DoDataExchange_总结

记两种方便的:

1. ATL_Subclassing

类对象 绑定 到 ALL CONTROL 时， 可以捕获消息。

#1 写类， 开启

class CButtonImpl : public CWindowImpl<CButtonImpl, CButton>
{
    BEGIN_MSG_MAP_EX(CButtonImpl)
        MSG_WM_SETCURSOR(OnSetCursor)
    END_MSG_MAP()
 
    LRESULT OnSetCursor(HWND hwndCtrl, UINT uHitTest, UINT uMouseMsg)
    {
    static HCURSOR hcur = LoadCursor ( NULL, IDC_SIZEALL );
 
        if ( NULL != hcur )
            {
            SetCursor ( hcur );
            return TRUE;
            }
        else
            {
            SetMsgHandled(false);
            return FALSE;
            }
    }
};

#2 声明对象

class CMainDlg : public CDialogImpl<CMainDlg>
{
protected:
    CButtonImpl m_wndAboutBtn;
};

#3 链接 类和控件

LRESULT CMainDlg::OnInitDialog(...)
{
    // CButtonImpl: subclass the About button
    m_wndAboutBtn.SubclassWindow ( GetDlgItem(ID_APP_ABOUT) );
    return TRUE;
}

2. WTL_DoDataExchange 

绑定ALL  CONTROL 到 类时, 可以捕获消息。 

绑定Edit, Radio 到 变量 时, 可以直接更新数据.

o1 捕获消息的

#1 开启

class CMainDlg : public CDialogImpl<CMainDlg>, 
                 public CWinDataExchange<CMainDlg>
{
};

#2 写类

class CEditImpl : public CWindowImpl<CEditImpl, CEdit>
{
    BEGIN_MSG_MAP_EX(CEditImpl)
        MSG_WM_CONTEXTMENU(OnContextMenu)
    END_MSG_MAP()
 
    void OnContextMenu ( HWND hwndCtrl, CPoint ptClick )
    {
        MessageBox("Edit control handled WM_CONTEXTMENU");
    }
};

#3 链接 对象和控件

class CMainDlg : public CDialogImpl<CMainDlg>, 
                 public CWinDataExchange<CMainDlg>
{
    BEGIN_DDX_MAP(CMainDlg)
        DDX_CONTROL(IDC_EDIT, m_wndEdit)
    END_DDX_MAP()
protected:
    CEditImpl   m_wndEdit;
};

#4 触发

LRESULT CMainDlg::OnInitDialog(...)
{
    m_wndAboutBtn.SubclassWindow ( GetDlgItem(ID_APP_ABOUT) );
 
    // First DDX call, hooks up variables to controls.
    DoDataExchange(false);
    return TRUE;
}

o2 直接更新数据的

#1 绑定 变量 到 Control

class CMainDlg : public ...
{
//...

    BEGIN_DDX_MAP(CMainDlg)
        DDX_CONTROL(IDC_EDIT, m_wndEdit)
        DDX_TEXT(IDC_EDIT, m_sEditContents)
        DDX_INT(IDC_EDIT, m_nEditNumber)
    END_DDX_MAP()
 
protected:
    // DDX variables

    CString m_sEditContents;
    int     m_nEditNumber;
};

#2 触发

LRESULT CMainDlg::OnOK ( UINT uCode, int nID, HWND hWndCtl )
{
CString str;
 
    // Transfer data from the controls to member variables.

    if ( !DoDataExchange(DDX_SAVE) )
        return;
 
    m_wndList.DeleteAllItems();
 
    m_wndList.InsertItem ( 0, _T("DDX_TEXT") );
    m_wndList.SetItemText ( 0, 1, m_sEditContents );
 
    str.Format ( _T("%d"), m_nEditNumber );
    m_wndList.InsertItem ( 1, _T("DDX_INT") );
    m_wndList.SetItemText ( 1, 1, str );
}