VC++6.0 UpdateData() 函数

        函数UpdateData实践内容：

         MSDN上的内容：

         

CWnd::UpdateData

BOOL UpdateData( BOOL bSaveAndValidate = TRUE );

Return Value

Nonzero if the operation is successful; otherwise 0. If bSaveAndValidate is TRUE, then a return value of nonzero means that the data is successfully validated.

Parameters

bSaveAndValidate

Flag that indicates whether dialog box is being initialized (FALSE) or data is being retrieved (TRUE).

Remarks

Call this member function to initialize data in a dialog box, or to retrieve and validate dialog data.

The framework automatically calls UpdateData with bSaveAndValidate set to FALSE when a modal dialog box is created in the default implementation of CDialog::OnInitDialog. The call occurs before the dialog box is visible. The default implementation of CDialog::OnOK calls this member function with bSaveAndValidate set to TRUE to retrieve the data, and if successful, will close the dialog box. (If the Cancel button is clicked in the dialog box, the dialog box is closed without the data being retrieved.)

CWnd Overview |  Class Members |  Hierarchy Chart

See Also   CWnd::DoDataExchange

        /**************************************************************************************************************

        *    函数名称: UpdateData();

        *    返回值    :  操作成功返回一个非零整数，否则返回0；

        *                     如果参数bSaveAndValidate  是TRUE，返回值是非零，表示：“数据生效”；

        *     参数      :  bSaveAndValidate   = FALSE  表示，将控件的值赋值给绑定的变量，

        *                     bSaveAndValidate   = TRUE  表示，将绑定的变量的值在对话框上显示；

        *     描述      :  对话框（dialog）的控件与变量之间的初始化。

        **************************************************************************************************************/

 

 关于“编辑框”与“变量”之间的关联。可以在“类向导”中的“Member Variables” 中设置和查看到。