下载本文示例代码
文档模板管理者类CDocManager 在"文档/视图"架构的MFC程序中，提供了文档模板管理者类CDocManager，由它管理应用程序所包含的文档模板。我们先看看这个类的声明：
/////////////////////////////////////////////////////////////////////////////// CDocTemplate manager object class CDocManager : public CObject{ DECLARE_DYNAMIC(CDocManager) public: // Constructor CDocManager(); //Document functions virtual void AddDocTemplate(CDocTemplate* pTemplate); virtual POSITION GetFirstDocTemplatePosition() const; virtual CDocTemplate* GetNextDocTemplate(POSITION& pos) const; virtual void RegisterShellFileTypes(BOOL bCompat); void UnregisterShellFileTypes(); virtual CDocument* OpenDocumentFile(LPCTSTR lpszFileName); // open named file virtual BOOL SaveAllModified(); // save before exit virtual void CloseAllDocuments(BOOL bEndSession); // close documents before exiting virtual int GetOpenDocumentCount(); // helper for standard commdlg dialogs virtual BOOL DoPromptFileName(CString& fileName, UINT nIDSTitle, DWORD lFlags, BOOL bOpenFileDialog, CDocTemplate* pTemplate); //Commands // Advanced: process async DDE request virtual BOOL OnDDECommand(LPTSTR lpszCommand); virtual void OnFileNew(); virtual void OnFileOpen(); // Implementation protected: CPtrList m_templateList; int GetDocumentCount(); // helper to count number of total documents public: static CPtrList* pStaticList; // for static CDocTemplate objects static BOOL bStaticInit; // TRUE during static initialization static CDocManager* pStaticDocManager; // for static CDocTemplate objects public: virtual ~CDocManager(); #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif}; 从上述代码可以看出，CDocManager类维护一个CPtrList类型的链表m_templateList（即文档模板链表，实际上，MFC的设计者在MFC的实现中大量使用了链表这种数据结构），CPtrList类型定义为：
class CPtrList : public CObject{ DECLARE_DYNAMIC(CPtrList) protected: struct CNode { CNode* pNext; CNode* pPrev; void* data; }; public: // Construction CPtrList(int nBlockSize = 10); // Attributes (head and tail) // count of elements int GetCount() const; BOOL IsEmpty() const; // peek at head or tail void*& GetHead(); void* GetHead() const; void*& GetTail(); void* GetTail() const; // Operations // get head or tail (and remove it) - don't call on empty list! void* RemoveHead(); void* RemoveTail(); // add before head or after tail POSITION AddHead(void* newElement); POSITION AddTail(void* newElement); // add another list of elements before head or after tail void AddHead(CPtrList* pNewList); void AddTail(CPtrList* pNewList); // remove all elements void RemoveAll(); // iteration POSITION GetHeadPosition() const; POSITION GetTailPosition() const; void*& GetNext(POSITION& rPosition); // return *Position void* GetNext(POSITION& rPosition) const; // return *Position void*& GetPrev(POSITION& rPosition); // return *Position-- void* GetPrev(POSITION& rPosition) const; // return *Position-- // getting/modifying an element at a given position void*& GetAt(POSITION position); void* GetAt(POSITION position) const; void SetAt(POSITION pos, void* newElement); void RemoveAt(POSITION position); // inserting before or after a given position POSITION InsertBefore(POSITION position, void* newElement); POSITION InsertAfter(POSITION position, void* newElement); // helper functions (note: O(n) speed) POSITION Find(void* searchValue, POSITION startAfter = NULL) const; // defaults to starting at the HEAD // return NULL if not found POSITION FindIndex(int nIndex) const; // get the 'nIndex'th element (may return NULL) // Implementation