On Dec 2, 2008, at 15:49, Sean McBride wrote:
1) Subclassing NSDocumentController and implementing
openDocumentWithContentsOfURL:display:error:. This almost works
perfectly. I can detect .foo files and do my special handling, but
when
I return nil, Cocoa 'helpfully' displays a generic error message,
which
I do not want. Even overriding willPresentError: to return nil
doesn't
suppress the alert.
Create an error with domain==NSCocoaErrorDomain and
code==NSUserCancelledError and return nil from
openDocumentWithContentsOfURL:display:error:.
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