向CCmdTarget的派生类添加一个接口的实现,向CCmdTarget的派生类添加一个接口的实现
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DECLARE_INTERFACE_MAP() //声明接口映射(2)CSampleView类实现中加入以下代码:
BEGIN_INTERFACE_MAP(CSampleView, CCmdTarget)
INTERFACE_PART(CSampleView, IID_IMyTest, TestInterface)
END_INTERFACE_MAP()
STDMETHODIMP_(ULONG) CSampleView::XTestInterface::AddRef( )
{
METHOD_PROLOGUE_EX(CSampleView, TestInterface)
return (ULONG)pThis->ExternalAddRef();
}
STDMETHODIMP_(ULONG) CSampleView::XTestInterface::Release( )
{
METHOD_PROLOGUE_EX(CSampleView, TestInterface)
return (ULONG)pThis->ExternalRelease();
}
STDMETHODIMP CSampleView::XTestInterface::QueryInterface( REFIID iid, LPVOID FAR* ppvObj )
{
METHOD_PROLOGUE_EX(CSampleView, TestInterface)
return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj) ;
}
STDMETHODIMP CSampleView::XTestInterface::Test()
{
METHOD_PROLOGUE_EX(CSampleView, TestInterface)
// do something you like
return S_OK ;
}
揭开宏的神秘面纱,看看它到底是什么东西。以下都是简化的版本。
(本文来源于图老师网站,更多请访问http://www.tulaoshi.com)(1)DECLARE_INTERFACE_MAP
struct AFX_INTERFACEMAP_ENTRY
{
const void* piid;
// the interface id (IID) (NULL for aggregate)
size_t nOffset;
// offset of the interface vtable from m_unknown
};
struct AFX_INTERFACEMAP
{
const AFX_INTERFACEMAP* (PASCAL* pfnGetBaseMap)(); // NULL is root class
const AFX_INTERFACEMAP_ENTRY* pEntry; // map for this class
};
#define DECLARE_INTERFACE_MAP()
private:
static const AFX_INTERFACEMAP_ENTRY _interfaceEntries[];
protected:
static AFX_DATA const AFX_INTERFACEMAP interfaceMap;
static const AFX_INTERFACEMAP* PASCAL _GetBaseInterfaceMap();
virtual const AFX_INTERFACEMAP* GetInterfaceMap() const;
(2)BEGIN_INTERFACE_PART/END_INTERFACE_PART
#define BEGIN_INTERFACE_PART(localClass, baseClass) // 定义了一个嵌套类
class X##localClass : public baseClass
{
public:
STDMETHOD_(ULONG, AddRef)();
STDMETHOD_(ULONG, Release)();
STDMETHOD(QueryInterface)(REFIID iid, LPVOID* ppvObj);
#define END_INTERFACE_PART(localClass)
} m_x##localClass;
friend class X##localClass;
(3)BEGIN_INTERFACE_MAP/INTERFACE_PART/END_INTERFACE_MAP
#define offsetof(s,m) (size_t)&(((s *)0)->m)
#define BEGIN_INTERFACE_MAP(theClass, theBase)
const AFX_INTERFACEMAP* PASCAL theClass::_GetBaseInterfaceMap()
{ return &theBase::interfaceMap; }
const AFX_INTERFACEMAP* theClass::GetInterfaceMap() const
{ return &theClass::interfaceMap; }
AFX_COMDAT const AFX_DATADEF AFX_INTERFACEMAP theClass::inter
来源:http://www.tulaoshi.com/n/20160129/1487159.html
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