3f4a0c5be3
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1580 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
147 lines
7.4 KiB
C
147 lines
7.4 KiB
C
///////////////////////////////////////////////////////////////////////////////
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// Name: oleutils.h
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// Purpose: OLE helper routines, OLE debugging support &c
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 19.02.1998
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// RCS-ID: $Id$
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_OLEUTILS_H
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#define _WX_OLEUTILS_H
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#ifdef __GNUG__
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#pragma interface "oleutils.h"
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#endif
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#include "wx/defs.h"
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// ============================================================================
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// General purpose functions and macros
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// ============================================================================
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// ----------------------------------------------------------------------------
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// misc helper functions/macros
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// ----------------------------------------------------------------------------
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// release the interface pointer (if !NULL)
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inline void ReleaseInterface(IUnknown *pIUnk)
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{
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if ( pIUnk != NULL )
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pIUnk->Release();
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}
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// release the interface pointer (if !NULL) and make it NULL
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#define RELEASE_AND_NULL(p) if ( (p) != NULL ) { p->Release(); p = NULL; };
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// return TRUE if the iid is in the array
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bool IsIidFromList(REFIID riid, const IID *aIids[], size_t nCount);
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// ============================================================================
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// IUnknown implementation helpers
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// ============================================================================
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/*
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The most dumb implementation of IUnknown methods. We don't support
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aggregation nor containment, but for 99% of cases this simple
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implementation is quite enough.
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Usage is trivial: here is all you should have
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1) DECLARE_IUNKNOWN_METHOS in your (IUnknown derived!) class declaration
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2) BEGIN/END_IID_TABLE with ADD_IID in between for all interfaces you
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support (at least all for which you intent to return 'this' from QI,
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i.e. you should derive from IFoo if you have ADD_IID(Foo)) somewhere else
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3) IMPLEMENT_IUNKNOWN_METHOS somewhere also
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These macros are quite simple: AddRef and Release are trivial and QI does
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lookup in a static member array of IIDs and returns 'this' if it founds
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the requested interface in it or E_NOINTERFACE if not.
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*/
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// declare the methods and the member variable containing reference count
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// you must also define the ms_aIids array somewhere with BEGIN_IID_TABLE
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// and friends (see below)
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#define DECLARE_IUNKNOWN_METHODS \
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public: \
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STDMETHODIMP QueryInterface(REFIID, void **); \
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STDMETHODIMP_(ULONG) AddRef(); \
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STDMETHODIMP_(ULONG) Release(); \
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private: \
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static const IID *ms_aIids[]; \
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ULONG m_cRef
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// macros for declaring supported interfaces
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// NB: you should write ADD_INTERFACE(Foo) and not ADD_INTERFACE(IID_IFoo)!
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#define BEGIN_IID_TABLE(cname) const IID *cname::ms_aIids[] = {
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#define ADD_IID(iid) &IID_I##iid,
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#define END_IID_TABLE }
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// implementation is as straightforward as possible
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// Parameter: classname - the name of the class
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#define IMPLEMENT_IUNKNOWN_METHODS(classname) \
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STDMETHODIMP classname::QueryInterface(REFIID riid, void **ppv) \
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{ \
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wxLogQueryInterface(#classname, riid); \
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\
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if ( IsIidFromList(riid, ms_aIids, WXSIZEOF(ms_aIids)) ) { \
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*ppv = this; \
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AddRef(); \
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\
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return S_OK; \
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} \
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else { \
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*ppv = NULL; \
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\
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return (HRESULT) E_NOINTERFACE; \
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} \
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} \
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\
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STDMETHODIMP_(ULONG) classname::AddRef() \
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{ \
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wxLogAddRef(#classname, m_cRef); \
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\
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return ++m_cRef; \
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} \
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\
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STDMETHODIMP_(ULONG) classname::Release() \
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{ \
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wxLogRelease(#classname, m_cRef); \
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\
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if ( --m_cRef == 0 ) { \
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delete this; \
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return 0; \
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} \
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else \
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return m_cRef; \
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}
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// ============================================================================
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// Debugging support
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// ============================================================================
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// VZ: I don't know it's not done for compilers other than VC++ but I leave it
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// as is. Please note, though, that tracing OLE interface calls may be
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// incredibly useful when debugging OLE programs.
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#if defined(__WXDEBUG__) && defined(__VISUALC__) && (__VISUALC__ >= 1000)
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// ----------------------------------------------------------------------------
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// All OLE specific log functions have DebugTrace level (as LogTrace)
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// ----------------------------------------------------------------------------
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// tries to translate riid into a symbolic name, if possible
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void wxLogQueryInterface(const char *szInterface, REFIID riid);
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// these functions print out the new value of reference counter
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void wxLogAddRef (const char *szInterface, ULONG cRef);
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void wxLogRelease(const char *szInterface, ULONG cRef);
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#else //!WXDEBUG
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#define wxLogQueryInterface(szInterface, riid)
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#define wxLogAddRef(szInterface, cRef)
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#define wxLogRelease(szInterface, cRef)
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#endif //WXDEBUG
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#endif //_WX_OLEUTILS_H
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