[wxWidgets.git] / include / wx / msw / ole / oleutils.h

///////////////////////////////////////////////////////////////////////////////
// Name:        oleutils.h
// Purpose:     OLE helper routines, OLE debugging support &c
// Author:      Vadim Zeitlin
// Modified by:
// Created:     19.02.1998
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

#ifndef   _WX_OLEUTILS_H
#define   _WX_OLEUTILS_H

#ifdef __GNUG__
#pragma interface "oleutils.h"
#endif

#include "wx/defs.h"

// ============================================================================
// General purpose functions and macros
// ============================================================================

// ----------------------------------------------------------------------------
// misc helper functions/macros
// ----------------------------------------------------------------------------

// release the interface pointer (if !NULL)
inline void ReleaseInterface(IUnknown *pIUnk)
{
  if ( pIUnk != NULL )
    pIUnk->Release();
}

// release the interface pointer (if !NULL) and make it NULL
#define   RELEASE_AND_NULL(p)   if ( (p) != NULL ) { p->Release(); p = NULL; };

// return TRUE if the iid is in the array
bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);

// ============================================================================
// IUnknown implementation helpers
// ============================================================================

/*
   The most dumb implementation of IUnknown methods. We don't support
   aggregation nor containment, but for 99% of cases this simple
   implementation is quite enough.

   Usage is trivial: here is all you should have
   1) DECLARE_IUNKNOWN_METHOS in your (IUnknown derived!) class declaration
   2) BEGIN/END_IID_TABLE with ADD_IID in between for all interfaces you
      support (at least all for which you intent to return 'this' from QI,
      i.e. you should derive from IFoo if you have ADD_IID(Foo)) somewhere else
   3) IMPLEMENT_IUNKNOWN_METHOS somewhere also

   These macros are quite simple: AddRef and Release are trivial and QI does
   lookup in a static member array of IIDs and returns 'this' if it founds
   the requested interface in it or E_NOINTERFACE if not.
 */

// declare the methods and the member variable containing reference count
// you must also define the ms_aIids array somewhere with BEGIN_IID_TABLE
// and friends (see below)
#define   DECLARE_IUNKNOWN_METHODS                                            \
  public:                                                                     \
    STDMETHODIMP          QueryInterface(REFIID, void **);                    \
    STDMETHODIMP_(ULONG)  AddRef();                                           \
    STDMETHODIMP_(ULONG)  Release();                                          \
  private:                                                                    \
    static  const IID    *ms_aIids[];                                         \
    ULONG                 m_cRef

// macros for declaring supported interfaces
// NB: you should write ADD_INTERFACE(Foo) and not ADD_INTERFACE(IID_IFoo)!
#define BEGIN_IID_TABLE(cname)  const IID *cname::ms_aIids[] = {
#define ADD_IID(iid)                                             &IID_I##iid,
#define END_IID_TABLE                                          }

// implementation is as straightforward as possible
// Parameter:  classname - the name of the class
#define   IMPLEMENT_IUNKNOWN_METHODS(classname)                               \
  STDMETHODIMP classname::QueryInterface(REFIID riid, void **ppv)             \
  {                                                                           \
    wxLogQueryInterface(#classname, riid);                                    \
                                                                              \
    if ( IsIidFromList(riid, ms_aIids, WXSIZEOF(ms_aIids)) ) {                  \
      *ppv = this;                                                            \
      AddRef();                                                               \
                                                                              \
      return S_OK;                                                            \
    }                                                                         \
    else {                                                                    \
      *ppv = NULL;                                                            \
                                                                              \
      return (HRESULT) E_NOINTERFACE;                                                   \
    }                                                                         \
  }                                                                           \
                                                                              \
  STDMETHODIMP_(ULONG) classname::AddRef()                                    \
  {                                                                           \
    wxLogAddRef(#classname, m_cRef);                                          \
                                                                              \
    return ++m_cRef;                                                          \
  }                                                                           \
                                                                              \
  STDMETHODIMP_(ULONG) classname::Release()                                   \
  {                                                                           \
    wxLogRelease(#classname, m_cRef);                                         \
                                                                              \
    if ( --m_cRef == 0 ) {                                                    \
      delete this;                                                            \
      return 0;                                                               \
    }                                                                         \
    else                                                                      \
      return m_cRef;                                                          \
  }

