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<html>
<head>
<meta http-equiv="Content-Language" content="zh-cn">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>COM 学习笔记</title>
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<p align="center"><b><font size="7">COM 学习笔记</font></b></p>
<p align="center">康 林 2004年11月</p>
<p align="left">关键词：组件、接口、动态链接库、注册表、CLSID、GUID、IID、UUID</p>
<ol dynamicoutline initcollapsed type="I" style ="cursor:hand">
<li>
<p align="left"><b>概念：</b></p>
</li>
<ol>
<li>
<p align="left"><b>类型库：</b></p></li>
<li>
<p align="left"><b>组件：</b>是一个接口的集合。</p></li>
<li>
<p align="left"><b>接口：</b>是一个包含一个函数接针数组的内存结构。每一个数组元素包含的是一个由组件所实现的函数的地址。</p>
</li>
<p align="left"><font color="#FF0000">组件是接口的集合,接口是函数的集合。</font></p>
</ol>
<li>
<p align="left"><b>QueryInterface 的实现规则:</b></p>
</li>
<ol>
<li>
<p align="left">QueryInterface 返回的总是同一个 IUnknown 指针。</li>
<li>
<p align="left">若客户曾经获得过某个接口，那么它将总能获取此接口。</li>
<li>
<p align="left">客户可以再次获得已经拥有的接口。</li>
<li>
<p align="left">客户可以返回到起始接口。</li>
<li>
<p align="left">若能够从某个接口获得某按按特定接口，那么可以从任意接口都将可以获得此接口。</li>
</ol>
<li>
<p align="left"><b>
<a href="ms-help://MS.VSCC.2003/MS.MSDNQTR.2003FEB.2052/dnduwam/html/d35remot.htm">ProgID</a> 与 CLSID的转换：</b></p>
</li>
<ol>
<li>
<p align="left">ProgIDFromCLSID<br><code><b>HRESULT CLSIDFromProgID(<br> LPCOLESTR</b><i> lpszProgID</i><b>,
</b>//Pointer to the ProgID<br><b> LPCLSID</b><i> pclsid
</i>//Pointer to the CLSID<br><b>);</b></code></li>
<li>
<p align="left">CLSIDFromProgID <br><code><b>WINOLEAPI ProgIDFromCLSID(<br> REFCLSID</b><i> clsid</i><b>,
</b>//CLSID for which the ProgID is
requested<br><b> LPOLESTR *</b><i> lplpszProgID</i><br><i>
</i>//Address of output variable that receives a <br>
// pointer to the requested ProgID string<br><b>);</b><br> </code></li>
</ol>
<li>
<p align="left"><b>CLSID 与字符串的转换：</b></p>
</li>
<ol>
<li>
<p align="left">CLSIDFromString<code><b><br>HRESULT CLSIDFromString(<br> LPOLESTR</b><i> lpsz</i><b>,
</b>//Pointer to the string
representation of the CLSID<br><b> LPCLSID</b><i> pclsid </i>//Pointer to the CLSID<br>
<b>);</b></code></li>
<li>
<p align="left">StringFromCLSID<br><code><b>WINOLEAPI StringFromCLSID(<br> REFCLSID</b><i> rclsid</i><b>,
</b>//CLSID to be converted<br><b> LPOLESTR *</b><i> ppsz </i>//Address of output variable that
receives a <br>
// pointer to the resulting string<br><b>);</b></code></li>
<li>
<p align="left">StringFromGUID2<br><code><b>int StringFromGUID2(<br> REFGUID</b><i> rguid</i><b>,
</b>//Interface identifier to be
converted<br><b> LPOLESTR</b><i> lpsz</i><b>, </b>//Pointer to the resulting
string on return<br><b> int</b><i> cchMax
</i>//Character count of string at <i>lpsz</i><br><b>);</b><br> </code></li>
<li>
<p align="left">StringFromIID <br><code><b>WINOLEAPI StringFromIID(<br> REFIID</b><i> rclsid</i><b>,
</b>//Interface
identifier to be converted<br><b> LPOLESTR *</b><i> lplpsz </i>//Address of output variable
that receives a <br>
// pointer to the resulting string<br><b>);</b></code></li>
<li>
