1. Implementing COM Objects 主講人：虞台文

2. Content Types of COM Servers Objects with Single interface – Example  Enumerators Objects with Multiple interfaces – Example  Personal Account Server Modules of COM Class Factory & IClassFactory Example  Simple Object Self-Registration InProcess Severs by MFC

3. OLE Object Linking & Embedding Types of COM Servers

4. Using COM Object Client COM Library COM Library Server Object Create object of a CLSID  CoCreateInstance() Locate implementation, and load or launch server  Get object interface pointer, and return to Client  Call interface members 

5. Where is the server located? Client COM Library COM Library Server Object Create object of a CLSID  CoCreateInstance() Locate implementation, and load or launch server  Get object interface pointer, and return to Client  Call interface members 

6. Server Types Client Process Client In-process server In-process server In-process object COM Local object proxy Remote object proxy Local server process Local server Local object COM Stub Remote server process COM Stub Remote Machine RPC Remote server Remote object

7. OLE Object Linking & Embedding Objects with Single Interface

8. Template of Enumerators template interface IEnum : IUnknown { virtual HRESULT Next(ULONG celt, ELT_T *rgelt, ULONG *pceltFetched)=0; virtual HRESULT Skip(ULONG celt)=0; virtual HRESULT Reset(void)=0; virtual HRESULT Clone(IEnum ** ppEnum)=0; };

9. IEnumXxx

10. Example: Enumerate Rectangles

13. IEnumRECT // IEmnuRect.h #if !defined(IEnumRECT_HEARDER) #define IEnumRECT_HEARDER #include #undef INTERFACE #define INTERFACE IEnumRECT DECLARE_INTERFACE_(IEnumRECT, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IEnumRECT methods STDMETHOD(Next)(THIS_ DWORD, LPRECT, LPDWORD) PURE; STDMETHOD(Skip)(THIS_ DWORD) PURE; STDMETHOD(Reset)(THIS) PURE; STDMETHOD(Clone)(THIS_ IEnumRECT **) PURE; }; // {6E699FBF-5ED3-44f2-A547-1481C54E130A} DEFINE_GUID(IID_IEnumRECT, 0x6e699fbf, 0x5ed3, 0x44f2, 0xa5, 0x47, 0x14, 0x81, 0xc5, 0x4e, 0x13, 0xa); typedef IEnumRECT * LPENUMRECT; #endif // !defined(IEnumRECT_HEARDER) // IEmnuRect.h #if !defined(IEnumRECT_HEARDER) #define IEnumRECT_HEARDER #include #undef INTERFACE #define INTERFACE IEnumRECT DECLARE_INTERFACE_(IEnumRECT, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IEnumRECT methods STDMETHOD(Next)(THIS_ DWORD, LPRECT, LPDWORD) PURE; STDMETHOD(Skip)(THIS_ DWORD) PURE; STDMETHOD(Reset)(THIS) PURE; STDMETHOD(Clone)(THIS_ IEnumRECT **) PURE; }; // {6E699FBF-5ED3-44f2-A547-1481C54E130A} DEFINE_GUID(IID_IEnumRECT, 0x6e699fbf, 0x5ed3, 0x44f2, 0xa5, 0x47, 0x14, 0x81, 0xc5, 0x4e, 0x13, 0xa); typedef IEnumRECT * LPENUMRECT; #endif // !defined(IEnumRECT_HEARDER)

