How does C++ pass a CLSID?

[jj2007]

Question: Does the "REF" mean a pointer is passed, or are 16 bytes shuffled into the stack?

MS Learn:

Code Select Expand

HRESULT DllGetClassObject(
  [in]  REFCLSID rclsid,
  [in]  REFIID   riid,
  [out] LPVOID   *ppv

Parameters
[in] rclsid

The CLSID that will associate the correct data and code.

[in] riid

A reference to the identifier of the interface that the caller is to use to communicate with the class object. Usually, this is IID_IClassFactory (defined in the OLE headers as the interface identifier for IClassFactory).

[TimoVJL]

pointers they are.
guiddef.h

Code Select Expand

#ifndef _REFGUID_DEFINED
#define _REFGUID_DEFINED
#ifdef __cplusplus
#define REFGUID const GUID &
#else
#define REFGUID const GUID * __MIDL_CONST
#endif
#endif

#ifndef _REFIID_DEFINED
#define _REFIID_DEFINED
#ifdef __cplusplus
#define REFIID const IID &
#else
#define REFIID const IID * __MIDL_CONST
#endif
#endif

#ifndef _REFCLSID_DEFINED
#define _REFCLSID_DEFINED
#ifdef __cplusplus
#define REFCLSID const IID &
#else
#define REFCLSID const IID * __MIDL_CONST
#endif
#endif