How do I detect if a column is set readonly?

There are several ways for setting readonly, e.g. dataset level
(dataset.ReadOnly: field=true;noedit) or same at connection level,
preventediting, readonly of dataset and/or column etc. etc.

I tried to achieve that by calling GetAttributeParamsEx() or
IsColAttributeSet[] but it doesn't work.

So is there an easy way to catch all possibilities for a simple but
complete detection of readonly state of a column?

--
Andreas