14. CEnumRect // EnumRect.cpp //..................................... #include #include "IEnumRect.h" class CEnumRect : public IEnumRECT { private: DWORDm_cRef; //Reference count DWORDm_iCur; //Current enum position CArray m_rects;//RECTS we enumerate public: CEnumRect(CArray & rects); virtual ~CEnumRect(); //IUnknown members STDMETHODIMP QueryInterface(REFIID, void **); STDMETHODIMP_(ULONG) AddRef(void); STDMETHODIMP_(ULONG) Release(void); //IEnumRECT members STDMETHODIMP Next(ULONG, LPRECT, ULONG *); STDMETHODIMP Skip(ULONG); STDMETHODIMP Reset(void); STDMETHODIMP Clone(LPENUMRECT *); }; //..................................... // EnumRect.cpp //..................................... #include #include "IEnumRect.h" class CEnumRect : public IEnumRECT { private: DWORDm_cRef; //Reference count DWORDm_iCur; //Current enum position CArray m_rects;//RECTS we enumerate public: CEnumRect(CArray & rects); virtual ~CEnumRect(); //IUnknown members STDMETHODIMP QueryInterface(REFIID, void **); STDMETHODIMP_(ULONG) AddRef(void); STDMETHODIMP_(ULONG) Release(void); //IEnumRECT members STDMETHODIMP Next(ULONG, LPRECT, ULONG *); STDMETHODIMP Skip(ULONG); STDMETHODIMP Reset(void); STDMETHODIMP Clone(LPENUMRECT *); }; //.....................................

15. Constructor/Destructor CEnumRect::CEnumRect(CArray & rects) { m_rects.Copy(rects); //Ref counts always start at zero m_cRef=0; //Current pointer is the first element m_iCur=0; } CEnumRect::~CEnumRect(void) { } CEnumRect::CEnumRect(CArray & rects) { m_rects.Copy(rects); //Ref counts always start at zero m_cRef=0; //Current pointer is the first element m_iCur=0; } CEnumRect::~CEnumRect(void) { }

16. CEnumRect::QueryInterface STDMETHODIMP CEnumRect::QueryInterface(REFIID riid, void** ppv) { //Always NULL the out-parameters *ppv=NULL; // No explicit typecast necessary since we singly derive // from IEnumRECT. if (IID_IUnknown==riid || IID_IEnumRECT==riid) *ppv= this; // == (LPUNKNOWN) this; if (NULL==*ppv) return ResultFromScode(E_NOINTERFACE); //AddRef any interface we'll return. ((LPUNKNOWN)*ppv)->AddRef(); return NOERROR; } STDMETHODIMP CEnumRect::QueryInterface(REFIID riid, void** ppv) { //Always NULL the out-parameters *ppv=NULL; // No explicit typecast necessary since we singly derive // from IEnumRECT. if (IID_IUnknown==riid || IID_IEnumRECT==riid) *ppv= this; // == (LPUNKNOWN) this; if (NULL==*ppv) return ResultFromScode(E_NOINTERFACE); //AddRef any interface we'll return. ((LPUNKNOWN)*ppv)->AddRef(); return NOERROR; }

17. CEnumRect::AddRef, Release STDMETHODIMP CEnumRect::AddRef(void) { return ++m_cRef; } STDMETHODIMP_(ULONG) CEnumRect::Release(void) { if (0 != --m_cRef) return m_cRef; delete this; return 0; } STDMETHODIMP CEnumRect::AddRef(void) { return ++m_cRef; } STDMETHODIMP_(ULONG) CEnumRect::Release(void) { if (0 != --m_cRef) return m_cRef; delete this; return 0; }

18. Exercise 1. Implementing objects with interfaces IEnumSentence and and IEnumWord for enumerating the sentences and words from a text file.

