a17ce3debe
Apparently combaseapi.h header file is not present in the older development environments.
164 lines
7.9 KiB
C++
164 lines
7.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/ole/comimpl.h
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// Purpose: COM helper routines, COM 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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// 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_COMIMPL_H
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#define WX_COMIMPL_H
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#include "wx/defs.h"
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#include "wx/msw/wrapwin.h"
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// get IUnknown, REFIID &c
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#include <objbase.h>
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// ============================================================================
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// General purpose functions and 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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extern WXDLLIMPEXP_CORE 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_METHODS 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_METHODS 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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/*
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wxAutoULong: this class is used for automatically initalising m_cRef to 0
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*/
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class wxAutoULong
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{
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public:
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wxAutoULong(ULONG value = 0) : m_Value(value) { }
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operator ULONG&() { return m_Value; }
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ULONG& operator=(ULONG value) { m_Value = value; return m_Value; }
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wxAutoULong& operator++() { ++m_Value; return *this; }
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const wxAutoULong operator++( int ) { wxAutoULong temp = *this; ++m_Value; return temp; }
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wxAutoULong& operator--() { --m_Value; return *this; }
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const wxAutoULong operator--( int ) { wxAutoULong temp = *this; --m_Value; return temp; }
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private:
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ULONG m_Value;
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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 **) wxOVERRIDE; \
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STDMETHODIMP_(ULONG) AddRef() wxOVERRIDE; \
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STDMETHODIMP_(ULONG) Release() wxOVERRIDE; \
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private: \
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static const IID *ms_aIids[]; \
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wxAutoULong m_cRef
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// macros for declaring supported interfaces
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// NB: ADD_IID prepends IID_I whereas ADD_RAW_IID does not
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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 ADD_RAW_IID(iid) &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(wxT(#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(wxT(#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(wxT(#classname), m_cRef); \
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\
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if ( --m_cRef == wxAutoULong(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 COM interface calls may be
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// incredibly useful when debugging COM programs.
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#if defined(__WXDEBUG__) && defined(__VISUALC__)
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// ----------------------------------------------------------------------------
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// All COM 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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WXDLLIMPEXP_CORE void wxLogQueryInterface(const wxChar *szInterface, REFIID riid);
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// these functions print out the new value of reference counter
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WXDLLIMPEXP_CORE void wxLogAddRef (const wxChar *szInterface, ULONG cRef);
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WXDLLIMPEXP_CORE void wxLogRelease(const wxChar *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_COMIMPL_H
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