Re: Get MD5 without crashing
Re: Get MD5 without crashing
- Subject: Re: Get MD5 without crashing
- From: Roland King <email@hidden>
- Date: Tue, 04 Nov 2008 13:09:18 +0800
well no that would leak since then the crypto object wouldn't get
released. Also, I don't have the documentation for SSCrypto but I'd have
thought whatever the digest returns is already autoreleased, so
releasing it again would be wrong.
Question is how are you calling this? Is there an autorelease pool set
up somewhere which is actually getting purged? All autorelease is doing
is sticking it on the autorelease pool, if nothing cleans up the pool,
it'll just hang onto them forever.
What crash are you getting, are you getting out of memory or are you
getting a crash because you're accessing an already freed object or
freeing it twice?
Alex Heinz wrote:
You probably want [[[crypto digest:@"MD5"] hexval] autorelease]. This
will add the NSString object to the autorelease pool, instead of the
SSCrypto object, as you are doing now.
HTH,
Alex
On Nov 3, 2008, at 9:05 PM, Mr. Gecko wrote:
Hello I am trying to MD5 a whole bunch of strings and I choose
SSCrypto for it, but for some reason, it crashes because of memory.
I know it has to do with releasing, I haven't found much details on
when to use release and autorelease; so this is a huge task for me
to find out.
Here is my method I have made.
- (NSString *)md5:(NSString *)MD5 {
SSCrypto *crypto = [[SSCrypto alloc] init];
[crypto setClearTextWithString:MD5];
return [[[crypto autorelease] digest:@"MD5"] hexval];
}
if you could point out what I am doing wrong, I would be great full.
Thanks,
Mr. Gecko
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