Package com.sun.jna

Class Structure.FFIType

java.lang.Object

com.sun.jna.Structure

com.sun.jna.Structure.FFIType

Enclosing class:

Structure

static class Structure.FFIType
extends Structure

This class auto-generates an ffi_type structure appropriate for a given structure for use by libffi. The lifecycle of this structure is easier to manage on the Java side than in native code.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Structure.FFIType.size_t

Nested classes/interfaces inherited from class com.sun.jna.Structure

Structure.ByReference, Structure.ByValue, Structure.FFIType, Structure.StructField, Structure.StructureSet

Field Summary

Fields

Modifier and Type	Field	Description
short	alignment
Pointer	elements
Structure.FFIType.size_t	size
short	type

Fields inherited from class com.sun.jna.Structure

ALIGN_DEFAULT, ALIGN_GNUC, ALIGN_MSVC, ALIGN_NONE, CALCULATE_SIZE, fieldOrder, layoutInfo

Method Summary

Modifier and Type	Method	Description
(package private) static Pointer	get(Object obj)	Obtain a pointer to the native FFI type descriptor for the given object.
protected List<String>	getFieldOrder()	Return this Structure's field names in their proper order.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from class com.sun.jna.Structure

allocateMemory, allocateMemory, autoAllocate, autoRead, autoRead, autoWrite, autoWrite, busy, cacheTypeInfo, calculateSize, calculateSize, clear, conditionalAutoRead, createFieldsOrder, createFieldsOrder, createFieldsOrder, createFieldsOrder, dataEquals, dataEquals, ensureAllocated, equals, fieldOffset, fields, getAutoRead, getAutoWrite, getFieldList, getFields, getFieldTypeInfo, getFieldValue, getNativeAlignment, getNativeSize, getNativeSize, getPointer, getStringEncoding, getStructAlignment, getTypeInfo, getTypeInfo, getTypeMapper, hashCode, newInstance, newInstance, read, readField, readField, reading, setAlignType, setAutoRead, setAutoSynch, setAutoWrite, setFieldOrder, setFieldValue, setStringEncoding, size, size, size, sortFields, toArray, toArray, toString, toString, typeInfoField, updateStructureByReference, useMemory, useMemory, useMemory, validate, write, writeField, writeField, writeField

Field Detail

size

public Structure.FFIType.size_t size

alignment

public short alignment

type

public short type

elements

public Pointer elements

Method Detail

getFieldOrder

protected List<String> getFieldOrder()

Description copied from class: Structure

Return this Structure's field names in their proper order. For example,

 protected List getFieldOrder() {
     return Arrays.asList(new String[] { ... });
 }
 

IMPORTANT When deriving from an existing Structure subclass, ensure that you augment the list provided by the superclass, e.g.

 protected List getFieldOrder() {
     List fields = new ArrayList(super.getFieldOrder());
     fields.addAll(Arrays.asList(new String[] { ... }));
     return fields;
 }
 

Field order must be explicitly indicated, since the field order as returned by Class.getFields() is not guaranteed to be predictable.

Overrides:

getFieldOrder in class Structure

Returns:

ordered list of field names

get

static Pointer get(Object obj)

Obtain a pointer to the native FFI type descriptor for the given object.