Comments (4)
On Feb 6, 2012, at 6:29 AM, Alexey Kuznetsov wrote:
Hello
I'm using jna to get some mac native data from system core functions.
I found JNA unable to retrive UniChar buffers encoded as 16 bit unicode string.
Real memory block i read from function is
[97, 0, 98, 0, 99, 0] == ["abc"]
is this an array of java "short"? if not, you've not got enough data.
but string decoded by Memory.getString(0,true) = "ac"
I'm assuing it does 32 bit unicode char length.
I believe wchar_t is 32 bits on most unix-like systems. if your native code is using 16-bit encoding (Java uses modified UTF-16), then you'll need to decode the data buffer yourself, or set jna.encoding to an appropriate value and use Native.toString(byte[]) and let Java do the decoding.
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this is not an array. this is Memory object.
i'm not using "my native code", i'm using jna + mac osx lion librarys (frameworks).
and i can encode java String to CFStringRef using JNA. But i unable to decode it back. I think that is a JNA bug.
from jna.
You might want to check out rococoa, which specifically addresses the specifics of OSX, ObjC, and CFStringRef mappings.
from jna.
wchar_t is 4 bytes on OSX, so Native.toString(byte[] data, true) (extract wide string from memory) will not work if your memory is stored in 16-bit chunks.
Instead, you'll need to read the 16 bit values and store them in a java char[], from which you can create a String.
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