jnr.ffi.byref

Class LongLongByReference

java.lang.Object

java.lang.Number

jnr.ffi.byref.AbstractNumberReference<Long>

jnr.ffi.byref.LongLongByReference

All Implemented Interfaces:

Serializable, ByReference<Long>

public final class LongLongByReference
extends AbstractNumberReference<Long>

LongLongByReference is used when the address of a native long long value must be passed as a parameter to a function.

For example, the following C code,

 
 extern void get_a(long long * ap);

 long long foo(void) {
     long long a;
     // pass a reference to 'a' so get_a() can fill it out
     get_a(&a);

     return a;
 }
 
 

Would be declared in java as

 
 interface Lib {
     void get_a(@Out LongLongByReference ap);
 }
 
 

and used like this

 LongLongByReference ap = new LongLongByReference();
 lib.get_a(ap);
 System.out.printf("a from lib=%d\n", a.longValue());
 

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
LongLongByReference() Creates a new reference to a long long value initialized to zero.
LongLongByReference(long value) Creates a new reference to a native longlong value
LongLongByReference(Long value) Creates a new reference to a native longlong value

Method Summary

Modifier and Type	Method and Description
void	fromNative(Runtime runtime, Pointer memory, long offset) Copies the value from native memory
int	nativeSize(Runtime runtime) Gets the native size of type of reference in bytes.
void	toNative(Runtime runtime, Pointer memory, long offset) Copies the value to native memory

Methods inherited from class jnr.ffi.byref.AbstractNumberReference

byteValue, checkNull, doubleValue, floatValue, getValue, intValue, longValue, shortValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LongLongByReference

public LongLongByReference()

Creates a new reference to a long long value initialized to zero.

LongLongByReference

public LongLongByReference(Long value)

Creates a new reference to a native longlong value

Parameters:

value - the initial native value

LongLongByReference

public LongLongByReference(long value)

Creates a new reference to a native longlong value

Parameters:

value - the initial native value

Method Detail

toNative

public void toNative(Runtime runtime,
                     Pointer memory,
                     long offset)

Copies the value to native memory

Parameters:

runtime - the current runtime.

memory - the native memory buffer.

offset - the memory offset.

fromNative

public void fromNative(Runtime runtime,
                       Pointer memory,
                       long offset)

Copies the value from native memory

Parameters:

runtime - the current runtime.

memory - the native memory buffer.

offset - the memory offset.

nativeSize

public final int nativeSize(Runtime runtime)

Gets the native size of type of reference in bytes.

Parameters:

runtime - the current runtime.

Returns:

the size of a byte in bytes