MFC CWinThread Class成员变量及成员函数

一、概要

       CWinThread类封装了对线程的操作，一个CWinThread对象代表在应用程序中一个线程的执行。在MFC应用程序中，主执行线程是CWinThread派生类CWinApp的派生类对象。由CWinApp类派生的新类都是用户界面线程。

二、类图位置

        

三、多线程的实现方法

四、CWinThread头文件

class CWinThread : public CCmdTarget{DECLARE_DYNAMIC(CWinThread)friend BOOL AfxInternalPreTranslateMessage(MSG* pMsg);public:// ConstructorsCWinThread();/// 开始一个CWinThread对象的执行BOOL CreateThread(DWORD dwCreateFlags = 0, UINT nStackSize = 0,LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL);///常用的启动线程的方法///※① CreateThread()///※② _beginThread　_beginThreadEx()///※③ AfxBeginThread() MFC全局函数// Attributes///保存指向应用程序的主窗口的指针CWnd* m_pMainWnd;       // main window (usually same AfxGetApp()->m_pMainWnd)///指向容器应用程序的主窗口，当一个OLE服务器被现场激活时  CWnd* m_pActiveWnd;     // active main window (may not be m_pMainWnd)///指定线程结束时是否要销毁对象 BOOL m_bAutoDelete;     // enables 'delete this' after thread termination// only valid while running////当前线程的句柄HANDLE m_hThread;       // this thread's HANDLEoperator HANDLE() const;/// 当前线程的ID  DWORD m_nThreadID;      // this thread's ID///  获取当前线程的优先级  int GetThreadPriority();/// 设置当前线程的优先级  BOOL SetThreadPriority(int nPriority);// Operations/// 增加一个线程的挂起计数/// 当线程的挂起计数大于0时，该线程将暂停执行，称之为挂起状态。DWORD SuspendThread();///减少一个线程的挂起计数/// 当线程的挂起计数减少到0时，恢复线程的执行。DWORD ResumeThread();/// 向另外的CWinThread对象传递一条消息  BOOL PostThreadMessage(UINT message, WPARAM wParam, LPARAM lParam);// Overridables// thread initialization///重载以实现线程实例的初始化virtual BOOL InitInstance();// running and idle processing///线程的具有消息收发功能的控制函数，可重载以定制缺省的消息循环virtual int Run();///在消息被发送到Windows函数TranslateMessage和DispatchMessage之前过滤消息virtual BOOL PreTranslateMessage(MSG* pMsg);virtual BOOL PumpMessage(); // low level message pump///重载以进行线程特定的空闲操作virtual BOOL OnIdle(LONG lCount); // return TRUE if more idle processing///检测特定的消息 virtual BOOL IsIdleMessage(MSG* pMsg);  // checks for special messages// thread termination/// 重载以进行线程终止时的清理工作virtual int ExitInstance(); // default will 'delete this'// Advanced: exception handling///截获线程消息和命令处理函数出现的所有未处理的异常  virtual LRESULT ProcessWndProcException(CException* e, const MSG* pMsg);// Advanced: handling messages sent to message filter hook///在特定的消息到达应用程序之前截获消息virtual BOOL ProcessMessageFilter(int code, LPMSG lpMsg);// Advanced: virtual access to m_pMainWnd//// 查询指向线程主窗口的指针virtual CWnd* GetMainWnd();// Implementationpublic:virtual ~CWinThread();#ifdef _DEBUGvirtual void AssertValid() const;virtual void Dump(CDumpContext& dc) const;#endifvoid CommonConstruct();virtual void Delete();// 'delete this' only if m_bAutoDelete == TRUEpublic:// constructor used by implementation of AfxBeginThreadCWinThread(AFX_THREADPROC pfnThreadProc, LPVOID pParam);// valid after constructionLPVOID m_pThreadParams; // generic parameters passed to starting functionAFX_THREADPROC m_pfnThreadProc;// set after OLE is initializedvoid (AFXAPI* m_lpfnOleTermOrFreeLib)(BOOL, BOOL);COleMessageFilter* m_pMessageFilter;protected:BOOL DispatchThreadMessageEx(MSG* msg);  // helpervoid DispatchThreadMessage(MSG* msg);  // obsolete};