CDialog::OnCancel
The framework calls this method when the user clicks Cancel or presses the ESC key in a modal or modeless dialog box.
virtual void OnCancel( );
Remarks
Override this method to perform actions (such as restoring old data) when a user closes the dialog box by clicking Cancel or hitting the ESC key. The default closes 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 method and call DestroyWindow inside it. Do not call the base-class method, because it calls EndDialog, which will make the dialog box invisible but not destroy it.
Note
You cannot override this method when you use a CFileDialog object in a program that is compiled under Windows XP. For more information about CFileDialog, see CFileDialog Class.
Example
void CSimpleDlg::OnCancel()
{
// TODO: Add extra cleanup here
// Ensure that you reset all the values back to the
// ones before modification. This handler is called
// when the user doesn't want to save the changes.
if (AfxMessageBox(_T("Are you sure you want to abort the changes?"),
MB_YESNO) == IDNO)
{
// Give the user a chance if he has unknowingly hit the
// Cancel button. If he says No, return. Don't reset. If
// Yes, go ahead and reset the values and close the dialog.
return;
}
m_nMyValue = m_nPrevValue;
m_pMyString = NULL;
CDialog::OnCancel();
}
Requirements
Header: afxwin.h