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 return _p->QueryInterface(iid, (void**)pp);
71 }
72 };
73
74 //////////////////////////////////////////////////////////
75
StringToBstr(LPCOLESTR src,BSTR * bstr)76 inline HRESULT StringToBstr(LPCOLESTR src, BSTR *bstr)
77 {
78 *bstr = ::SysAllocString(src);
79 return (*bstr) ? S_OK : E_OUTOFMEMORY;
80 }
81
82 class CMyComBSTR
83 {
84 BSTR m_str;
CLASS_NO_COPY(CMyComBSTR)85 CLASS_NO_COPY(CMyComBSTR)
86 public:
87 CMyComBSTR(): m_str(NULL) {}
~CMyComBSTR()88 ~CMyComBSTR() { ::SysFreeString(m_str); }
89 BSTR* operator&() { return &m_str; }
LPCOLESTR()90 operator LPCOLESTR() const { return m_str; }
91 // operator bool() const { return m_str != NULL; }
92 // bool operator!() const { return m_str == NULL; }
93
Wipe_and_Free()94 void Wipe_and_Free()
95 {
96 if (m_str)
97 {
98 memset(m_str, 0, ::SysStringLen(m_str) * sizeof(*m_str));
99 Empty();
100 }
101 }
102
103 private:
104 // operator BSTR() const { return m_str; }
105
CMyComBSTR(LPCOLESTR src)106 CMyComBSTR(LPCOLESTR src) { m_str = ::SysAllocString(src); }
107 // CMyComBSTR(int nSize) { m_str = ::SysAllocStringLen(NULL, nSize); }
108 // CMyComBSTR(int nSize, LPCOLESTR sz) { m_str = ::SysAllocStringLen(sz, nSize); }
109 // CMyComBSTR(const CMyComBSTR& src) { m_str = src.MyCopy(); }
110
111 /*
112 CMyComBSTR(REFGUID src)
113 {
114 LPOLESTR szGuid;
115 StringFromCLSID(src, &szGuid);
116 m_str = ::SysAllocString(szGuid);
117 CoTaskMemFree(szGuid);
118 }
119 */
120
121 /*
122 CMyComBSTR& operator=(const CMyComBSTR& src)
123 {
124 if (m_str != src.m_str)
125 {
126 if (m_str)
127 ::SysFreeString(m_str);
128 m_str = src.MyCopy();
129 }
130 return *this;
131 }
132 */
133
134 CMyComBSTR& operator=(LPCOLESTR src)
135 {
136 ::SysFreeString(m_str);
137 m_str = ::SysAllocString(src);
138 return *this;
139 }
140
Len()141 unsigned Len() const { return ::SysStringLen(m_str); }
142
MyCopy()143 BSTR MyCopy() const
144 {
145 // We don't support Byte BSTRs here
146 return ::SysAllocStringLen(m_str, ::SysStringLen(m_str));
147 /*
148 UINT byteLen = ::SysStringByteLen(m_str);
149 BSTR res = ::SysAllocStringByteLen(NULL, byteLen);
150 if (res && byteLen != 0 && m_str)
151 memcpy(res, m_str, byteLen);
152 return res;
153 */
154 }
155
156 /*
157 void Attach(BSTR src) { m_str = src; }
158 BSTR Detach()
159 {
160 BSTR s = m_str;
161 m_str = NULL;
162 return s;
163 }
164 */
165
Empty()166 void Empty()
167 {
168 ::SysFreeString(m_str);
169 m_str = NULL;
170 }
171 };
172
173
174 class CMyComBSTR_Wipe: public CMyComBSTR
175 {
CLASS_NO_COPY(CMyComBSTR_Wipe)176 CLASS_NO_COPY(CMyComBSTR_Wipe)
177 public:
178 CMyComBSTR_Wipe(): CMyComBSTR() {}
~CMyComBSTR_Wipe()179 ~CMyComBSTR_Wipe() { Wipe_and_Free(); }
180 };
181
182
183
184 /*
185 If CMyUnknownImp doesn't use virtual destructor, the code size is smaller.
186 But if some class_1 derived from CMyUnknownImp
187 uses MY_ADDREF_RELEASE and IUnknown::Release()
188 and some another class_2 is derived from class_1,
189 then class_1 must use virtual destructor:
190 virtual ~class_1();
191 In that case, class_1::Release() calls correct destructor of class_2.
192
193 We use virtual ~CMyUnknownImp() to disable warning
194 "class has virtual functions, but destructor is not virtual".
