Thanks for the reply Laurent. Yes I did generate a BridgeSupport file and included it in my build. I did try to call the method and pass in a pointer for the item reference (using Pointer.new_for_type('@')) but the object that was assigned after the call was some weird NSCFType object which, when I googled it, basically translates to "you're screwed" :) I do get some malloc warnings when I include the bridgesupport file so I was a bit uneasy about the whole thing. I'll try writing my own Objective-C class. I'm looking forward to getting past this issue. Cheers, Karl On Tue, Apr 21, 2009 at 6:44 AM, Laurent Sansonetti <lsansonetti@apple.com> wrote:

Hi Karl,

On Apr 19, 2009, at 8:17 PM, Karl Varga wrote:

...

Hi there,

I am having a strange problem that other people don't seem to be having because I can't find any references to in google searches.  I am using MacRuby 0.4 installed from the binary available on the macruby binary releases page (MacRuby version 0.4 (ruby 1.9.1) [universal-darwin9.5, x86_64])

I have an application which stores username/passwords in the keychain. I can add items to the keychain (so I can call SecKeychainAddGenericPassword() fine and therefore I think my setup must be OK), but I cannot retrieve them.  When I call:

  status, *data = SecKeychainFindGenericPassword(       nil, service.length, service, username.length, username)

I get an error:

Configuration.app/Contents/Resources/Controller.rb:99:in `SecKeychainFindGenericPassword': wrong number of arguments (5 for 8) (ArgumentError)

The method signature is this:

OSStatus SecKeychainFindGenericPassword (  CFTypeRef keychainOrArray,  UInt32 serviceNameLength,  const char *serviceName,  UInt32 accountNameLength,  const char *accountName,  UInt32 *passwordLength,  void **passwordData,  SecKeychainItemRef *itemRef );

All the examples I've read suggest that this method in macruby should only take 5 args and return the status, password length, password string and item reference (the last 3 extracted from *data) instead of passing in pointers (which I don't know how to do BTW).

What gives?  Anyone have any idea or had the same problem?

I am surprised you were able to call SecKeychainFindGenericPassword() from MacRuby, did you generate a BridgeSupport file for the Security framework?

As for your question, MacRuby currently doesn't support the RubyCocoa way of dealing with returned-by-reference arguments (which is what you're trying to do I think), so you must allocate Pointer objects instead. In the case of this call it may be painful, so I would recommend to wrap this in an Objective-C class in the interim and use that class from MacRuby.

HTH, Laurent

-- Karl Varga kjvarga@gmail.com Cell: +61 (0)4 2075 1356