19. OLE Object Linking & Embedding Objects with Multiple Interfaces

20. Three Methods Interface Implementations Contained Interface Classes Multiple Inheritance

21. Example: Personal Account Personal Account IUnknown IBanking IPettyCash

22. IBanking and IPettyCash // Account.h #if !defined(IBanking_IPettyCash_HEARDER) #define IBanking_IPettyCash_HEARDER #include #undef INTERFACE #define INTERFACE IBanking DECLARE_INTERFACE_(IBanking, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IBanking methods STDMETHOD(Deposit)(THIS_ UINT) PURE; STDMETHOD(Withdraw)(THIS_ UINT) PURE; STDMETHOD(Balance)(THIS_ UINT *) PURE; }; // {8B5D2FC3-5633-423e-B846-4315F10F7C4A} DEFINE_GUID(IID_IBanking, 0x8b5d2fc3, 0x5633, 0x423e, 0xb8, 0x46, 0x43, 0x15, 0xf1, 0xf, 0x7c, 0x4a); typedef IBanking * LPBANKING; // Account.h #if !defined(IBanking_IPettyCash_HEARDER) #define IBanking_IPettyCash_HEARDER #include #undef INTERFACE #define INTERFACE IBanking DECLARE_INTERFACE_(IBanking, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IBanking methods STDMETHOD(Deposit)(THIS_ UINT) PURE; STDMETHOD(Withdraw)(THIS_ UINT) PURE; STDMETHOD(Balance)(THIS_ UINT *) PURE; }; // {8B5D2FC3-5633-423e-B846-4315F10F7C4A} DEFINE_GUID(IID_IBanking, 0x8b5d2fc3, 0x5633, 0x423e, 0xb8, 0x46, 0x43, 0x15, 0xf1, 0xf, 0x7c, 0x4a); typedef IBanking * LPBANKING;

23. IBanking and IPettyCash // Account.h #if !defined(IBanking_IPettyCash_HEARDER) #define IBanking_IPettyCash_HEARDER #include #undef INTERFACE #define INTERFACE IBanking DECLARE_INTERFACE_(IBanking, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IBanking methods STDMETHOD(Deposit)(THIS_ UINT) PURE; STDMETHOD(Withdraw)(THIS_ UINT) PURE; STDMETHOD(Balance)(THIS_ UINT *) PURE; }; // {8B5D2FC3-5633-423e-B846-4315F10F7C4A} DEFINE_GUID(IID_IBanking, 0x8b5d2fc3, 0x5633, 0x423e, 0xb8, 0x46, 0x43, 0x15, 0xf1, 0xf, 0x7c, 0x4a); typedef IBanking * LPBANKING; // Account.h #if !defined(IBanking_IPettyCash_HEARDER) #define IBanking_IPettyCash_HEARDER #include #undef INTERFACE #define INTERFACE IBanking DECLARE_INTERFACE_(IBanking, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IBanking methods STDMETHOD(Deposit)(THIS_ UINT) PURE; STDMETHOD(Withdraw)(THIS_ UINT) PURE; STDMETHOD(Balance)(THIS_ UINT *) PURE; }; // {8B5D2FC3-5633-423e-B846-4315F10F7C4A} DEFINE_GUID(IID_IBanking, 0x8b5d2fc3, 0x5633, 0x423e, 0xb8, 0x46, 0x43, 0x15, 0xf1, 0xf, 0x7c, 0x4a); typedef IBanking * LPBANKING; #undef INTERFACE #define INTERFACE IPettyCash DECLARE_INTERFACE_(IPettyCash, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IPettyCash methods STDMETHOD(Income)(THIS_ UINT) PURE; STDMETHOD(Pay)(THIS_ UINT) PURE; STDMETHOD(Cash)(THIS_ UINT *) PURE; }; // {7DCD4D1B-085E-40a7-93FE-4123E6F4C726} DEFINE_GUID(IID_IPettyCash, 0x7dcd4d1b, 0x85e, 0x40a7, 0x93, 0xfe, 0x41, 0x23, 0xe6, 0xf4, 0xc7, 0x26); typedef IPettyCash * LPPETTYCASH; #endif // !defined(IBanking_IPettyCash_HEARDER) #undef INTERFACE #define INTERFACE IPettyCash DECLARE_INTERFACE_(IPettyCash, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IPettyCash methods STDMETHOD(Income)(THIS_ UINT) PURE; STDMETHOD(Pay)(THIS_ UINT) PURE; STDMETHOD(Cash)(THIS_ UINT *) PURE; }; // {7DCD4D1B-085E-40a7-93FE-4123E6F4C726} DEFINE_GUID(IID_IPettyCash, 0x7dcd4d1b, 0x85e, 0x40a7, 0x93, 0xfe, 0x41, 0x23, 0xe6, 0xf4, 0xc7, 0x26); typedef IPettyCash * LPPETTYCASH; #endif // !defined(IBanking_IPettyCash_HEARDER)

24. Three Methods Interface Implementations Contained Interface Classes Multiple Inheritance

25. Exercise 2. Define interfaces for an object which manages personal data used in usual life, e.g., personal information and address book. You also need an interface (e.g., IPersistFile ) to access the information from a file. 3. Implement the personal-data object including the interfaces you defined using the three methods described in this lecture. 4. Write an MFC application using the personal- data object.