// ============================================================================
// Debugging support
// ============================================================================

// VZ: I don't know it's not done for compilers other than VC++ but I leave it
//     as is. Please note, though, that tracing OLE interface calls may be
//     incredibly useful when debugging OLE programs.
#if defined(__WXDEBUG__) && defined(__VISUALC__) && (__VISUALC__ >= 1000)
// ----------------------------------------------------------------------------
// All OLE specific log functions have DebugTrace level (as LogTrace)
// ----------------------------------------------------------------------------

// tries to translate riid into a symbolic name, if possible
void wxLogQueryInterface(const char *szInterface, REFIID riid);

// these functions print out the new value of reference counter
void wxLogAddRef (const char *szInterface, ULONG cRef);
void wxLogRelease(const char *szInterface, ULONG cRef);

#else   //!WXDEBUG
  #define   wxLogQueryInterface(szInterface, riid)
  #define   wxLogAddRef(szInterface, cRef)
  #define   wxLogRelease(szInterface, cRef)
#endif  //WXDEBUG

#endif  //_WX_OLEUTILS_H
Commit	Line	Data
bbf1f0e5 KB	1	///////////////////////////////////////////////////////////////////////////////
	2	// Name: oleutils.h
	3	// Purpose: OLE helper routines, OLE debugging support &c
	4	// Author: Vadim Zeitlin
3f4a0c5b	5	// Modified by:
bbf1f0e5 KB	6	// Created: 19.02.1998
	7	// RCS-ID: $Id$
	8	// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
bbcdf8bc	9	// Licence: wxWindows licence
bbf1f0e5 KB	10	///////////////////////////////////////////////////////////////////////////////
bbf1f0e5 KB	11
bbcdf8bc JS	12	#ifndef _WX_OLEUTILS_H
bbcdf8bc JS	13	#define _WX_OLEUTILS_H
bbf1f0e5 KB	14
	15	#ifdef __GNUG__
	16	#pragma interface "oleutils.h"
	17	#endif
	18
e5ad6961 JS	19	#include "wx/defs.h"
e5ad6961 JS	20
bbf1f0e5 KB	21	// ============================================================================
	22	// General purpose functions and macros
	23	// ============================================================================
	24
	25	// ----------------------------------------------------------------------------
	26	// misc helper functions/macros
	27	// ----------------------------------------------------------------------------
	28
	29	// release the interface pointer (if !NULL)
	30	inline void ReleaseInterface(IUnknown *pIUnk)
	31	{
	32	if ( pIUnk != NULL )
	33	pIUnk->Release();
	34	}
	35
	36	// release the interface pointer (if !NULL) and make it NULL
	37	#define RELEASE_AND_NULL(p) if ( (p) != NULL ) { p->Release(); p = NULL; };
	38
	39	// return TRUE if the iid is in the array
	40	bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);
	41
	42	// ============================================================================
	43	// IUnknown implementation helpers
	44	// ============================================================================
	45
	46	/*
3f4a0c5b	47	The most dumb implementation of IUnknown methods. We don't support
bbf1f0e5 KB	48	aggregation nor containment, but for 99% of cases this simple
	49	implementation is quite enough.
	50
	51	Usage is trivial: here is all you should have
	52	1) DECLARE_IUNKNOWN_METHOS in your (IUnknown derived!) class declaration
	53	2) BEGIN/END_IID_TABLE with ADD_IID in between for all interfaces you
