Package jnr.ffi.byref
Class ShortByReference
- All Implemented Interfaces:
Serializable
,ByReference<Short>
ShortByReference is used when the address of a primitive short value must be passed
as a parameter to a function.
For example, the following C code,
extern void get_a(short * ap);
short foo(void) {
short 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 ShortByReference ap);
}
and used like this
ShortByReference ap = new ShortByReference(); lib.get_a(ap); System.out.printf("a from lib=%d\n", a.getValue());
- See Also:
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Constructor Summary
ConstructorsConstructorDescriptionCreates a new reference to a short value initialized to zero.ShortByReference
(short value) Creates a new reference to a short value.ShortByReference
(Short value) Creates a new reference to a short value. -
Method Summary
Modifier and TypeMethodDescriptionvoid
fromNative
(Runtime runtime, Pointer buffer, long offset) Copies the short value from native memoryfinal int
nativeSize
(Runtime runtime) Gets the native size of type of reference in bytes.void
Copies the short value to native memoryMethods inherited from class jnr.ffi.byref.AbstractNumberReference
byteValue, checkNull, doubleValue, floatValue, getValue, intValue, longValue, shortValue
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Constructor Details
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ShortByReference
public ShortByReference()Creates a new reference to a short value initialized to zero. -
ShortByReference
Creates a new reference to a short value.- Parameters:
value
- the initial native value
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ShortByReference
public ShortByReference(short value) Creates a new reference to a short value.- Parameters:
value
- the initial native value
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Method Details
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toNative
Copies the short value to native memory- Parameters:
runtime
- the current runtime.buffer
- the native memory buffer.offset
- the memory offset.
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fromNative
Copies the short value from native memory- Parameters:
runtime
- the current runtime.buffer
- the native memory buffer.offset
- the memory offset.
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nativeSize
Gets the native size of type of reference in bytes.- Parameters:
runtime
- the current runtime.- Returns:
- the size of a byte in bytes
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