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Define a callback function on selection event : it is called when the user has selected a file.Parameters
OpenBox _DLGrflopen ( OpenBox _openfile_ fun [OpenBox u0 P u1] _callback_ u0 _user_ )
Return value
_openfile_ any open single-file selection box. _callback_ callback function on selection event (supplemental parameter is the selected file) _user_ user parameter
same selection box