<p align="left">IIDFromString<br><code><b>WINOLEAPI IIDFromString(<br> LPOLESTR</b><i> lpsz</i><b>,
</b>//Pointer to the string
representation of the IID<br><b> LPIID</b><i> lpiid
</i>//Pointer to the
requested IID on return<br><b>);</b></code></li>
</ol>
<li>
<p align="left"><b>注册：</b></p>
</li>
<ol>
<li>
<p align="left">用程序注册：regsvr32.exe</li>
<li>
<p align="left">调用动态函数库中的注册函数：DllRegisterServer</li>
<li>
<p align="left">调用动态函数库中的反注册函数:DllUnregisterServer </li>
</ol>
<li>
<p align="left"><b>COM库函数:</b></p>
</li>
<ol>
<li>
<p align="left">CoCreateInstance<br><code><b> STDAPI CoCreateInstance(<br> REFCLSID</b><i> rclsid</i><b>,
</b>//Class identifier (CLSID) of the object<br><b> LPUNKNOWN</b><i> pUnkOuter</i><b>,
</b>//Pointer
to whether object is or isn't part <br>
// of an aggregate<br><b> DWORD</b><i> dwClsContext</i><b>,
</b>//Context for running executable code<br><b> REFIID</b><i> riid</i><b>,
</b>//Reference to the identifier of the interface<br><b> LPVOID *</b><i> ppv
</i>//Address of output variable that receives <br>
// the interface pointer requested in <i>riid</i><br><b> );<br></b>CoCreateInstance 实际上是调用
</code>CoGetClassObject 实现的。CoGetClassObject
将在注册表中查找指定的组件。找到之后，它将装载实现此组件的 DLL（用 <b>CoLoadLibrary</b>)。装载成功之后，它将调用在 DLL
服务器中的实现的 DllGetClassObject。此函数的作用是创建相应的类厂。另外 DllGetClassObject 还将查询
IClassFactory 接口，并将其返回给 CoCreateInstance。然后，CoCreatInstnce 将使用此接口来调用
IClassFactory::CreateInstance 函数。并查询指 CoCreateInstance 参数 riid
中指定的接口。在得到了此接口之后，CoCreateInstance
将释放相应的类厂并将此接口的指针返回给客户。然后客户就能使用此指针来调用组件中的某个方法了。</li>
<li>
<p align="left">CoGetClassObject<br><code><b>STDAPI CoGetClassObject(<br> REFCLSID</b><i> rclsid</i><b>,
</b>//CLSID associated with the
class object<br><b> DWORD</b><i> dwClsContext</i><b>,</b><br><b>
</b>//Context for running executable code<br><b> COSERVERINFO *</b><i> pServerInfo</i><b>,</b><br>
<b>
</b>//Pointer to machine on which the object is to <br>
// be instantiated<br><b> REFIID</b><i> riid</i><b>,
</b>//Reference to the identifier of the interface<br><b> LPVOID *</b><i> ppv
</i>//Address of
output variable that receives the <br>
// interface pointer requested in <i>riid</i><br><b>);</b></code></li>
<li>CoFreeUnusedLibraries：释放不再使用的DLL<br> </li>
</ol>
<li>
<b>包容与聚合：</b>
</li>
<li>
<p align="left"><b>接口指针类(智能接口指针):</b></p>
</li>
<ol>
<li>
<p align="left">ATL中有 CComPrt 和 CComQIprt(<span class="ShowLink" onclick="Call Show(ccomptr_h)">#include <ATLBASE.H></span>)
<table border="1" width="100%" class="TableStyle" style ="display:none" id="ccomptr_h">
<tr>
<td>
<pre>template <class T>
class CComPtr
{
public:
typedef T _PtrClass;
CComPtr()
{
p=NULL;
}
CComPtr(T* lp)
{
if ((p = lp) != NULL)
p->AddRef();
}
CComPtr(const CComPtr<T>& lp)
{
if ((p = lp.p) != NULL)
p->AddRef();
}
~CComPtr()
{
if (p)
p->Release();
}
void Release()
{
IUnknown* pTemp = p;
if (pTemp)
{
p = NULL;
pTemp->Release();
}
}
operator T*() const
{
return (T*)p;
}
T& operator*() const
{
ATLASSERT(p!=NULL);
return *p;
}
//The assert on operator& usually indicates a bug. If this is really
//what is needed, however, take the address of the p member explicitly.