195
196 also we can use virtual ~IUnknown() {} in MyWindows.h
197 */
198
199 class CMyUnknownImp
200 {
CLASS_NO_COPY(CMyUnknownImp)201 CLASS_NO_COPY(CMyUnknownImp)
202 public:
203 ULONG __m_RefCount;
204 CMyUnknownImp(): __m_RefCount(0) {}
205
206 #ifdef _WIN32
207 #if defined(__GNUC__) || defined(__clang__)
208 virtual // to disable GCC/CLANG varnings
209 #endif
210 #endif
~CMyUnknownImp()211 ~CMyUnknownImp() {}
212 };
213
214
215
216 #define MY_QUERYINTERFACE_BEGIN STDMETHOD(QueryInterface) \
217 (REFGUID iid, void **outObject) throw() { *outObject = NULL;
218
219 #define MY_QUERYINTERFACE_ENTRY(i) else if (iid == IID_ ## i) \
220 { *outObject = (void *)(i *)this; }
221
222 #define MY_QUERYINTERFACE_ENTRY_UNKNOWN(i) if (iid == IID_IUnknown) \
223 { *outObject = (void *)(IUnknown *)(i *)this; }
224
225 #define MY_QUERYINTERFACE_BEGIN2(i) MY_QUERYINTERFACE_BEGIN \
226 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i) \
227 MY_QUERYINTERFACE_ENTRY(i)
228
229 #define MY_QUERYINTERFACE_END else return E_NOINTERFACE; ++__m_RefCount; /* AddRef(); */ return S_OK; }
230
231 #define MY_ADDREF_RELEASE \
232 STDMETHOD_(ULONG, AddRef)() throw() { return ++__m_RefCount; } \
233 STDMETHOD_(ULONG, Release)() { if (--__m_RefCount != 0) return __m_RefCount; \
234 delete this; return 0; }
235
236 #define MY_UNKNOWN_IMP_SPEC(i) \
237 MY_QUERYINTERFACE_BEGIN \
238 i \
239 MY_QUERYINTERFACE_END \
240 MY_ADDREF_RELEASE
241
242
243 #define MY_UNKNOWN_IMP MY_QUERYINTERFACE_BEGIN \
244 MY_QUERYINTERFACE_ENTRY_UNKNOWN(IUnknown) \
245 MY_QUERYINTERFACE_END \
246 MY_ADDREF_RELEASE
247
248 #define MY_UNKNOWN_IMP1(i) MY_UNKNOWN_IMP_SPEC( \
249 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i) \
250 MY_QUERYINTERFACE_ENTRY(i) \
251 )
252
253 #define MY_UNKNOWN_IMP2(i1, i2) MY_UNKNOWN_IMP_SPEC( \
254 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
255 MY_QUERYINTERFACE_ENTRY(i1) \
256 MY_QUERYINTERFACE_ENTRY(i2) \
257 )
258
259 #define MY_UNKNOWN_IMP3(i1, i2, i3) MY_UNKNOWN_IMP_SPEC( \
260 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
261 MY_QUERYINTERFACE_ENTRY(i1) \
262 MY_QUERYINTERFACE_ENTRY(i2) \
263 MY_QUERYINTERFACE_ENTRY(i3) \
264 )
265
266 #define MY_UNKNOWN_IMP4(i1, i2, i3, i4) MY_UNKNOWN_IMP_SPEC( \
267 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
268 MY_QUERYINTERFACE_ENTRY(i1) \
269 MY_QUERYINTERFACE_ENTRY(i2) \
270 MY_QUERYINTERFACE_ENTRY(i3) \
271 MY_QUERYINTERFACE_ENTRY(i4) \
272 )
273
274 #define MY_UNKNOWN_IMP5(i1, i2, i3, i4, i5) MY_UNKNOWN_IMP_SPEC( \
275 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
276 MY_QUERYINTERFACE_ENTRY(i1) \
277 MY_QUERYINTERFACE_ENTRY(i2) \
278 MY_QUERYINTERFACE_ENTRY(i3) \
279 MY_QUERYINTERFACE_ENTRY(i4) \
280 MY_QUERYINTERFACE_ENTRY(i5) \
281 )
282
283 #define MY_UNKNOWN_IMP6(i1, i2, i3, i4, i5, i6) MY_UNKNOWN_IMP_SPEC( \
284 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
285 MY_QUERYINTERFACE_ENTRY(i1) \
286 MY_QUERYINTERFACE_ENTRY(i2) \
287 MY_QUERYINTERFACE_ENTRY(i3) \
288 MY_QUERYINTERFACE_ENTRY(i4) \
289 MY_QUERYINTERFACE_ENTRY(i5) \
290 MY_QUERYINTERFACE_ENTRY(i6) \
291 )
292
293 #define MY_UNKNOWN_IMP7(i1, i2, i3, i4, i5, i6, i7) MY_UNKNOWN_IMP_SPEC( \
294 MY_QUERYINTERFACE_ENTRY_UNKNOWN(i1) \
295 MY_QUERYINTERFACE_ENTRY(i1) \
296 MY_QUERYINTERFACE_ENTRY(i2) \
297 MY_QUERYINTERFACE_ENTRY(i3) \
298 MY_QUERYINTERFACE_ENTRY(i4) \
299 MY_QUERYINTERFACE_ENTRY(i5) \
300 MY_QUERYINTERFACE_ENTRY(i6) \
301 MY_QUERYINTERFACE_ENTRY(i7) \
302 )
303
304 const HRESULT k_My_HRESULT_WritingWasCut = 0x20000010;
305
306 #endif
307