On Tue, Jan 20, 2009 at 4:38 PM, Andrew Farmer <andf...@gmail.com> wrote:
> On 20 Jan 09, at 13:36, Mohan Parthasarathy wrote: > >> On Tue, Jan 20, 2009 at 1:23 PM, Andrew Farmer <andf...@gmail.com> wrote: >> >>> On 20 Jan 09, at 12:22, Mohan Parthasarathy wrote: >>> >>> I want to be able to establish the TCP connection to a server and do >>>> multiple HTTP GETs with different URLs. I thought will achieve this by >>>> allocating a NSURLConnection and then initWithRequest:urlRequest with a >>>> different URL everytime as there is no other way to set the URL. It >>>> looks >>>> like that this is not working and the URL is not changing. >>>> >>> >>> Initializing ObjC objects multiple times is always incorrect. Don't do >>> it! >>> >> >> Ok. Is it because init assumes that it is allocating memory for the first >> time and hence may cause leaks if called multiple times ? At least it >> seems >> to work now. >> > > Internally, any number of things may be happening during initialization. > Calling the initializer multiple times on an object is invalid, and may > result in memory leaks, crashes, or other incorrect behavior; moreover, even > if it appears to work correctly in a given system version, there is no > guarantee that it will continue to behave similarly in future versions of > the OS. Even minor updates may change the behavior - it's undefined, and is > under absolutely no obligation to remain constant. > > Seriously, don't do it. Ok. Point taken. > > > Is there a way to not to allocate the connection everytime i need to send >>>> a new request ? >>>> >>> >>> Yes. I'm pretty sure that the URL loading framework will use HTTP >>> keepalives automatically when appropriate. >>> >> >> I am not sure i undrstood this. If i allocate a NSURL connection >> everytime >> i need to fetch from a URL, wouldn't it set up a TCP connection everytime >> and then download the data. If i can avoid that, wouldn't it be nice ? >> > > Again, I'm pretty sure that the Cocoa URL loading functions will do this > for you as appropriate. Trying to implement it yourself is unnecessary, and > trying to go about it this particular way is futile as well as incorrect. I don't want to do this myself. But i don't see anything in NSURLConnection that would do this. If so, please point to me. Thanks mohan _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
