On Oct 10, 2007, at 7:15 AM, Jens Arm wrote:
Hi
First I want to thank you for JNA - It is very nice.
I have tested JNA with a self programmed .so on Linux and
it works great.
We aim to please. Or at least to keep it in the bowl.
Now I want to use it for a more complicated .so, but some
conversions I do not know:
Do I use in Java for "unsigned long" NativeLong, too?
Yes. It's the same size data, you just have to be careful with
values greater than 0x7FFFFFFF.
How do I convert enum's like this to java:
typedef enum
{
OK = 0,
FAILED = 1,
} ERRORCODE;
Must I use for enum, int?
enum is usually an int. you can always write a simple C program that
does sizeof(enum_type) to check.
This empty struct
struct _DATA;
typedef struct _DATA *HANDLE;
is it converted like this?
public class PEVQ_HANDLE extends Structure
{
}
It's not an empty struct, it's a forward declaration. Somewhere else
is a definition of struct _DATA. If you don't know what's in it,
just use a Pointer.
How do I convert the next two lines?
#define CALLBACK
ERRORCODE LibRun(HANDLE Handle, void (CALLBACK *pInfo)(char *Info));
void (CALLBACK *pInfo)(char *Info) is a callback, which needs to be
an interface that implements com.sun.jna.Callback, and declares a
single "callback" method. Assuming you define ERRORCODE and HANDLE
types, and that the callback is expecting a C string, the following
will work:
interface MyCallback extends Callback {
void callback(String info);
}
ERRORCODE LibRun(HANDLE h, MyCallback cb);
It wouldn't hurt to review the ANSI C manual (aka K&R) so that you
understand function declarations and macro preprocessing.
1 message in net.java.dev.jna.usersRe: [jna-users] Conversion to JNA
