CDialog::GetDefID 

Call the GetDefID member function to get the ID of the default pushbutton control for a dialog box.


DWORD GetDefID( ) const;

A 32-bit value (DWORD). If the default pushbutton has an ID value, the high-order word contains DC_HASDEFID and the low-order word contains the ID value. If the default pushbutton does not have an ID value, the return value is 0.

This is usually an OK button.

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