; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +

#include <WinAPICom.au3>

; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +

$tagStruct = "ptr VTable; int RefCnt;" & _
        "handle hQueryInterface; handle hAddRef; handle hRelease;" & _
        "handle hMyFunc;" & _
        "ptr QueryInterface; ptr AddRef; ptr Release;" & _
        "ptr MyFunc;"

$tStruct = DllStructCreate($tagStruct)

With $tStruct
    .VTable = DllStructGetPtr($tStruct, "QueryInterface")
    .RefCnt = 1

    .hQueryInterface = DllCallbackRegister(QueryInterface, "long", "ptr; ptr; ptr;")
    .hAddRef = DllCallbackRegister(AddRef, "ulong", "ptr;")
    .hRelease = DllCallbackRegister(Release, "ulong", "ptr;")
    .hMyFunc = DllCallbackRegister(MyFunc, "none", "ptr;")

    .QueryInterface = DllCallbackGetPtr($tStruct.hQueryInterface)
    .AddRef = DllCallbackGetPtr($tStruct.hAddRef)
    .hRelease = DllCallbackGetPtr($tStruct.hRelease)
    .hMyFunc = DllCallbackGetPtr($tStruct.hMyFunc)
EndWith

; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +

$oObj = ObjCreateInterface(DllStructGetPtr($tStruct), _WinAPI_CreateGUID(), "MyFunc none();")

; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +

$oObj = Null
DllCallbackFree($tStruct.hRelease)

; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +

Func MyFunc($this)
EndFunc

; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +

Func QueryInterface($this, $riid, $ppvObject)
    $tObj = DllStructCreate("ptr p", $ppvObject)
    $tObj.p = $this
    AddRef($this)
EndFunc


Func AddRef($this)
    $tObj = DllStructCreate($tagStruct, $this)
    $tObj.RefCnt += 1
    Return $tObj.RefCnt
EndFunc


Func Release($this)
    $tObj = DllStructCreate($tagStruct, $this)
    $tObj.RefCnt -= 1

    If $tObj.RefCnt <= 0 Then
        DllCallbackFree($tObj.hQueryInterface)
        DllCallbackFree($tObj.hAddRef)
        DllCallbackFree($tObj.hMyFunc)
    EndIf

    Return $tObj.RefCnt
EndFunc

; ++++++++++ +++++++++ ++++++++ +++++++ ++++++ +++++ ++++ +++ ++ +