CDialog::OnOk() 和 CDialog::OnCancel()之間的區別

CDialog::OnOk() 和 CDialog::OnCancel()之間的區別

如果程式中存在資料交換，OnOk可以自動更新和驗證。OnCancel則不進行此項操作。

MSDN的解釋:
CDialog::OnOK 
Called when the user clicks the OK button (the button with an ID of IDOK).
virtual void OnOK( );

Remarks
Override this member function to perform the OK button action. If the dialog box includes automatic data validation and exchange, the default implementation of this member function validates the dialog-box data and updates the appropriate variables in your application.

If you implement the OK button in a modeless dialog box, you must override the OnOK member function and call DestroyWindow from within it. Don't call the base-class member function, because it calls EndDialog, which makes the dialog box invisible but does not destroy it.

CDialog::OnCancel 
The framework calls this member function when the user clicks the Cancel button or presses the ESC key in a modal or modeless dialog box.

virtual void OnCancel( );
 

Remarks
Override this member function to perform Cancel button action. The default simply terminates a modal dialog box by calling EndDialog and causing DoModal to return IDCANCEL.

If you implement the Cancel button in a modeless dialog box, you must override the OnCancel member function and call DestroyWindow from within it. Don't call the base-class member function, because it calls EndDialog, which will make the dialog box invisible but not destroy it.

 

 

 

原始碼：

void CDialog::OnOK()
{
 if (!UpdateData(TRUE))
 {
  TRACE(traceAppMsg, 0, "UpdateData failed during dialog termination./n");
  // the UpdateData routine will set focus to correct item
  return;
 }
 EndDialog(IDOK);
}

void CDialog::OnCancel()
{
 EndDialog(IDCANCEL);
}