T** operator&()
{
ATLASSERT(p==NULL);
return &p;
}
_NoAddRefReleaseOnCComPtr<T>* operator->() const
{
ATLASSERT(p!=NULL);
return (_NoAddRefReleaseOnCComPtr<T>*)p;
}
T* operator=(T* lp)
{
return (T*)AtlComPtrAssign((IUnknown**)&p, lp);
}
T* operator=(const CComPtr<T>& lp)
{
return (T*)AtlComPtrAssign((IUnknown**)&p, lp.p);
}
bool operator!() const
{
return (p == NULL);
}
bool operator<(T* pT) const
{
return p < pT;
}
bool operator==(T* pT) const
{
return p == pT;
}
// Compare two objects for equivalence
bool IsEqualObject(IUnknown* pOther)
{
if (p == NULL && pOther == NULL)
return true; // They are both NULL objects</pre>
<pre> if (p == NULL || pOther == NULL)
return false; // One is NULL the other is not</pre>
<pre> CComPtr<IUnknown> punk1;
CComPtr<IUnknown> punk2;
p->QueryInterface(IID_IUnknown, (void**)&punk1);
pOther->QueryInterface(IID_IUnknown, (void**)&punk2);
return punk1 == punk2;
}
void Attach(T* p2)
{
if (p)
p->Release();
p = p2;
}
T* Detach()
{
T* pt = p;
p = NULL;
return pt;
}
HRESULT CopyTo(T** ppT)
{
ATLASSERT(ppT != NULL);
if (ppT == NULL)
return E_POINTER;
*ppT = p;
if (p)
p->AddRef();
return S_OK;
}
HRESULT SetSite(IUnknown* punkParent)
{
return AtlSetChildSite(p, punkParent);
}
HRESULT Advise(IUnknown* pUnk, const IID& iid, LPDWORD pdw)
{
return AtlAdvise(p, pUnk, iid, pdw);
}
HRESULT CoCreateInstance(REFCLSID rclsid, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
{
ATLASSERT(p == NULL);
return ::CoCreateInstance(rclsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&p);
}
HRESULT CoCreateInstance(LPCOLESTR szProgID, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
{
CLSID clsid;
HRESULT hr = CLSIDFromProgID(szProgID, &clsid);
ATLASSERT(p == NULL);
if (SUCCEEDED(hr))
hr = ::CoCreateInstance(clsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&p);
return hr;
}
template <class Q>
HRESULT QueryInterface(Q** pp) const
{
ATLASSERT(pp != NULL && *pp == NULL);
return p->QueryInterface(__uuidof(Q), (void**)pp);
}
T* p;
};
</pre>
<pre>template <class T, const IID* piid = &__uuidof(T)>
class CComQIPtr
{
public:
typedef T _PtrClass;
CComQIPtr()
{
p=NULL;
}
CComQIPtr(T* lp)
{
if ((p = lp) != NULL)
p->AddRef();
}
CComQIPtr(const CComQIPtr<T,piid>& lp)
{
if ((p = lp.p) != NULL)
p->AddRef();
}
CComQIPtr(IUnknown* lp)
{
p=NULL;
if (lp != NULL)
lp->QueryInterface(*piid, (void **)&p);
}
~CComQIPtr()
{
if (p)
p->Release();
}
void Release()
{
IUnknown* pTemp = p;
if (pTemp)
{
p = NULL;
pTemp->Release();
}
}
operator T*() const
{
return p;
}
T& operator*() const
{
ATLASSERT(p!=NULL); return *p;
}
//The assert on operator& usually indicates a bug. If this is really
//what is needed, however, take the address of the p member explicitly.
