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.
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.
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