NSImageView subclass to get the filename of the dropped image and to disable deleting and cutting the image. The class sends a "KSImageDroppedNotification" with the image filename in the userinfo dictionary. I got the idea from: http://www.cocoabuilder.com/archive/cocoa/121824-how-do-capture-the-filename-of-an-image-dropped-in-an-nsimageview.html

KSImageView.h

#import <Cocoa/Cocoa.h>

@interface KSImageView : NSImageView

@end

KSImageView.m

#import "KSImageView.h"

@implementation KSImageView

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
  BOOL acceptsDrag = [super performDragOperation:sender];

	if (acceptsDrag) {
		NSPasteboard *pboard = [sender draggingPasteboard];
		NSString *plist = [pboard stringForType:NSFilenamesPboardType];
		
		if (plist) {
			
			NSArray *files = [NSPropertyListSerialization propertyListFromData:[plist dataUsingEncoding:NSUTF8StringEncoding]
                                                              mutabilityOption:NSPropertyListImmutable
                                                                        format:nil
                                                              errorDescription:nil];

			if ([files count] == 1) {
				NSDictionary *userInfo = @{@"imageFileName" : [[files objectAtIndex: 0] lastPathComponent]};
								
				[[NSNotificationCenter defaultCenter] postNotificationName:@"KSImageDroppedNotification"
																	object:nil
																  userInfo:userInfo];
			}
		}
	}
	
	return acceptsDrag;
}

- (void) delete:(id)sender {
}

- (void) cut:(id)sender {
}

@end

Hi - it looks like you are using the wrong method to push the notification as you aren't including the userInfo. Try use the method with with the userinfo overloader.

Great job- would be interesting to see if there was a way to detect if the image was pasted into using the menu