T** operator&()
{
ATLASSERT(p==NULL);
return &p;
}
_NoAddRefReleaseOnCComPtr<T>* operator->() const
{
ATLASSERT(p!=NULL);
return (_NoAddRefReleaseOnCComPtr<T>*)p;
}
T* operator=(T* lp)
{
return (T*)AtlComPtrAssign((IUnknown**)&p, lp);
}
T* operator=(const CComQIPtr<T,piid>& lp)
{
return (T*)AtlComPtrAssign((IUnknown**)&p, lp.p);
}
T* operator=(IUnknown* lp)
{
return (T*)AtlComQIPtrAssign((IUnknown**)&p, lp, *piid);
}
bool operator!() const
{
return (p == NULL);
}
bool operator<(T* pT) const
{
return p < pT;
}
bool operator==(T* pT) const
{
return p == pT;
}
// Compare two objects for equivalence
bool IsEqualObject(IUnknown* pOther)
{
if (p == NULL && pOther == NULL)
return true; // They are both NULL objects</pre>
<pre> if (p == NULL || pOther == NULL)
return false; // One is NULL the other is not</pre>
<pre> CComPtr<IUnknown> punk1;
CComPtr<IUnknown> punk2;
p->QueryInterface(IID_IUnknown, (void**)&punk1);
pOther->QueryInterface(IID_IUnknown, (void**)&punk2);
return punk1 == punk2;
}
void Attach(T* p2)
{
if (p)
p->Release();
p = p2;
}
T* Detach()
{
T* pt = p;
p = NULL;
return pt;
}
HRESULT CopyTo(T** ppT)
{
ATLASSERT(ppT != NULL);
if (ppT == NULL)
return E_POINTER;
*ppT = p;
if (p)
p->AddRef();
return S_OK;
}
HRESULT SetSite(IUnknown* punkParent)
{
return AtlSetChildSite(p, punkParent);
}
HRESULT Advise(IUnknown* pUnk, const IID& iid, LPDWORD pdw)
{
return AtlAdvise(p, pUnk, iid, pdw);
}
HRESULT CoCreateInstance(REFCLSID rclsid, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
{
ATLASSERT(p == NULL);
return ::CoCreateInstance(rclsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&p);
}
HRESULT CoCreateInstance(LPCOLESTR szProgID, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
{
CLSID clsid;
HRESULT hr = CLSIDFromProgID(szProgID, &clsid);
ATLASSERT(p == NULL);
if (SUCCEEDED(hr))
hr = ::CoCreateInstance(clsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&p);
return hr;
}
template <class Q>
HRESULT QueryInterface(Q** pp)
{
ATLASSERT(pp != NULL && *pp == NULL);
return p->QueryInterface(__uuidof(Q), (void**)pp);
}
T* p;
};</pre>
<pre>//Specialization to make it work
template<>
class CComQIPtr<IUnknown, &IID_IUnknown>
{
public:
typedef IUnknown _PtrClass;
CComQIPtr()
{
p=NULL;
}
CComQIPtr(IUnknown* lp)
{
//Actually do a QI to get identity
p=NULL;
if (lp != NULL)
lp->QueryInterface(IID_IUnknown, (void **)&p);
}
CComQIPtr(const CComQIPtr<IUnknown,&IID_IUnknown>& lp)
{
if ((p = lp.p) != NULL)
p->AddRef();
}
~CComQIPtr()
{
if (p)
p->Release();
}
void Release()
{
IUnknown* pTemp = p;
if (pTemp)
{
p = NULL;
pTemp->Release();
}
}
operator IUnknown*() const
{
return p;
}
IUnknown& operator*() const
{
ATLASSERT(p!=NULL);
return *p;
}
//The assert on operator& usually indicates a bug. If this is really
//what is needed, however, take the address of the p member explicitly.
IUnknown** operator&()
{
ATLASSERT(p==NULL);
return &p;
}
_NoAddRefReleaseOnCComPtr<T>* operator->() const
{
ATLASSERT(p!=NULL);
return (_NoAddRefReleaseOnCComPtr<T>*)p;
}
IUnknown* operator=(IUnknown* lp)
{
//Actually do a QI to get identity
return (IUnknown*)AtlComQIPtrAssign((IUnknown**)&p, lp, IID_IUnknown);
}
IUnknown* operator=(const CComQIPtr<IUnknown,&IID_IUnknown>& lp)
{
return (IUnknown*)AtlComPtrAssign((IUnknown**)&p, lp.p);
}
bool operator!() const
{
return (p == NULL);
}
bool operator<(IUnknown* pT) const
{
return p < pT;
}
bool operator==(IUnknown* pT) const
{
return p == pT;
}
// Compare two objects for equivalence
bool IsEqualObject(IUnknown* pOther)
{
if (p == NULL && pOther == NULL)
return true; // They are both NULL objects</pre>
<pre> if (p == NULL || pOther == NULL)
return false; // One is NULL the other is not</pre>
