Examples of com.sun.jna.Structure

com.sun.jna.Structure
Represents a native structure with a Java peer class. When used as a function parameter or return value, this class corresponds to struct*. When used as a field within another Structure, it corresponds to struct. The tagging interfaces {@link ByReference} and {@link ByValue} may be usedto alter the default behavior. Structures may have variable size, but only by providing an array field (e.g. byte[]).
See the overview for supported type mappings for struct fields.
Structure alignment and type mappings are derived by default from the enclosing interface definition (if any) by using {@link Native#getStructureAlignment} and {@link Native#getTypeMapper}. Alternatively you can explicitly provide alignment, field order, or type mapping by calling the respective Structure functions in your subclass's constructor.
Structure fields corresponding to native struct fields must be public. If your structure is to have no fields of its own, it must be declared abstract.
You must define {@link #getFieldOrder} to return a List offield names (Strings) indicating the proper order of the fields. When dealing with multiple levels of subclasses of Structure, you must add to the list provided by the superclass {@link #getFieldOrder}the fields defined in the current class.
In the past, most VMs would return them in a predictable order, but the JVM spec does not require it, so {@link #getFieldOrder} is now required toensure JNA knows the proper order).
Structure fields may additionally have the following modifiers:
- volatile JNA will not write the field unless specifically instructed to do so via {@link #writeField(String)}. This allows you to prevent inadvertently overwriting memory that may be updated in real time on another (possibly native) thread.
- final JNA will overwrite the field via {@link #read()}, but otherwise the field is not modifiable from Java. Take care when using this option, since the compiler will usually assume all accesses to the field (for a given Structure instance) have the same value. This modifier is invalid to use on J2ME.
NOTE: Strings are used to represent native C strings because usage of char * is generally more common than wchar_t *. You may provide a type mapper ( {@link com.sun.jna.win32.W32APITypeMapper example here)} if you prefer to use String in place of {@link WString} ifyour native code predominantly uses wchar_t *.
NOTE: In general, instances of this class are not synchronized.
@author Todd Fast, todd.fast@sun.com @author twall@users.sf.net

            if(ppc) {
                // on ppc32 structs never return in registers
                return objc_msgSend_stret_Pair;
            }
            // on i386 structs with sizeof exactly equal to 1, 2, 4, or 8 return in registers
            Structure prototype = (Structure) returnTypeForThisCall.newInstance();
            return prototype.size() < stretCutoff ? objc_msgSend_Pair : objc_msgSend_stret_Pair;
        }
        catch(InstantiationException e) {
            throw new RococoaException(e);
        }
        catch(IllegalAccessException e) {

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    }
    
    private Structure readStructureByValue(NSInvocation invocation, int index, 
            Class<? extends Structure> type)
    {
        Structure result = newInstance(type);
        Memory buffer = new Memory(result.size());
        invocation.getArgument_atIndex(buffer, index);
        return copyBufferToStructure(buffer, result);
    }

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            Class<? extends Structure> type)
    {
        Memory buffer = new Memory(Native.POINTER_SIZE);
        invocation.getArgument_atIndex(buffer, index);
        Pointer pointerToResult = buffer.getPointer(0);
        Structure result = newInstance(type);        
        return copyBufferToStructure(pointerToResult, result);
    }

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    public static void main(String[] args) {
        junit.textui.TestRunner.run(Shell32Test.class);
    }


    public void testStructurePacking() {
        Structure s = new ShellAPI.SHFILEOPSTRUCT();
        final int SIZE = Pointer.SIZE * 5 + 10; // 5 pointers, 2 ints, 1 short
        assertEquals("Wrong structure size", SIZE, s.size());
    }

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            if(ppc) {
                // on ppc32 structs never return in registers
                return objc_msgSend_stret_Pair;
            }
            // on i386 structs with sizeof exactly equal to 1, 2, 4, or 8 return in registers
            Structure prototype = (Structure) returnTypeForThisCall.newInstance();
            return prototype.size() < stretCutoff ? objc_msgSend_Pair : objc_msgSend_stret_Pair;
        }
        catch(InstantiationException e) {
            throw new RococoaException(e);
        }
        catch(IllegalAccessException e) {

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    }
    
    private Structure readStructureByValue(NSInvocation invocation, int index, 
            Class<? extends Structure> type)
    {
        Structure result = newInstance(type);
        Memory buffer = new Memory(result.size());
        invocation.getArgument_atIndex(buffer, index);
        return copyBufferToStructure(buffer, result);
    }

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            Class<? extends Structure> type)
    {
        Memory buffer = new Memory(Native.POINTER_SIZE);
        invocation.getArgument_atIndex(buffer, index);
        Pointer pointerToResult = buffer.getPointer(0);
        Structure result = newInstance(type);        
        return copyBufferToStructure(pointerToResult, result);
    }

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import com.sun.jna.Structure;
import junit.framework.TestCase;


public class Shell32Test extends TestCase {
    public void testStructurePacking() {
        Structure s = new Shell32.SHFILEOPSTRUCT();
        assertEquals("Wrong structure size", 30, s.size());
    }

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            case kEdsDataType_Point: //EdsPoint
            case kEdsDataType_Rect: //EdsRect
            case kEdsDataType_Time: //EdsTime
            case kEdsDataType_FocusInfo: //EdsFocusInfo
            case kEdsDataType_PictureStyleDesc: { //EdsPictureStyleDesc
                final Structure structure = (Structure) value;
                structure.write();
                pointer = structure.getPointer();
                size = structure.size();
                break;
            }
            case kEdsDataType_Int8_Array: //EdsInt8[]
            case kEdsDataType_UInt8_Array: { //EdsUInt8[]
                final byte[] array = (byte[]) value;

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    public static void main(String[] args) {
        junit.textui.TestRunner.run(Shell32Test.class);
    }


    public void testStructurePacking() {
        Structure s = new Shell32.SHFILEOPSTRUCT();
        final int SIZE = Pointer.SIZE * 5 + 10; // 5 pointers, 2 ints, 1 short
        assertEquals("Wrong structure size", SIZE, s.size());
    }

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