Cocoa Services Programming - How to identify whether the selected item is a folder or file wih NSFilenamesPboardType set as the send type?

I have some queries regarding Services menu validation . I would like to enable different services provided by my app based on whether a file or folder is selected in the Finder.

I have set NSFilenamesPboardType as the send type for the services开发者_StackOverflow社区 . I have gone through the - (id)validRequestorForSendType:(NSString *)sendType returnType:(NSString *)returnType method but my issue is that the validation there seems to be done based on the sendType and return type. In my case , the selected file and folder pasteboard type is the same and I cannot determine whether the selected item in the Finder is a file or folder during the validation process ( This is before the actual service gets invoked i.e when the services menu is being shown to the user ) ?

So my question is that is there any way I can get some info about the selected item in the Finder and validate the different service menus offered by my application based on some info regarding the item rather than the basic validation of the send and return types ?

I am not able to find out any manner to do so but "Folder Actions" service in Snow Leopard gets enabled only for folders so it can be done. I did a /System/Library/CoreServices/pbs -dump_pboard and it is using a NSFilenamePBoardType also yet manages to activate only for folders.

Thanks in advace for any help .

To distinguish between files and folders you might be able to use the following in NSFileManager:

fileExistsAtPath:isDirectory:

http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html#//apple_ref/occ/instm/NSFileManager/fileExistsAtPath:isDirectory:

But you'd need to have the path string.

you can use NSString *string = [pboard stringForType:NSPasteboardTypeString]; to get the path of the folder or file.then you you can know whether it's a folder or not.