26. OLE Object Linking & Embedding Server Modules of COM

27. The Generic Structure of a Server Module Object Object interfaces (as many as desired) Class factory: Creates objects Registration Sever module IClassFactory(2) Exposure for Class factory Unloading mechanism Implementation differs between DLL and EXE servers. Implementation can be independent of execution context.

28. Registry Entries In-process servers: InprocServer32= Object handlers: InprocHandler32= Local servers: LocalServer32=

29. Self-Registration DLL Servers – DllRegisterServer – DllUnregisterServer EXE servers  Command arguments – /RegServer – /UnregServer

30. Server Emulation \ CLSID {42754580-16b7-11ce-80eb-00aa003d7352} = Original Component TreatAs = {6fa820f0-2e48-11ce-80eb-00aa003d7352} AutoTreatAs = {6fa820f0-2e48-11ce-80eb-00aa003d7352} InprocServer32 = c:\older\original.dll {6fa820f0-2e48-11ce-80eb-00aa003d7352} = New Emulating Component InprocServer32 = c:\newer\emulator.dll

31. Some API’s CoGetClassObject CoCreateInstance(Ex) CoGetTreatAsClass CoTreatAsClass

32. Exercises 5. Read the APIs for server emulations. 6. Lookup system registry to find some entries with TreatAs and AutoTreatAs keys.

33. OLE Object Linking & Embedding Class Factory & IClassFactory

34. Server Class factory (an object) The Class-Factory Object Object  Factory returns New interface Pointer to client  IClassFactory- ::CreateInstance  Factory manufactures object. Client

35. IClassFactory interface IClassFactory : IUnknown { HRESULT CreateInstance(IUnknown *pUnkOuter, REFIID riid, void **ppv); HRESULT LockServer(BOOL fLock); }; interface IClassFactory : IUnknown { HRESULT CreateInstance(IUnknown *pUnkOuter, REFIID riid, void **ppv); HRESULT LockServer(BOOL fLock); };

36. Licensing with IClassFactory2 interface IClassFactory2 : IClassFactory { HRESULT GetLicInfo(LPLICINFO pLicInfo); HRESULT RequestLicKey(DWORD dwResrved, BSTR FAR* pbstrKey); HRESULT CreateInstanceLic(IUnknown *pUnkOuter, IUnknown *pUnkReserved, REFIID riid, BSTR bstrKey, void **ppvObject); }; interface IClassFactory2 : IClassFactory { HRESULT GetLicInfo(LPLICINFO pLicInfo); HRESULT RequestLicKey(DWORD dwResrved, BSTR FAR* pbstrKey); HRESULT CreateInstanceLic(IUnknown *pUnkOuter, IUnknown *pUnkReserved, REFIID riid, BSTR bstrKey, void **ppvObject); };

37. Exposing the Class Factory  In-Process Server Implement DllGetClassObject Implement DllCanUnloadNow STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void **ppv); STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void **ppv); STDAPI DllCanUnloadNow(void);

38. Exposing the Class Factory  Local Server CoRegisterClassObject CoRevokeClassObject HRESULT CoRevokeClassObject(DWORD dwRegister); STDAPI CoRegisterClassObject( REFCLSID rclsid, IUnknown * pUnk, DWORD dwClsContext, DWORD flags, LPDWORD lpdwRegister ); STDAPI CoRegisterClassObject( REFCLSID rclsid, IUnknown * pUnk, DWORD dwClsContext, DWORD flags, LPDWORD lpdwRegister );