	54	support (at least all for which you intent to return 'this' from QI,
	55	i.e. you should derive from IFoo if you have ADD_IID(Foo)) somewhere else
	56	3) IMPLEMENT_IUNKNOWN_METHOS somewhere also
	57
	58	These macros are quite simple: AddRef and Release are trivial and QI does
	59	lookup in a static member array of IIDs and returns 'this' if it founds
	60	the requested interface in it or E_NOINTERFACE if not.
	61	*/
	62
	63	// declare the methods and the member variable containing reference count
	64	// you must also define the ms_aIids array somewhere with BEGIN_IID_TABLE
	65	// and friends (see below)
	66	#define DECLARE_IUNKNOWN_METHODS \
	67	public: \
	68	STDMETHODIMP QueryInterface(REFIID, void **); \
	69	STDMETHODIMP_(ULONG) AddRef(); \
	70	STDMETHODIMP_(ULONG) Release(); \
	71	private: \
	72	static const IID *ms_aIids[]; \
	73	ULONG m_cRef
	74
	75	// macros for declaring supported interfaces
	76	// NB: you should write ADD_INTERFACE(Foo) and not ADD_INTERFACE(IID_IFoo)!
	77	#define BEGIN_IID_TABLE(cname) const IID *cname::ms_aIids[] = {
	78	#define ADD_IID(iid) &IID_I##iid,
	79	#define END_IID_TABLE }
	80
	81	// implementation is as straightforward as possible
	82	// Parameter: classname - the name of the class
	83	#define IMPLEMENT_IUNKNOWN_METHODS(classname) \
	84	STDMETHODIMP classname::QueryInterface(REFIID riid, void **ppv) \
	85	{ \
	86	wxLogQueryInterface(#classname, riid); \
	87	\
	88	if ( IsIidFromList(riid, ms_aIids, WXSIZEOF(ms_aIids)) ) { \
	89	*ppv = this; \
	90	AddRef(); \
	91	\
	92	return S_OK; \
	93	} \
	94	else { \
	95	*ppv = NULL; \
	96	\
	97	return (HRESULT) E_NOINTERFACE; \
	98	} \
	99	} \
	100	\
	101	STDMETHODIMP_(ULONG) classname::AddRef() \
	102	{ \
	103	wxLogAddRef(#classname, m_cRef); \
	104	\
	105	return ++m_cRef; \
	106	} \
	107	\
	108	STDMETHODIMP_(ULONG) classname::Release() \
	109	{ \
	110	wxLogRelease(#classname, m_cRef); \
	111	\
112	if ( --m_cRef == 0 ) { \
113	delete this; \
114	return 0; \
115	} \
116	else \
117	return m_cRef; \
118	}
119
120	// ============================================================================
121	// Debugging support
122	// ============================================================================
123
3f4a0c5b VZ	124	// VZ: I don't know it's not done for compilers other than VC++ but I leave it
	125	// as is. Please note, though, that tracing OLE interface calls may be
	126	// incredibly useful when debugging OLE programs.
	127	#if defined(__WXDEBUG__) && defined(__VISUALC__) && (__VISUALC__ >= 1000)
bbf1f0e5 KB	128	// ----------------------------------------------------------------------------
	129	// All OLE specific log functions have DebugTrace level (as LogTrace)
	130	// ----------------------------------------------------------------------------
	131
	132	// tries to translate riid into a symbolic name, if possible
	133	void wxLogQueryInterface(const char *szInterface, REFIID riid);
	134
	135	// these functions print out the new value of reference counter
	136	void wxLogAddRef (const char *szInterface, ULONG cRef);
	137	void wxLogRelease(const char *szInterface, ULONG cRef);
	138
b2aef89b	139	#else //!WXDEBUG
bbf1f0e5 KB	140	#define wxLogQueryInterface(szInterface, riid)
	141	#define wxLogAddRef(szInterface, cRef)
	142	#define wxLogRelease(szInterface, cRef)
b2aef89b	143	#endif //WXDEBUG
bbf1f0e5	144
3f4a0c5b VZ	145	#endif //_WX_OLEUTILS_H
3f4a0c5b VZ	146