<pre> CComPtr<IUnknown> punk1;
CComPtr<IUnknown> punk2;
p->QueryInterface(IID_IUnknown, (void**)&punk1);
pOther->QueryInterface(IID_IUnknown, (void**)&punk2);
return punk1 == punk2;
}
IUnknown* Detach()
{
IUnknown* pt = p;
p = NULL;
return pt;
}
HRESULT CopyTo(T** ppT)
{
ATLASSERT(ppT != NULL);
if (ppT == NULL)
return E_POINTER;
*ppT = p;
if (p)
p->AddRef();
return S_OK;
}
HRESULT SetSite(IUnknown* punkParent)
{
return AtlSetChildSite(p, punkParent);
}
HRESULT Advise(IUnknown* pUnk, const IID& iid, LPDWORD pdw)
{
return AtlAdvise(p, pUnk, iid, pdw);
}
HRESULT CoCreateInstance(REFCLSID rclsid, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
{
ATLASSERT(p == NULL);
return ::CoCreateInstance(rclsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&p);
}
HRESULT CoCreateInstance(LPCOLESTR szProgID, LPUNKNOWN pUnkOuter = NULL, DWORD dwClsContext = CLSCTX_ALL)
{
CLSID clsid;
HRESULT hr = CLSIDFromProgID(szProgID, &clsid);
ATLASSERT(p == NULL);
if (SUCCEEDED(hr))
hr = ::CoCreateInstance(clsid, pUnkOuter, dwClsContext, __uuidof(T), (void**)&p);
return hr;
}
template <class Q>
HRESULT QueryInterface(Q** pp)
{
ATLASSERT(pp != NULL && *pp == NULL);
return p->QueryInterface(__uuidof(Q), (void**)pp);
}
IUnknown* p;
};</pre>
<pre>#define com_cast CComQIPtr</pre>
</td>
</tr>
</table>
</li>
<li>
<p align="left">MFC中有CIP(<span class="ShowLink" onclick ="Call Show(afxcom_h)" >#include <afxcom_.h></span>)<table border="1" width="100%" id ="afxcom_h" class="TableStyle" style ="display:none">
<tr>
<td>
<pre>// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.</pre>
<pre>/////////////////////////////////////////////////////////////////////////////
// AFXCOM_.H
//
// THIS FILE IS FOR MFC IMPLEMENTATION ONLY.</pre>
<pre>#ifndef __AFXCOM_H__
#define __AFXCOM_H__</pre>
<pre>#ifndef _OBJBASE_H_
#include <objbase.h>
#endif</pre>
<pre>/////////////////////////////////////////////////////////////////////////////</pre>
<pre>#ifdef _AFX_MINREBUILD
#pragma component(minrebuild, off)
#endif
#ifndef _AFX_FULLTYPEINFO
#pragma component(mintypeinfo, on)
#endif</pre>
<pre>/////////////////////////////////////////////////////////////////////////////</pre>
<pre>#ifndef _AFX_NOFORCE_LIBS
#pragma comment(lib, "uuid.lib")
#endif</pre>
<pre>/////////////////////////////////////////////////////////////////////////////</pre>
<pre>#ifdef _AFX_PACKING
#pragma pack(push, _AFX_PACKING)
#endif</pre>
<pre>#ifndef ASSERT
#ifndef _INC_CRTDBG
#include <crtdbg.h>
#endif // _INC_CRTDBG
#define ASSERT(x) _ASSERT(x)
#endif // ASSERT</pre>
<pre>/////////////////////////////////////////////////////////////////////////////</pre>
<pre>template<class _Interface, const IID* _IID>
class _CIP
{
public:
// Declare interface type so that the type may be available outside
// the scope of this template.
typedef _Interface Interface;</pre>
<pre> // When the compiler supports references in template params,
// _CLSID will be changed to a reference. To avoid conversion
// difficulties this function should be used to obtain the
// CLSID.
static const IID& GetIID()
{ ASSERT(_IID != NULL); return *_IID; }</pre>
<pre> // Construct empty in preparation for assignment.
_CIP();</pre>
<pre> // Copy the pointer and AddRef().
_CIP(const _CIP& cp) : _pInterface(cp._pInterface)
{ _AddRef(); }</pre>
<pre> // Saves and AddRef()'s the interface
_CIP(Interface* pInterface) : _pInterface(pInterface)
{ _AddRef(); }</pre>
<pre> // Copies the pointer. If bAddRef is TRUE, the interface will
// be AddRef()ed.
_CIP(Interface* pInterface, BOOL bAddRef)
: _pInterface(pInterface)
{
if (bAddRef)
{
ASSERT(pInterface != NULL);
_AddRef();
}
}</pre>
<pre> // Calls CoCreateClass with the provided CLSID.
