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

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

void	marshal(Pointer memory, long offset) Copies the value to native memory
int	nativeSize(Runtime runtime) Gets the native size of type of reference in bytes.
void	unmarshal(Pointer memory, long offset) Copies the value from 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

marshal

public void marshal(Pointer memory,
                    long offset)

Copies the value to native memory

Parameters:

memory - the native memory buffer

unmarshal

public void unmarshal(Pointer memory,
                      long offset)

Copies the value from native memory

Parameters:

memory - the native memory buffer.

nativeSize

public final int nativeSize(Runtime runtime)

Gets the native size of type of reference in bytes.

Returns:

the size of a byte in bytes