
is = new ByteArrayInputStream(stmt.column_bytes(0)); //reads the polygon from db
...
is.read(intPoints); //intPoints now holds the number of points in the polygon
//After this is read the actual coordinate list is next

//Set the size of geomCoords to hold all coordinates,
//There are 2 coordinates per point and each coordinate is a double value(8 bytes)
geomCoords = new byte[ByteBuffer.wrap(intPoints).order(endian).getInt() * 2 * 8];

is.read(geomCoords); //geomCoords now holds all the coordinates for the polygon

我的问题是：

如何将geomCoords字节数组转换为DoubleBuffer？
$
或

我可以在不创建geomCoords的情况下将此数据导入DoubleBuffer吗？速度和效率是关键，所以任何捷径或优化都是最受欢迎的！

My questions are:
How can I get geomCoords byte array into a DoubleBuffer?
Or
Can I get this data into a DoubleBuffer without the creation of geomCoords? Speed and efficiency is key, so any shortcut or optimization is most welcome!

推荐答案

如果你知道字节中的8个字节缓冲区确实是双打，然后只需

If you know that the 8 bytes in the bytes buffer are indeed Doubles, then simply

DoubleBuffer dbls = new ByteBuffer(geomCoords).asDoubleBuffer();

现在可以用 dbls.get（）;

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