基于对话框程序中让对话框捕获WM_KEYDOWN消息的实现方法

class CWinSunApp : public CWinApp

{

public:

       HWND m_hwndDlg;

       CWinSunApp();

// Overrides

       // ClassWizard generated virtual function overrides

       //{{AFX_VIRTUAL(CWinSunApp)

       public:

       virtual BOOL InitInstance();

       //}}AFX_VIRTUAL

// Implementation

       //{{AFX_MSG(CWinSunApp)

              // NOTE - the ClassWizard will add and remove member functions here.

              //    DO NOT EDIT what you see in these blocks of generated code !

       //}}AFX_MSG

       DECLARE_MESSAGE_MAP()

};

BOOL CWinSunApp::InitInstance()

{

       AfxEnableControlContainer();

       // Standard initialization

       // If you are not using these features and wish to reduce the size

       //  of your final executable, you should remove from the following

       //  the specific initialization routines you do not need.

#ifdef _AFXDLL

       Enable3dControls();                     // Call this when using MFC in a shared DLL

#else

       Enable3dControlsStatic();      // Call this when linking to MFC statically

#endif

       CWinSunDlg dlg;

       m_pMainWnd = &dlg;

       int nResponse = dlg.DoModal();

       if (nResponse == IDOK)

       {

              // TODO: Place code here to handle when the dialog is

              //  dismissed with OK

       }

       else if (nResponse == IDCANCEL)

       {

              // TODO: Place code here to handle when the dialog is

              //  dismissed with Cancel

       }

       // Since the dialog has been closed, return FALSE so that we exit the

       //  application, rather than start the application's message pump.

       m_hwndDlg=NULL;

       return FALSE;

}

BOOL CWinSunApp::ProcessMessageFilter(int code, LPMSG lpMsg)

{

       // TODO: Add your specialized code here and/or call the base class

       if(m_hwndDlg!=NULL)

       {

              //判断消息，如果消息是从对话框发出的或者其子控件发出的，我们就进行处理。sunxin

              if((lpMsg->hwnd==m_hwndDlg) || ::IsChild(m_hwndDlg,lpMsg->hwnd))

              {

                     //如果消息是WM_KEYDOWN，我们就弹出一个消息框。sunxin

                     if(lpMsg->message==WM_KEYDOWN)

                     {

                            AfxMessageBox("捕获WM_KEYDOWN消息成功！");

                     }

              }

       }

       return CWinApp::ProcessMessageFilter(code, lpMsg);

}

BOOL CWinSunDlg::OnInitDialog()

{

       CDialog::OnInitDialog();

       // Add "About..." menu item to system menu.

       // IDM_ABOUTBOX must be in the system command range.

       ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);

       ASSERT(IDM_ABOUTBOX < 0xF000);

       CMenu* pSysMenu = GetSystemMenu(FALSE);

       if (pSysMenu != NULL)

       {

              CString strAboutMenu;

              strAboutMenu.LoadString(IDS_ABOUTBOX);

              if (!strAboutMenu.IsEmpty())

              {

                     pSysMenu->AppendMenu(MF_SEPARATOR);

                     pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);

              }

       }

       // Set the icon for this dialog.  The framework does this automatically

       //  when the application's main window is not a dialog

       SetIcon(m_hIcon, TRUE);                  // Set big icon

       SetIcon(m_hIcon, FALSE);          // Set small icon

       // TODO: Add extra initialization here

//将对话框的句柄传递到CWinSunApp类中。sunxin

       ((CWinSunApp*)AfxGetApp())->m_hwndDlg=m_hWnd;

       return TRUE;  // return TRUE  unless you set the focus to a control

}

void CWinSunDlg::OnDestroy()

{

       CDialog::OnDestroy();

       // TODO: Add your message handler code here

       ((CWinSunApp*)AfxGetApp())->m_hwndDlg=NULL;

}