protected: CNode* m_pNodeHead; CNode* m_pNodeTail; int m_nCount; CNode* m_pNodeFree; struct CPlex* m_pBlocks; int m_nBlockSize; CNode* NewNode(CNode*, CNode*); void FreeNode(CNode*); public: ~CPtrList(); #ifdef _DEBUG void Dump(CDumpContext&) const; void AssertValid() const; #endif // local typedefs for class templates typedef void* BASE_TYPE; typedef void* BASE_ARG_TYPE;};很显然，CPtrList是对链表结构体struct CNode{ CNode* pNext; CNode* pPrev; void* data;}; 本身及其GetNext、GetPrev、GetAt、SetAt、RemoveAt、InsertBefore、InsertAfter、Find、FindIndex等各种操作的封装。 作为一个抽象的链表类型，CPtrList并未定义其中节点的具体类型，而以一个void指针（struct CNode 中的void* data）巧妙地实现了链表节点成员具体类型的"模板"化。很显然，在Visual C 6.0开发的年代，C 语言所具有的语法特征"模板"仍然没有得到广泛的应用。而CDocManager类的成员函数
virtual void AddDocTemplate(CDocTemplate* pTemplate);virtual POSITION GetFirstDocTemplatePosition() const;virtual CDocTemplate* GetNextDocTemplate(POSITION& pos) const; 则完成对m_TemplateList链表的添加及遍历操作的封装，我们来看看这三个函数的源代码：
void CDocManager::AddDocTemplate(CDocTemplate* pTemplate){ if (pTemplate == NULL) { if (pStaticList != NULL) { POSITION pos = pStaticList->GetHeadPosition(); while (pos != NULL) { CDocTemplate* pTemplate = (CDocTemplate*)pStaticList->GetNext(pos); AddDocTemplate(pTemplate); } delete pStaticList; pStaticList = NULL; } bStaticInit = FALSE; } else { ASSERT_VALID(pTemplate); ASSERT(m_templateList.Find(pTemplate, NULL) == NULL);// must not be in list pTemplate->LoadTemplate(); m_templateList.AddTail(pTemplate); }}POSITION CDocManager::GetFirstDocTemplatePosition() const{ return m_templateList.GetHeadPosition();}CDocTemplate* CDocManager::GetNextDocTemplate(POSITION& pos) const{ return (CDocTemplate*)m_templateList.GetNext(pos);}共4页。 1 2 3 4 :
文档模板管理者类CDocManager 在"文档/视图"架构的MFC程序中，提供了文档模板管理者类CDocManager，由它管理应用程序所包含的文档模板。我们先看看这个类的声明：
/////////////////////////////////////////////////////////////////////////////// CDocTemplate manager object class CDocManager : public CObject{ DECLARE_DYNAMIC(CDocManager) public: // Constructor CDocManager(); //Document functions virtual void AddDocTemplate(CDocTemplate* pTemplate); virtual POSITION GetFirstDocTemplatePosition() const; virtual CDocTemplate* GetNextDocTemplate(POSITION& pos) const; virtual void RegisterShellFileTypes(BOOL bCompat); void UnregisterShellFileTypes(); virtual CDocument* OpenDocumentFile(LPCTSTR lpszFileName); // open named file virtual BOOL SaveAllModified(); // save before exit virtual void CloseAllDocuments(BOOL bEndSession); // close documents before exiting virtual int GetOpenDocumentCount(); // helper for standard commdlg dialogs virtual BOOL DoPromptFileName(CString& fileName, UINT nIDSTitle, DWORD lFlags, BOOL bOpenFileDialog, CDocTemplate* pTemplate); //Commands // Advanced: process async DDE request virtual BOOL OnDDECommand(LPTSTR lpszCommand); virtual void OnFileNew(); virtual void OnFileOpen(); // Implementation protected: CPtrList m_templateList; int GetDocumentCount(); // helper to count number of total documents public: static CPtrList* pStaticList; // for static CDocTemplate objects static BOOL bStaticInit; // TRUE during static initialization static CDocManager* pStaticDocManager; // for static CDocTemplate objects public: virtual ~CDocManager(); #ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const; #endif}; 从上述代码可以看出，CDocManager类维护一个CPtrList类型的链表m_templateList（即文档模板链表，实际上，MFC的设计者在MFC的实现中大量使用了链表这种数据结构），CPtrList类型定义为：