39. In-Process-Server Creation          

40. Local-Server Creation         

41. Create Multiple COM Objects Step1. Get IClassFactory by Step2. Call IClassFactory::CreateInstance(…) a number of time if multiple objects are needed Step3. Call IClassFactory::Release(). STDAPI CoGetClassObject( REFCLSID rclsid, //CLSID associated with the class object DWORD dwClsContext, //Context for running executable code COSERVERINFO * pServerInfo, //Pointer to machine on which the object is to // be instantiated REFIID riid, //Reference to the identifier of the interface LPVOID * ppv //Address of output variable that receives the // interface pointer requested in riid ); STDAPI CoGetClassObject( REFCLSID rclsid, //CLSID associated with the class object DWORD dwClsContext, //Context for running executable code COSERVERINFO * pServerInfo, //Pointer to machine on which the object is to // be instantiated REFIID riid, //Reference to the identifier of the interface LPVOID * ppv //Address of output variable that receives the // interface pointer requested in riid );

42. Create Single COM Objects STDAPI CoCreateInstance( REFCLSID rclsid, //Class identifier (CLSID) of the object LPUNKNOWN pUnkOuter, //Pointer to controlling IUnknown DWORD dwClsContext, //Context for running executable code REFIID riid, //Reference to the identifier of the interface LPVOID * ppv //Address of output variable that receives // the interface pointer requested in riid ); STDAPI CoCreateInstance( REFCLSID rclsid, //Class identifier (CLSID) of the object LPUNKNOWN pUnkOuter, //Pointer to controlling IUnknown DWORD dwClsContext, //Context for running executable code REFIID riid, //Reference to the identifier of the interface LPVOID * ppv //Address of output variable that receives // the interface pointer requested in riid );

43. CoGetClassObject() vs. CoCreateInstance() STDAPI CoCreateInstance(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwContext, REFIID iid, void **ppv) { HRESULT hr; IClassFactory *pCF; *ppv=NULL; hr=CoGetClassObject(rclsid, dwContext, NULL, IID_IClassFactory, (void **) &pCF); if (FAILED(hr)) return hr; hr=pCF->CreateInstance(pUnkOuter, iid, ppv); pCF->Release(); return hr; } STDAPI CoCreateInstance(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwContext, REFIID iid, void **ppv) { HRESULT hr; IClassFactory *pCF; *ppv=NULL; hr=CoGetClassObject(rclsid, dwContext, NULL, IID_IClassFactory, (void **) &pCF); if (FAILED(hr)) return hr; hr=pCF->CreateInstance(pUnkOuter, iid, ppv); pCF->Release(); return hr; }

44. OLE Object Linking & Embedding Example  Simple Object

45. Example: Simple Object  In-Process Sever

46. Exercises 7. The above example create COM object using CoCreateInstance(). Modify it by using class factory. 8. Modify the server of the above example so that it can create multiple classes of COM object. 9. Code the problem in Exercise 3 as an in-process server, and write an MFC application to use the object.

47. OLE Object Linking & Embedding Self-Registration

48. Some Registry Functions RegCreateKey(Ex) RegSetValue(Ex) RegCloseKey RegOpenKey(Ex) RegEnumKey(Ex) RegEnumValue RegQueryInfoKey RegDeleteKey

49. RegSvr32.EXE

50. DEF File ;DSimpleObject.def : 聲明動態庫 DLL 的模組參數. LIBRARY DSimpleObject DESCRIPTION ' 我的第一個純 C++ COM 對象 ' EXPORTS DllRegisterServerPRIVATE ; COM server registration DllUnregisterServerPRIVATE ; COM server deregistration DllCanUnloadNowPRIVATE DllGetClassObjectPRIVATE ;DSimpleObject.def : 聲明動態庫 DLL 的模組參數. LIBRARY DSimpleObject DESCRIPTION ' 我的第一個純 C++ COM 對象 ' EXPORTS DllRegisterServerPRIVATE ; COM server registration DllUnregisterServerPRIVATE ; COM server deregistration DllCanUnloadNowPRIVATE DllGetClassObjectPRIVATE