_CIP(const CLSID& clsid, DWORD dwClsContext = CLSCTX_INPROC_SERVER)
: _pInterface(NULL)
{
CreateObject(clsid, dwClsContext);
}</pre>
<pre> // Calls CoCreateClass with the provided CLSID retrieved from
// the string.
_CIP(LPOLESTR str, DWORD dwClsContext = CLSCTX_INPROC_SERVER)
: _pInterface(NULL)
{
CreateObject(str, dwClsContext);
}</pre>
<pre> // Saves and AddRef()s the interface.
_CIP& operator=(Interface* pInterface)
{
if (_pInterface != pInterface)
{
Interface* pOldInterface = _pInterface;
_pInterface = pInterface;
_AddRef();
if (pOldInterface != NULL)
pOldInterface->Release();
}
return *this;
}</pre>
<pre> // Copies and AddRef()'s the interface.
_CIP& operator=(const _CIP& cp)
{ return operator=(cp._pInterface); }</pre>
<pre> // Releases any current interface and loads the class with the
// provided CLSID.
_CIP& operator=(const CLSID& clsid)
{
CreateObject(clsid);
return *this;
}</pre>
<pre> // Calls CoCreateClass with the provided CLSID retrieved from
// the string.
_CIP& operator=(LPOLESTR str)
{
CreateObject(str);
return *this;
}</pre>
<pre> ~_CIP();</pre>
<pre> // Saves/sets the interface without AddRef()ing. This call
// will release any previously acquired interface.
void Attach(Interface* pInterface)
{
_Release();
_pInterface = pInterface;
}</pre>
<pre> // Saves/sets the interface only AddRef()ing if bAddRef is TRUE.
// This call will release any previously acquired interface.
void Attach(Interface* pInterface, BOOL bAddRef)
{
_Release();
_pInterface = pInterface;
if (bAddRef)
{
ASSERT(pInterface != NULL);
pInterface->AddRef();
}
}</pre>
<pre> // Simply NULL the interface pointer so that it isn't Released()'ed.
void Detach()
{
ASSERT(_pInterface);
_pInterface = NULL;
}</pre>
<pre> // Return the interface. This value may be NULL
operator Interface*() const
{ return _pInterface; }</pre>
<pre> // Queries for the unknown and return it
operator IUnknown*()
{ return _pInterface; }</pre>
<pre> // Provides minimal level assertion before use.
operator Interface&() const
{ ASSERT(_pInterface); return *_pInterface; }</pre>
<pre> // Allows an instance of this class to act as though it were the
// actual interface. Also provides minimal assertion verification.
Interface& operator*() const
{ ASSERT(_pInterface); return *_pInterface; }</pre>
<pre> // Returns the address of the interface pointer contained in this
// class. This is useful when using the COM/OLE interfaces to create
// this interface.
Interface** operator&()
{
_Release();
_pInterface = NULL;
return &_pInterface;
}</pre>
<pre> // Allows this class to be used as the interface itself.
// Also provides simple assertion verification.
Interface* operator->() const
{ ASSERT(_pInterface != NULL); return _pInterface; }</pre>
<pre> // This operator is provided so that simple boolean expressions will
// work. For example: "if (p) ...".
// Returns TRUE if the pointer is not NULL.
operator BOOL() const
{ return _pInterface != NULL; }</pre>
<pre> // Returns TRUE if the interface is NULL.
// This operator will be removed when support for type bool
// is added to the compiler.
BOOL operator!()
{ return _pInterface == NULL; }</pre>
<pre> // Provides assertion verified, Release()ing of this interface.
void Release()
{
ASSERT(_pInterface != NULL);
_pInterface->Release();
_pInterface = NULL;
}</pre>
<pre> // Provides assertion verified AddRef()ing of this interface.
void AddRef()
{ ASSERT(_pInterface != NULL); _pInterface->AddRef(); }</pre>
<pre> // Another way to get the interface pointer without casting.
Interface* GetInterfacePtr() const
{ return _pInterface; }</pre>
<pre> // Loads an interface for the provided CLSID.
// Returns an HRESULT. Any previous interface is released.
HRESULT CreateObject(
const CLSID& clsid, DWORD dwClsContext = CLSCTX_INPROC_SERVER)
{
_Release();
HRESULT hr = CoCreateInstance(clsid, NULL, dwClsContext,
GetIID(), reinterpret_cast<void**>(&_pInterface));
ASSERT(SUCCEEDED(hr));
return hr;
}</pre>
<pre> // Creates the class specified by clsidString. clsidString may
// contain a class id, or a prog id string.
