如何分析ddx和ddy_ddx_cbstring_ddx在0轴之上图解(3)

BOOL bOK = FALSE; // assume failure

TRY

{

DoDataExchange(&dx);

bOK = TRUE; // it worked

}

CATCH(CUserException, e)

{

// validation failed - user already alerted, fall through

ASSERT(!bOK);

// Note: DELETE_EXCEPTION_(e) not required

}

AND_CATCH_ALL(e)

{

// validation failed due to OOM or other resource failure

e->ReportError(MB_ICONEXCLAMATION,

AFX_IDP_INTERNAL_FAILURE);

ASSERT(!bOK);

DELETE_EXCEPTION(e);

}

END_CATCH_ALL

pThreadState->m_hLockoutNotifyWindow = hWndOldLockout;

return bOK;

}

在对话框的重载函数DoDataExchange中，又调用CDialog::DoDataExchange(pDX)

void CSquare::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(CSquare)

DDX_Text(pDX, IDC_LENGTH, m_length);

DDV_MinMaxInt(pDX, m_length, 10, 200);

//}}AFX_DATA_MAP

}

UpdateData(TRUE); // 更新数据为真，则表示控件->成员变量

UpdateData(FALSE);// 更新数据为假，则表示成员变量->控件

所以，在更新数据时我们只调用UpdateData函数就行了！

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