[MacRuby-devel] retrieving password from keychain
Laurent Sansonetti
lsansonetti at apple.com
Mon Apr 20 13:44:17 PDT 2009
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
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