I don't think you need the BS preview for that. I can create a BS file with: $ 
gen_bridge_metadata -f Security -o Security.bridgesupport

On 19 nov 2010, at 20:39, Joshua Ballanco wrote:

> Hey James,
> 
> The C API for the Keychain is not annotated with a bridge support file by 
> default in SnowLeopard, so the first thing you'll need to do is install the 
> BridgeSupport preview. Then you need to know what to put in for the 4 
> parameters to the method call, which unfortunately is not documented at 
> developer.apple.com (at least, not that I could find). There is, however, 
> headerdoc for the method in 
> /System/Library/Frameworks/Security.framework/Headers/SecKeychainItem.h:
> 
>  /*!
>          @function SecKeychainItemModifyAttributesAndData
>          @abstract Updates an existing keychain item after changing its 
> attributes or data.
>          @param itemRef A reference to the keychain item to modify.
>          @param attrList The list of attributes to modify, along with their 
> new values. Pass NULL if you don't need to modify any attributes.
>          @param length The length of the buffer pointed to by data.
>          @param data Pointer to a buffer containing the data to store. Pass 
> NULL if you don't need to modify the data.
>          @result A result code. See "Security Error Codes" (SecBase.h).
>          @discussion The keychain item is written to the keychain's permanent 
> data store. If the keychain item has not previously been added to a keychain, 
> a call to the SecKeychainItemModifyContent function does nothing and returns 
>  noErr.
>  */
> 
> So, I'm not sure if that's what you're looking for. Hopefully it's at least a 
> start. The projects look awesome, and if/when I have some more time I'd love 
> to help you out :-)
> 
> Cheers,
> 
> Josh
> 
> On Fri, Nov 19, 2010 at 9:36 AM, James Chen <ashc...@gmail.com> wrote:
> Hi guys,
> 
> Gmail Notifr was originally written in RubyCocoa, which runs as a little 
> NSStatusBar app and checks your gmail feeds at specified intervals. I started 
> updating it to MacRuby last month.
> 
> Most changes were just simply updating method_arg1_arg2 to method(arg1:arg2). 
> Since this app saves account/password in Keychain, I also extracted the 
> keychain access code to a separate project. Still have some difficulties on 
> Security.framework's C methods. I also need to make the growl notification 
> work later.
> 
> I know many guys are interested in how to make menu bar (NSStatusBar) 
> application so I guess this in progress project might help a little. The 
> project repository is: https://github.com/ashchan/gmail-notifr , and the 
> keychain access wrapper project is here: 
> https://github.com/ashchan/macruby-keychain-wrapper .
> 
> Regarding the C methods calling, the keychain wrapper has to access this API:
> 
>     SecKeychainItemModifyAttributesAndData
> 
> It would be really great if anyone knows how to construct 
> SecKeychainAttributeList and other necessary parameters for this API and 
> offers some help.
> 
> ---
> James Chen
> ashchan.com | @ashchan 
> 
> 
> _______________________________________________
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> MacRuby-devel@lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
> 
> 
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