class CPtrList : public CObject{ DECLARE_DYNAMIC(CPtrList) protected: struct CNode { CNode* pNext; CNode* pPrev; void* data; }; public: // Construction CPtrList(int nBlockSize = 10); // Attributes (head and tail) // count of elements int GetCount() const; BOOL IsEmpty() const; // peek at head or tail void*& GetHead(); void* GetHead() const; void*& GetTail(); void* GetTail() const; // Operations // get head or tail (and remove it) - don't call on empty list! void* RemoveHead(); void* RemoveTail(); // add before head or after tail POSITION AddHead(void* newElement); POSITION AddTail(void* newElement); // add another list of elements before head or after tail void AddHead(CPtrList* pNewList); void AddTail(CPtrList* pNewList); // remove all elements void RemoveAll(); // iteration POSITION GetHeadPosition() const; POSITION GetTailPosition() const; void*& GetNext(POSITION& rPosition); // return *Position void* GetNext(POSITION& rPosition) const; // return *Position void*& GetPrev(POSITION& rPosition); // return *Position-- void* GetPrev(POSITION& rPosition) const; // return *Position-- // getting/modifying an element at a given position void*& GetAt(POSITION position); void* GetAt(POSITION position) const; void SetAt(POSITION pos, void* newElement); void RemoveAt(POSITION position); // inserting before or after a given position POSITION InsertBefore(POSITION position, void* newElement); POSITION InsertAfter(POSITION position, void* newElement); // helper functions (note: O(n) speed) POSITION Find(void* searchValue, POSITION startAfter = NULL) const; // defaults to starting at the HEAD // return NULL if not found POSITION FindIndex(int nIndex) const; // get the 'nIndex'th element (may return NULL) // Implementation protected: CNode* m_pNodeHead; CNode* m_pNodeTail; int m_nCount; CNode* m_pNodeFree; struct CPlex* m_pBlocks; int m_nBlockSize; CNode* NewNode(CNode*, CNode*); void FreeNode(CNode*); public: ~CPtrList(); #ifdef _DEBUG void Dump(CDumpContext&) const; void AssertValid() const; #endif // local typedefs for class templates typedef void* BASE_TYPE; typedef void* BASE_ARG_TYPE;};很显然，CPtrList是对链表结构体struct CNode{ CNode* pNext; CNode* pPrev; void* data;}; 本身及其GetNext、GetPrev、GetAt、SetAt、RemoveAt、InsertBefore、InsertAfter、Find、FindIndex等各种操作的封装。 作为一个抽象的链表类型，CPtrList并未定义其中节点的具体类型，而以一个void指针（struct CNode 中的void* data）巧妙地实现了链表节点成员具体类型的"模板"化。很显然，在Visual C 6.0开发的年代，C 语言所具有的语法特征"模板"仍然没有得到广泛的应用。而CDocManager类的成员函数
virtual void AddDocTemplate(CDocTemplate* pTemplate);virtual POSITION GetFirstDocTemplatePosition() const;virtual CDocTemplate* GetNextDocTemplate(POSITION& pos) const; 则完成对m_TemplateList链表的添加及遍历操作的封装，我们来看看这三个函数的源代码：
void CDocManager::AddDocTemplate(CDocTemplate* pTemplate){ if (pTemplate == NULL) { if (pStaticList != NULL) { POSITION pos = pStaticList->GetHeadPosition(); while (pos != NULL) { CDocTemplate* pTemplate = (CDocTemplate*)pStaticList->GetNext(pos); AddDocTemplate(pTemplate); } delete pStaticList; pStaticList = NULL; } bStaticInit = FALSE; } else { ASSERT_VALID(pTemplate); ASSERT(m_templateList.Find(pTemplate, NULL) == NULL);// must not be in list pTemplate->LoadTemplate(); m_templateList.AddTail(pTemplate); }}POSITION CDocManager::GetFirstDocTemplatePosition() const{ return m_templateList.GetHeadPosition();}CDocTemplate* CDocManager::GetNextDocTemplate(POSITION& pos) const{ return (CDocTemplate*)m_templateList.GetNext(pos);}共4页。 1 2 3 4 :
下载本文示例代码
深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板深入浅出MFC文档/视图架构之文档模板
