Package jnr.ffi.byref

Class 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:
  • Constructor Details

    • 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 Details

    • 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