1 // MyCom.h
2
3 #ifndef __MY_COM_H
4 #define __MY_COM_H
5
6 #include "MyWindows.h"
7 #include "MyTypes.h"
8
9 #ifndef RINOK
10 #define RINOK(x) { HRESULT __result_ = (x); if (__result_ != S_OK) return __result_; }
11 #endif
12
13 template <class T>
14 class CMyComPtr
15 {
16 T* _p;
17 public:
CMyComPtr()18 CMyComPtr(): _p(NULL) {}
throw()19 CMyComPtr(T* p) throw() { if ((_p = p) != NULL) p->AddRef(); }
throw()20 CMyComPtr(const CMyComPtr<T>& lp) throw() { if ((_p = lp._p) != NULL) _p->AddRef(); }
~CMyComPtr()21 ~CMyComPtr() { if (_p) _p->Release(); }
Release()22 void Release() { if (_p) { _p->Release(); _p = NULL; } }
23 operator T*() const { return (T*)_p; }
24 // T& operator*() const { return *_p; }
25 T** operator&() { return &_p; }
26 T* operator->() const { return _p; }
27 T* operator=(T* p)
28 {
29 if (p)
30 p->AddRef();
31 if (_p)
32 _p->Release();
33 _p = p;
34 return p;
35 }
36 T* operator=(const CMyComPtr<T>& lp) { return (*this = lp._p); }
37 bool operator!() const { return (_p == NULL); }
38 // bool operator==(T* pT) const { return _p == pT; }
Attach(T * p2)39 void Attach(T* p2)
40 {
41 Release();
42 _p = p2;
43 }
Detach()44 T* Detach()
45 {
46 T* pt = _p;
47 _p = NULL;
48 return pt;
49 }
50 #ifdef _WIN32
51 HRESULT CoCreateInstance(REFCLSID rclsid, REFIID iid, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
52 {
53 return ::CoCreateInstance(rclsid, pUnkOuter, dwClsContext, iid, (void**)&_p);
54 }
55 #endif
56 /*
57 HRESULT CoCreateInstance(LPCOLESTR szProgID, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
58 {
59 CLSID clsid;
60 HRESULT hr = CLSIDFromProgID(szProgID, &clsid);
61 ATLASSERT(_p == NULL);
62 if (SUCCEEDED(hr))
63 hr = ::CoCreateInstance(clsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&_p);
64 return hr;
65 }
66 */
67 template <class Q>
QueryInterface(REFGUID iid,Q ** pp)68 HRESULT QueryInterface(REFGUID iid, Q** pp) const throw()
69 {
70 // if (*pp) throw 20220216; // for debug
71 return _p->QueryInterface(iid, (void**)pp);
72 }
73 };
74
75 //////////////////////////////////////////////////////////
76
StringToBstr(LPCOLESTR src,BSTR * bstr)77 inline HRESULT StringToBstr(LPCOLESTR src, BSTR *bstr)
78 {
79 *bstr = ::SysAllocString(src);
80 return (*bstr) ? S_OK : E_OUTOFMEMORY;
81 }
82
83 class CMyComBSTR
84 {
85 BSTR m_str;
CLASS_NO_COPY(CMyComBSTR)86 CLASS_NO_COPY(CMyComBSTR)
87 public:
88 CMyComBSTR(): m_str(NULL) {}
~CMyComBSTR()89 ~CMyComBSTR() { ::SysFreeString(m_str); }
90 BSTR* operator&() { return &m_str; }
LPCOLESTR()91 operator LPCOLESTR() const { return m_str; }
92 // operator bool() const { return m_str != NULL; }
93 // bool operator!() const { return m_str == NULL; }
94
Wipe_and_Free()95 void Wipe_and_Free()
96 {
97 if (m_str)
98 {
99 memset(m_str, 0, ::SysStringLen(m_str) * sizeof(*m_str));
100 Empty();
101 }
102 }
103
104 private:
105 // operator BSTR() const { return m_str; }
106
