6 messages in net.java.dev.jna.usersRe: [jna-users] UnsupportedOperationE...
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Stas OskinMay 26, 2009 4:28 am 
Timothy WallMay 26, 2009 4:42 am 
Stas OskinMay 26, 2009 5:02 am 
Timothy WallMay 26, 2009 5:17 am 
Stas OskinMay 26, 2009 5:28 am 
Stas OskinMay 27, 2009 4:18 am 
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Subject:Re: [jna-users] UnsupportedOperationException when trying to get byte array fom ByteBufferActions...
From:Timothy Wall (twal@dev.java.net)
Date:May 26, 2009 4:42:52 am
List:net.java.dev.jna.users

Apparently the ByteBuffer produced by JNI's NewDirectByteBuffer does not support an array view.

I wouldn't expect this function to be valid, since it's supposed to return the array that backs the buffer. In the case of a direct buffer, there is no backing array.

According to the javadoc, invoke "hasArray" before invoking "array" to ensure the buffer has an accessible backing array
(http://java.sun.com/j2se/1.5.0/docs/api/java/nio/ByteBuffer.html#array() ).

On May 26, 2009, at 7:28 AM, Stas Oskin wrote:

Hi.

I'm trying to directly access memory located in pointer, but for some reason I can only do it if I copy the memory via getByteArray().

Running the code below:

buf -> Pointer; final byte[] ba = buf.getByteBuffer(0, size).array();

Produces: Caused by: java.lang.UnsupportedOperationException

at java.nio.ByteBuffer.array(ByteBuffer.java:940)

Can someone advice how this can be solved?

Thanks in advance.

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