51. OLE Object Linking & Embedding InProcess Severs by MFC

52. Example: CalculatorMemory

53. IMemoey DECLARE_INTERFACE_(IMemory, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IMemory methods STDMETHOD(MemoryClear)(THIS) PURE; STDMETHOD(MemoryRecall)(THIS_ double *) PURE; STDMETHOD(MemoryPlus)(THIS_ double) PURE; STDMETHOD(MemoryMinus)(THIS_ double) PURE; }; DECLARE_INTERFACE_(IMemory, IUnknown) { // IUnknown methods STDMETHOD(QueryInterface)(THIS_ REFIID, void **) PURE; STDMETHOD_(ULONG, AddRef)(THIS) PURE; STDMETHOD_(ULONG, Release)(THIS) PURE; // IMemory methods STDMETHOD(MemoryClear)(THIS) PURE; STDMETHOD(MemoryRecall)(THIS_ double *) PURE; STDMETHOD(MemoryPlus)(THIS_ double) PURE; STDMETHOD(MemoryMinus)(THIS_ double) PURE; };

54. Create MFC Project

57. Create COM Objects

58. CalculatorMemory.h class CCalculatorMemory : public CCmdTarget {......................................... // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCalculatorMemory) public: virtual void OnFinalRelease(); //}}AFX_VIRTUAL // Implementation protected:......................................... DECLARE_OLECREATE(CCalculatorMemory) // Generated OLE dispatch map functions //{{AFX_DISPATCH(CCalculatorMemory) // NOTE - the ClassWizard will add and remove member functions here. //}}AFX_DISPATCH DECLARE_DISPATCH_MAP() DECLARE_INTERFACE_MAP() }; class CCalculatorMemory : public CCmdTarget {......................................... // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCalculatorMemory) public: virtual void OnFinalRelease(); //}}AFX_VIRTUAL // Implementation protected:......................................... DECLARE_OLECREATE(CCalculatorMemory) // Generated OLE dispatch map functions //{{AFX_DISPATCH(CCalculatorMemory) // NOTE - the ClassWizard will add and remove member functions here. //}}AFX_DISPATCH DECLARE_DISPATCH_MAP() DECLARE_INTERFACE_MAP() };

59. CalculatorMemory.h class CCalculatorMemory : public CCmdTarget {......................................... // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCalculatorMemory) public: virtual void OnFinalRelease(); //}}AFX_VIRTUAL // Implementation protected:......................................... DECLARE_OLECREATE(CCalculatorMemory) // Generated OLE dispatch map functions //{{AFX_DISPATCH(CCalculatorMemory) // NOTE - the ClassWizard will add and remove member functions here. //}}AFX_DISPATCH DECLARE_DISPATCH_MAP() DECLARE_INTERFACE_MAP() }; class CCalculatorMemory : public CCmdTarget {......................................... // Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CCalculatorMemory) public: virtual void OnFinalRelease(); //}}AFX_VIRTUAL // Implementation protected:......................................... DECLARE_OLECREATE(CCalculatorMemory) // Generated OLE dispatch map functions //{{AFX_DISPATCH(CCalculatorMemory) // NOTE - the ClassWizard will add and remove member functions here. //}}AFX_DISPATCH DECLARE_DISPATCH_MAP() DECLARE_INTERFACE_MAP() };