HRESULT CreateObject(
LPOLESTR clsidString, DWORD dwClsContext=CLSCTX_INPROC_SERVER)
{
ASSERT(clsidString != NULL);
CLSID clsid;
HRESULT hr;
if (clsidString[0] == '{')
hr = CLSIDFromString(clsidString, &clsid);
else
hr = CLSIDFromProgID(clsidString, &clsid);
ASSERT(SUCCEEDED(hr));
if (FAILED(hr))
return hr;
return CreateObject(clsid, dwClsContext);
}</pre>
<pre> // Performs a QI on pUnknown for the interface type returned
// for this class. The interface is stored. If pUnknown is
// NULL, or the QI fails, E_NOINTERFACE is returned and
// _pInterface is set to NULL.
HRESULT QueryInterface(IUnknown* pUnknown)
{
if (pUnknown == NULL) // Can't QI NULL
{
operator=(static_cast<Interface*>(NULL));
return E_NOINTERFACE;
}</pre>
<pre> // Query for this interface
Interface* pInterface;
HRESULT hr = pUnknown->QueryInterface(GetIID(),
reinterpret_cast<void**>(&pInterface));
if (FAILED(hr))
{
// If failed initialize interface to NULL and return HRESULT.
Attach(NULL);
return hr;
}</pre>
<pre> // Save the interface without AddRef()ing.
Attach(pInterface);
return hr;
}</pre>
<pre>private:
// Releases only if the interface is not null.
// The interface is not set to NULL.
void _Release()
{
if (_pInterface != NULL)
_pInterface->Release();
}</pre>
<pre> // AddRefs only if the interface is not NULL
void _AddRef()
{
if (_pInterface != NULL)
_pInterface->AddRef();
}</pre>
<pre> // The Interface.
Interface* _pInterface;
}; // class _CIP</pre>
<pre>template<class _Interface, const IID* _IID>
_CIP<_Interface, _IID>::_CIP<_Interface, _IID>()
: _pInterface(NULL)
{
}</pre>
<pre>template<class _Interface, const IID* _IID>
_CIP<_Interface, _IID>::~_CIP<_Interface, _IID>()
{
// If we still have an interface then Release() it. The interface
// may be NULL if Detach() has previously been called, or if it was
// never set.</pre>
<pre> _Release();
}</pre>
<pre>template<class _Interface, const IID* _IID>
class CIP : public _CIP<_Interface, _IID>
{
public:
// Simplified name for base class and provide derived classes
// access to base type
typedef _CIP<_Interface, _IID> BC;</pre>
<pre> // Provideds derived classes access to the interface type.
typedef _Interface Interface;</pre>
<pre> // Construct empty in preparation for assignment.
CIP() { }
~CIP();</pre>
<pre> // Copy the pointer and AddRef().
CIP(const CIP& cp) : _CIP<_Interface, _IID>(cp) { }</pre>
<pre> // Saves and AddRef()s the interface.
CIP(Interface* pInterface) : _CIP<_Interface, _IID>(pInterface) { }</pre>
<pre> // Saves the interface and AddRef()s only if bAddRef is TRUE.
CIP(Interface* pInterface, BOOL bAddRef)
: _CIP<_Interface, _IID>(pInterface, bAddRef) { }</pre>
<pre> // Queries for this interface.
CIP(IUnknown* pUnknown)
{
if (pUnknown == NULL)
return;
Interface* pInterface;
HRESULT hr = pUnknown->QueryInterface(GetIID(),
reinterpret_cast<void**>(&pInterface));
ASSERT(SUCCEEDED(hr));
Attach(pInterface);
}</pre>
<pre> // Creates the interface from the CLSID.
CIP(const CLSID& clsid) : _CIP<_Interface, _IID>(clsid) { }</pre>
<pre> // Creates the interface from the CLSID.
CIP(LPOLESTR str) : _CIP<_Interface, _IID>(str) { }</pre>
<pre> // Copies and AddRef()'s the interface.
CIP& operator=(const CIP& cp)
{ _CIP<_Interface, _IID>::operator=(cp); return *this; }</pre>
<pre> // Saves and AddRef()s the interface.
