I was building a very simple drawing application, but met problems when reading the file saved by my application.
The two functions as to archiving/unarchiving are as follows: - (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError { return [NSKeyedArchiver archivedDataWithRootObject:view.drawing]; } - (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError { NSBezierPath *drawing = [NSKeyedUnarchiver unarchiveObjectWithData:data]; //*** returns nil if (drawing == nil) { return NO; } else { view.drawing = drawing; return YES; } } Nothing appeared when I opened a saved file, and log said: 2008-04-23 23:33:44.127 EasyDraw[631:10b] *** -[NSDocumentController localizedFailureReason]: unrecognized selector sent to instance 0x11b210 2008-04-23 23:33:44.128 EasyDraw[631:10b] *** -[NSDocumentController localizedFailureReason]: unrecognized selector sent to instance 0x11b210 I don't know what the log means. Besides, I found the value returned by [NSKeyedUnarchiver unarchiveObjectWithData:data] was nil, but I didn't understand why, since it was normal when I saved the file using [NSKeyedArchiver archivedDataWithRootObject:view.drawing]. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]