Class ComObjectFFM

java.lang.Object

oshi.ffm.ForeignFunctions

oshi.ffm.windows.com.IUnknownFFM

oshi.ffm.windows.com.ComObjectFFM

Direct Known Subclasses:

IEnumWbemClassObjectFFM, IWbemClassObjectFFM, IWbemLocatorFFM, IWbemServicesFFM

public class ComObjectFFM
extends IUnknownFFM

Base class for COM object operations via FFM.

Provides utilities for vtable access. IUnknown interface methods (AddRef, Release, safeRelease) are in IUnknownFFM.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final long	PTR_SIZE	Size of a pointer in bytes (8 on 64-bit systems).

Fields inherited from class ForeignFunctions

CAPTURE_CALL_STATE, CAPTURED_STATE_LAYOUT, ERRNO_HANDLE, LIBRARY_ARENA, LINKER, NATIVE_LONG_SIZE, NATIVE_POINTER_SIZE, NATIVE_SIZE_T_SIZE, SYMBOL_LOOKUP

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ComObjectFFM()

Method Summary

Modifier and Type	Method	Description
protected static MethodHandle	createDowncall(MemorySegment fnPtr, FunctionDescriptor descriptor)	Creates a downcall handle for a vtable function.
protected static MemorySegment	getVtable(MemorySegment pObject, Arena arena)	Gets the vtable pointer from a COM object.
protected static MemorySegment	getVtableFunction(MemorySegment vtable, int index)	Gets a function pointer from a vtable at the specified index.

Methods inherited from class IUnknownFFM

addRef, release, safeRelease

Methods inherited from class ForeignFunctions

downcall, getByteArrayFromNativePointer, getErrno, getStringFromNativePointer, getStructFromNativePointer, lib, libraryLookup

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

PTR_SIZE

protected static final long PTR_SIZE

Size of a pointer in bytes (8 on 64-bit systems).

Constructor Details

ComObjectFFM

protected ComObjectFFM()

Method Details

getVtable

protected static MemorySegment getVtable(MemorySegment pObject,
 Arena arena)

Gets the vtable pointer from a COM object.

Parameters:

pObject - the COM object pointer

arena - the arena for memory reinterpretation

Returns:

the vtable memory segment

getVtableFunction

protected static MemorySegment getVtableFunction(MemorySegment vtable,
 int index)

Gets a function pointer from a vtable at the specified index.

Parameters:

vtable - the vtable memory segment

index - the function index (0-based)

Returns:

the function pointer

createDowncall

protected static MethodHandle createDowncall(MemorySegment fnPtr,
 FunctionDescriptor descriptor)

Creates a downcall handle for a vtable function.

Parameters:

fnPtr - the function pointer

descriptor - the function descriptor

Returns:

the method handle