CMyComBSTR(LPCOLESTR src)107 CMyComBSTR(LPCOLESTR src) { m_str = ::SysAllocString(src); }
108 // CMyComBSTR(int nSize) { m_str = ::SysAllocStringLen(NULL, nSize); }
109 // CMyComBSTR(int nSize, LPCOLESTR sz) { m_str = ::SysAllocStringLen(sz, nSize); }
110 // CMyComBSTR(const CMyComBSTR& src) { m_str = src.MyCopy(); }
111
112 /*
113 CMyComBSTR(REFGUID src)
114 {
115 LPOLESTR szGuid;
116 StringFromCLSID(src, &szGuid);
117 m_str = ::SysAllocString(szGuid);
118 CoTaskMemFree(szGuid);
119 }
120 */
121
122 /*
123 CMyComBSTR& operator=(const CMyComBSTR& src)
124 {
125 if (m_str != src.m_str)
126 {
127 if (m_str)
128 ::SysFreeString(m_str);
129 m_str = src.MyCopy();
130 }
131 return *this;
132 }
133 */
134
135 CMyComBSTR& operator=(LPCOLESTR src)
136 {
137 ::SysFreeString(m_str);
138 m_str = ::SysAllocString(src);
139 return *this;
140 }
141
Len()142 unsigned Len() const { return ::SysStringLen(m_str); }
143
MyCopy()144 BSTR MyCopy() const
145 {
146 // We don't support Byte BSTRs here
147 return ::SysAllocStringLen(m_str, ::SysStringLen(m_str));
148 /*
149 UINT byteLen = ::SysStringByteLen(m_str);
150 BSTR res = ::SysAllocStringByteLen(NULL, byteLen);
151 if (res && byteLen != 0 && m_str)
152 memcpy(res, m_str, byteLen);
153 return res;
154 */
155 }
156
157 /*
158 void Attach(BSTR src) { m_str = src; }
159 BSTR Detach()
160 {
161 BSTR s = m_str;
162 m_str = NULL;
163 return s;
164 }
165 */
166
Empty()167 void Empty()
168 {
169 ::SysFreeString(m_str);
170 m_str = NULL;
171 }
172 };
173
174
175 class CMyComBSTR_Wipe: public CMyComBSTR
176 {
CLASS_NO_COPY(CMyComBSTR_Wipe)177 CLASS_NO_COPY(CMyComBSTR_Wipe)
178 public:
179 CMyComBSTR_Wipe(): CMyComBSTR() {}
~CMyComBSTR_Wipe()180 ~CMyComBSTR_Wipe() { Wipe_and_Free(); }
181 };
182
183
184
185 /*
186 If CMyUnknownImp doesn't use virtual destructor, the code size is smaller.
187 But if some class_1 derived from CMyUnknownImp
188 uses MY_ADDREF_RELEASE and IUnknown::Release()
189 and some another class_2 is derived from class_1,
190 then class_1 must use virtual destructor:
191 virtual ~class_1();
192 In that case, class_1::Release() calls correct destructor of class_2.
193
194 We use virtual ~CMyUnknownImp() to disable warning
195 "class has virtual functions, but destructor is not virtual".
196
197 also we can use virtual ~IUnknown() {} in MyWindows.h
198 */
199
200 class CMyUnknownImp
201 {
CLASS_NO_COPY(CMyUnknownImp)202 CLASS_NO_COPY(CMyUnknownImp)
203 public:
204 ULONG __m_RefCount;
205 CMyUnknownImp(): __m_RefCount(0) {}
206
207 #ifdef _WIN32
208 #if defined(__GNUC__) || defined(__clang__)
209 virtual // to disable GCC/CLANG varnings
210 #endif
211 #endif
~CMyUnknownImp()212 ~CMyUnknownImp() {}
213 };
214
215
216
217 #define MY_QUERYINTERFACE_BEGIN STDMETHOD(QueryInterface) \
218 (REFGUID iid, void **outObject) throw() { *outObject = NULL;
219
220 #define MY_QUERYINTERFACE_ENTRY(i) else if (iid == IID_ ## i) \
221 { *outObject = (void *)(i *)this; }
