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Overriding NSDocument's "document could not be opened" error message

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Overriding NSDocument's "document could not be opened" error message

Subject: Overriding NSDocument's "document could not be opened" error message
From: Glen Simmons <email@hidden>
Date: Tue, 13 Jun 2006 17:32:31 -0500

My app has a feature that lets users password protect a document. When opening a protected document, I display a dialog to enter the password. This is initiated in -readFromURL:ofType:error: in my NSDocument subclass. If the user clicks cancel in this password dialog, I return NO from -readFromURL:ofType:error: so no document will be created. The problem is that Cocoa helpfully displays an error message saying "The document "Foo" could not be opened." Since the user cancelled the operation, an error message here is not appropriate. How do I keep that error from being displayed?

Thanks,
Glen Simmons
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