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实验环境： vs2010 + WTL8.1 + dialog

实验目的：为了发生特定系统消息时，做一些额外的处理。

  e.g.

  * ALT+F4关闭程序

  * 点击任务栏上的程序图标，恢复程序

// MainDlg.h : interface of the CMainDlg class///#pragma onceclass CMainDlg : public CDialogImpl
   
    , public CUpdateUI
    
     ,		public CMessageFilter, public CIdleHandler{public:	enum { IDD = IDD_MAINDLG };	virtual BOOL PreTranslateMessage(MSG* pMsg);	virtual BOOL OnIdle();	BEGIN_UPDATE_UI_MAP(CMainDlg)	END_UPDATE_UI_MAP()	BEGIN_MSG_MAP(CMainDlg)		MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)		MESSAGE_HANDLER(WM_DESTROY, OnDestroy)		COMMAND_ID_HANDLER(ID_APP_ABOUT, OnAppAbout)		COMMAND_ID_HANDLER(IDOK, OnOK)		COMMAND_ID_HANDLER(IDCANCEL, OnCancel)		MESSAGE_HANDLER(WM_SYSCOMMAND, OnSysCommand)	END_MSG_MAP()// Handler prototypes (uncomment arguments if needed)://	LRESULT MessageHandler(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)//	LRESULT CommandHandler(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)//	LRESULT NotifyHandler(int /*idCtrl*/, LPNMHDR /*pnmh*/, BOOL& /*bHandled*/)	LRESULT OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);	LRESULT OnDestroy(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);	LRESULT OnAppAbout(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/);	LRESULT OnOK(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/);	LRESULT OnCancel(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/);	LRESULT OnSysCommand(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);	void CloseDialog(int nVal);};
    
   

LRESULT CMainDlg::OnSysCommand(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL & bHandled){	if (WM_SYSCOMMAND != uMsg)		return -1;		OutputDebugStringW(L">> CMainDlg::OnSysCommand\r\n");	switch (wParam)	{		/// when maindlg show normal, click the minimize dialog on task tar, entry here	case SC_MINIMIZE: ///< the minimize button of main dialog press down		OutputDebugStringW(L"SC_MINIMIZE\r\n");		break;		/// ALT + F4 key press down	case SC_CLOSE: ///< the close button of main dialog press down		OutputDebugStringW(L"SC_CLOSE\r\n");		break;	case SC_RESTORE: ///< when maindlg minimized, click the minimize dialog on task tar, entry here		/// if need, refresh main dialog when display resolution changed		OutputDebugStringW(L"SC_RESTORE\r\n");		break;	default:		break;	}	bHandled = FALSE; ///< if set bHandled to TRUE, the message process invalid	OutputDebugStringW(L"<< CMainDlg::OnSysCommand\r\n");	return 0;}

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