60. CalculatorMemory.Cpp........................................................................... BEGIN_DISPATCH_MAP(CCalculatorMemory, CCmdTarget) //{{AFX_DISPATCH_MAP(CCalculatorMemory) // NOTE - the ClassWizard will add and remove mapping macros here. //}}AFX_DISPATCH_MAP END_DISPATCH_MAP() // Note: we add support for IID_ICalculatorMemory to support typesafe binding // from VBA. This IID must match the GUID that is attached to the // dispinterface in the.ODL file. // {07B9A7FE-DAD0-4865-9E96-43794803D4E7} static const IID IID_ICalculatorMemory = { 0x7b9a7fe, 0xdad0, 0x4865, { 0x9e, 0x96, 0x43, 0x79, 0x48, 0x3, 0xd4, 0xe7 } }; BEGIN_INTERFACE_MAP(CCalculatorMemory, CCmdTarget) INTERFACE_PART(CCalculatorMemory, IID_ICalculatorMemory, Dispatch) END_INTERFACE_MAP() // {E928B5CD-8700-48B3-9D74-21E7C76F4B35} IMPLEMENT_OLECREATE(CCalculatorMemory, "CalculatorMemory",..........)...................................................................................................................................................... BEGIN_DISPATCH_MAP(CCalculatorMemory, CCmdTarget) //{{AFX_DISPATCH_MAP(CCalculatorMemory) // NOTE - the ClassWizard will add and remove mapping macros here. //}}AFX_DISPATCH_MAP END_DISPATCH_MAP() // Note: we add support for IID_ICalculatorMemory to support typesafe binding // from VBA. This IID must match the GUID that is attached to the // dispinterface in the.ODL file. // {07B9A7FE-DAD0-4865-9E96-43794803D4E7} static const IID IID_ICalculatorMemory = { 0x7b9a7fe, 0xdad0, 0x4865, { 0x9e, 0x96, 0x43, 0x79, 0x48, 0x3, 0xd4, 0xe7 } }; BEGIN_INTERFACE_MAP(CCalculatorMemory, CCmdTarget) INTERFACE_PART(CCalculatorMemory, IID_ICalculatorMemory, Dispatch) END_INTERFACE_MAP() // {E928B5CD-8700-48B3-9D74-21E7C76F4B35} IMPLEMENT_OLECREATE(CCalculatorMemory, "CalculatorMemory",..........)...........................................................................

61. CalculatorMemory.Cpp........................................................................... BEGIN_DISPATCH_MAP(CCalculatorMemory, CCmdTarget) //{{AFX_DISPATCH_MAP(CCalculatorMemory) // NOTE - the ClassWizard will add and remove mapping macros here. //}}AFX_DISPATCH_MAP END_DISPATCH_MAP() // Note: we add support for IID_ICalculatorMemory to support typesafe binding // from VBA. This IID must match the GUID that is attached to the // dispinterface in the.ODL file. // {07B9A7FE-DAD0-4865-9E96-43794803D4E7} static const IID IID_ICalculatorMemory = { 0x7b9a7fe, 0xdad0, 0x4865, { 0x9e, 0x96, 0x43, 0x79, 0x48, 0x3, 0xd4, 0xe7 } }; BEGIN_INTERFACE_MAP(CCalculatorMemory, CCmdTarget) INTERFACE_PART(CCalculatorMemory, IID_ICalculatorMemory, Dispatch) END_INTERFACE_MAP() // {E928B5CD-8700-48B3-9D74-21E7C76F4B35} IMPLEMENT_OLECREATE(CCalculatorMemory, "CalculatorMemory",..........)........................................................................... BEGIN_DISPATCH_MAP(CCalculatorMemory, CCmdTarget) //{{AFX_DISPATCH_MAP(CCalculatorMemory) // NOTE - the ClassWizard will add and remove mapping macros here. //}}AFX_DISPATCH_MAP END_DISPATCH_MAP() // Note: we add support for IID_ICalculatorMemory to support typesafe binding // from VBA. This IID must match the GUID that is attached to the // dispinterface in the.ODL file. // {07B9A7FE-DAD0-4865-9E96-43794803D4E7} static const IID IID_ICalculatorMemory = { 0x7b9a7fe, 0xdad0, 0x4865, { 0x9e, 0x96, 0x43, 0x79, 0x48, 0x3, 0xd4, 0xe7 } }; BEGIN_INTERFACE_MAP(CCalculatorMemory, CCmdTarget) INTERFACE_PART(CCalculatorMemory, IID_ICalculatorMemory, Dispatch) END_INTERFACE_MAP() // {E928B5CD-8700-48B3-9D74-21E7C76F4B35} IMPLEMENT_OLECREATE(CCalculatorMemory, "CalculatorMemory",..........)...........................................................................

62. Example: CalculatorMemory View Source Code

63. Exercises 10. Implement a simple calculator COM Sever by MFC. 11. Understanding what it is IDispatch. 12. Understanding string data type BSTR. 13. Understanding VARIANT data structure and its usages.