/// file is open and end of file is not reached
bool IsOK();
/// return true if able to open file, else false
/// file is open and end of file is not reached
bool IsOK();
/// return true if able to open file, else false
and file name. If message contains the substring `$$Token',
it is replaced with the value of GetString()
*/
and file name. If message contains the substring `$$Token',
it is replaced with the value of GetString()
*/