Re: convert password from SecKeychainFindGenericPassword to NSString
Re: convert password from SecKeychainFindGenericPassword to NSString
- Subject: Re: convert password from SecKeychainFindGenericPassword to NSString
- From: Stuart Malin <email@hidden>
- Date: Sun, 31 Jan 2010 21:28:11 -0500
On Jan 31, 2010, at 9:12 PM, Kyle Sluder wrote:
> On Sun, Jan 31, 2010 at 5:51 PM, Stuart Malin <email@hidden> wrote:
>> I acquire a password from a keychain using SecKeychainFindGenericPassword. That provides a non null terminated c string and a length. I had been using [NSString stringWithCString: length:] to get an NSString instance of the password. However, the +stringWithCString:length: method was deprecated way back, so I thought I'd clean up my code and use +stringWithCString:encoding: -- however that doesn't work because the supplied C string isn't null terminated. I did a bit of searching, and found in the archives on CocoaBuilder [1] someone's solution back in September of 2005, which was to copy the acquired password to a new buffer of 1 additional byte and create a new null terminated C string there:
>
> You could wrap the provided buffer with an NSData and use -[NSString initWithData:encoding:].
If I use +dataWithBytes:length: then I need to specify a length 1 greater, and that additional byte must be set to 0 (to null terminate the string). So, I could use NSMutableData, then -resetBytesInRange: to zero out the last byte, which requires creating an NSRange struct, and that all seems heavier than just using the C code. But then, the processor is fast, and this is code that is run rarely, so optimizing isn't important. I guess it is just a question of style...
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