222
223 #define MY_QUERYINTERFACE_ENTRY_UNKNOWN(i) if (iid == IID_IUnknown) \
224 { *outObject = (void *)(IUnknown *)(i *)this; }
225
226 #define MY_QUERYINTERFACE_BEGIN2(i) MY_QUERYINTERFACE_BEGIN \
227 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i) \
228 MY_QUERYINTERFACE_ENTRY(i)
229
230 #define MY_QUERYINTERFACE_END else return E_NOINTERFACE; ++__m_RefCount; /* AddRef(); */ return S_OK; }
231
232 #define MY_ADDREF_RELEASE \
233 STDMETHOD_(ULONG, AddRef)() throw() { return ++__m_RefCount; } \
234 STDMETHOD_(ULONG, Release)() { if (--__m_RefCount != 0) return __m_RefCount; \
235 delete this; return 0; }
236
237 #define MY_UNKNOWN_IMP_SPEC(i) \
238 MY_QUERYINTERFACE_BEGIN \
239 i \
240 MY_QUERYINTERFACE_END \
241 MY_ADDREF_RELEASE
242
243
244 #define MY_UNKNOWN_IMP MY_QUERYINTERFACE_BEGIN \
245 MY_QUERYINTERFACE_ENTRY_UNKNOWN(IUnknown) \
246 MY_QUERYINTERFACE_END \
247 MY_ADDREF_RELEASE
248
249 #define MY_UNKNOWN_IMP1(i) MY_UNKNOWN_IMP_SPEC( \
250 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i) \
251 MY_QUERYINTERFACE_ENTRY(i) \
252 )
253
254 #define MY_UNKNOWN_IMP2(i1, i2) MY_UNKNOWN_IMP_SPEC( \
255 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
256 MY_QUERYINTERFACE_ENTRY(i1) \
257 MY_QUERYINTERFACE_ENTRY(i2) \
258 )
259
260 #define MY_UNKNOWN_IMP3(i1, i2, i3) MY_UNKNOWN_IMP_SPEC( \
261 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
262 MY_QUERYINTERFACE_ENTRY(i1) \
263 MY_QUERYINTERFACE_ENTRY(i2) \
264 MY_QUERYINTERFACE_ENTRY(i3) \
265 )
266
267 #define MY_UNKNOWN_IMP4(i1, i2, i3, i4) MY_UNKNOWN_IMP_SPEC( \
268 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
269 MY_QUERYINTERFACE_ENTRY(i1) \
270 MY_QUERYINTERFACE_ENTRY(i2) \
271 MY_QUERYINTERFACE_ENTRY(i3) \
272 MY_QUERYINTERFACE_ENTRY(i4) \
273 )
274
275 #define MY_UNKNOWN_IMP5(i1, i2, i3, i4, i5) MY_UNKNOWN_IMP_SPEC( \
276 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
277 MY_QUERYINTERFACE_ENTRY(i1) \
278 MY_QUERYINTERFACE_ENTRY(i2) \
279 MY_QUERYINTERFACE_ENTRY(i3) \
280 MY_QUERYINTERFACE_ENTRY(i4) \
281 MY_QUERYINTERFACE_ENTRY(i5) \
282 )
283
284 #define MY_UNKNOWN_IMP6(i1, i2, i3, i4, i5, i6) MY_UNKNOWN_IMP_SPEC( \
285 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
286 MY_QUERYINTERFACE_ENTRY(i1) \
287 MY_QUERYINTERFACE_ENTRY(i2) \
288 MY_QUERYINTERFACE_ENTRY(i3) \
289 MY_QUERYINTERFACE_ENTRY(i4) \
290 MY_QUERYINTERFACE_ENTRY(i5) \
291 MY_QUERYINTERFACE_ENTRY(i6) \
292 )
293
294 #define MY_UNKNOWN_IMP7(i1, i2, i3, i4, i5, i6, i7) MY_UNKNOWN_IMP_SPEC( \
295 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
296 MY_QUERYINTERFACE_ENTRY(i1) \
297 MY_QUERYINTERFACE_ENTRY(i2) \
298 MY_QUERYINTERFACE_ENTRY(i3) \
299 MY_QUERYINTERFACE_ENTRY(i4) \
300 MY_QUERYINTERFACE_ENTRY(i5) \
301 MY_QUERYINTERFACE_ENTRY(i6) \
302 MY_QUERYINTERFACE_ENTRY(i7) \
303 )
304
305 const HRESULT k_My_HRESULT_WritingWasCut = 0x20000010;
306
307 #endif
308