CIP& operator=(Interface* pInterface)
{ _CIP<_Interface, _IID>::operator=(pInterface); return *this; }</pre>
<pre> CIP& operator=(IUnknown* pUnknown)
{
HRESULT hr = QueryInterface(pUnknown);
ASSERT(SUCCEEDED(hr));
return *this;
}</pre>
<pre> // Releases any current interface and loads the class with the
// provided CLSID.
CIP& operator=(const CLSID& clsid)
{ _CIP<_Interface, _IID>::operator=(clsid); return *this; }</pre>
<pre> // Releases any current interface and loads the class with the
// provided CLSID.
CIP& operator=(LPOLESTR str)
{ _CIP<_Interface, _IID>::operator=(str); return *this; }
}; // class CIP</pre>
<pre>template<class _Interface, const IID* _IID>
CIP<_Interface, _IID>::~CIP()
{
}</pre>
<pre>#if _MSC_VER > 1020
template<>
#endif
class CIP<IUnknown, &IID_IUnknown> : public _CIP<IUnknown, &IID_IUnknown>
{
public:
// Simplified name for base class and provide derived classes
// access to base type
typedef _CIP<IUnknown, &IID_IUnknown> BC;</pre>
<pre> // Provideds derived classes access to the interface type.
typedef IUnknown Interface;</pre>
<pre> // Construct empty in preparation for assignment.
CIP() { }</pre>
<pre> // Copy the pointer and AddRef().
CIP(const CIP& cp) : _CIP<IUnknown, &IID_IUnknown>(cp) { }</pre>
<pre> // Saves and AddRef()s the interface.
CIP(Interface* pInterface)
: _CIP<IUnknown, &IID_IUnknown>(pInterface) { }</pre>
<pre> // Saves and then AddRef()s only if bAddRef is TRUE.
CIP(Interface* pInterface, BOOL bAddRef)
: _CIP<IUnknown, &IID_IUnknown>(pInterface, bAddRef) { }</pre>
<pre> // Creates the interface from the CLSID.
CIP(const CLSID& clsid) : _CIP<IUnknown, &IID_IUnknown>(clsid) { }</pre>
<pre> // Creates the interface from the CLSID.
CIP(LPOLESTR str) : _CIP<IUnknown, &IID_IUnknown>(str) { }</pre>
<pre> // Copies and AddRef()'s the interface.
CIP& operator=(const CIP& cp)
{ _CIP<IUnknown, &IID_IUnknown>::operator=(cp); return *this; }</pre>
<pre> // Saves and AddRef()s the interface. The previously saved
// interface is released.
CIP& operator=(Interface* pInterface)
{ _CIP<IUnknown, &IID_IUnknown>::operator=(pInterface); return *this; }</pre>
<pre> // Releases any current interface and loads the class with the
// provided CLSID.
CIP& operator=(const CLSID& clsid)
{ _CIP<IUnknown, &IID_IUnknown>::operator=(clsid); return *this; }</pre>
<pre> // Releases any current interface and loads the class with the
// provided CLSID.
CIP& operator=(LPOLESTR str)
{ _CIP<IUnknown, &IID_IUnknown>::operator=(str); return *this; }</pre>
<pre> // Queries for the unknown and return it
operator IUnknown*()
{ return GetInterfacePtr(); }</pre>
<pre> // Verifies that pUnknown is not null and performs assignment.
HRESULT QueryInterface(IUnknown* pUnknown)
{
_CIP<IUnknown, &IID_IUnknown>::operator=(pUnknown);
return pUnknown != NULL ? S_OK : E_NOINTERFACE;
}
}; // CIP<IUnknown, &IID_IUnknown></pre>
<pre>#define IPTR(x) CIP<x, &IID_##x>
#define DEFINE_IPTR(x) typedef IPTR(x) x##Ptr;</pre>
<pre>/////////////////////////////////////////////////////////////////////////////</pre>
<pre>#ifdef _AFX_PACKING
#pragma pack(pop)
#endif</pre>
<pre>#ifdef _AFX_MINREBUILD
#pragma component(minrebuild, on)
#endif
#ifndef _AFX_FULLTYPEINFO
#pragma component(mintypeinfo, off)
#endif</pre>
<pre>#endif // __AFXCOM_H__</pre>
<pre>/////////////////////////////////////////////////////////////////////////////</pre>
</td>
</tr>
</table>
</li>
<li>使用接口类的成员函数，用 . 操作符。例如：<br>