Join the 80,000 other DTN customers who enjoy the fastest, most reliable data available. There is no better value than DTN!

(Move your cursor to this area to pause scrolling)




"I "bracket trade" all major news releases and I have not found one lag or glitch with DTN.IQ feed. I am very comfortable with their feed under all typical news conditions (Fed releases, employment numbers, etc)." - Comment from Public Forum
"Everything is working amazing now. I'm already impressed with the true-tick feed of IQFeed and it's ability to support my 480 symbol layout." - Comment from Tyler via Email
"If you are serious about your trading I would not rely on IB data for serious daytrading. Took me a while to justify the cost of IQ Feed and in the end, it's just a 2 point stop on ES. Better safe than sorry" - Comment from Public Forum
"My broker in Davenport suggested I give you a try as he uses your service and says its the best." - Comment from Bill via RT Chat
"Interactive Brokers tick data was inconsistent, so I have switched to using DTN exclusively. It is great to no longer have to worry about my datafeed all day long." - Comment from Philippe
"I am a hedge fund manager here. It’s funny, I have a Bloomberg terminal and a Bridge feed, but I still like having my DTN feed!" - Comment from Feras
"I am very happy I changed. I love the product, but more so I am thrilled with Tech Support. You are knowledgeable, polite, pleasant and professional." - Comment from Pat
"Everything is working great with the API. I love it." - Comment from Calvin
"I am enjoying the feed very much - so superior to the broker provided feed I was previously using." - Comment from George
"DTN feed was the only feed that consistently matched Bloomberg feed for BID/ASK data verification work these past years......DTN feed is a must for my supply & demand based trading using Cumulative Delta" - Comment from Public Forum Post
Home  Search  Register  Login  Blogs Recent Posts

Information on DTN's Industries:
DTN Oil & Gas | DTN Trading | DTN Agriculture | DTN Weather
Follow DTN_IQFeed on Twitter
DTN.IQ/IQFeed on Twitter
DTN News and Analysis on Twitter
»Forums Index »Product Support »DTN Satellite Products »DTN - NxCoreAPI 2.4 - processTape runs out of memory - who/when to delete msgs?
Author Topic: DTN - NxCoreAPI 2.4 - processTape runs out of memory - who/when to delete msgs? (4 messages, Page 1 of 1)

jerry walton
-Interested User-
Posts: 3
Joined: May 3, 2008


Posted: May 3, 2008 02:40 PM          Msg. 1 of 4
I am running the NxCoreAPI sample program (SampleOne) with Visual C++ 2008 Express Edition.

I have read all the documentation and the sample programs and did NOT find a single delete
statement anywhere?

who is responsible for deleting the messages received in the callback?

int __stdcall nxCoreCallback(const NxCoreSystem* pNxCoreSys, const NxCoreMessage* pNxCoreMsg)

who deletes pNxCoreSys and pNxCoreMsg?
when can these be deleted?

jerry walton
-Interested User-
Posts: 3
Joined: May 3, 2008


Posted: May 3, 2008 03:40 PM          Msg. 2 of 4
I thought about it and since the NxCoreAPI is a DLL,
then it is probably a not a good idea to delete an object (memory)
that was allocated by the DLL.

what I am experiencing is that when running SampleOne.cpp to process a tape
and displaying a simple counter - that the program memory just gorws and grows
until eventually the program crashes because it runs out of memory.

so what is the correct way to handle the freeing of resources?

it there anything to code to fix this problem?

DTN_Steve_S
-DTN Guru-
Posts: 2069
Joined: Nov 21, 2005


Posted: May 5, 2008 10:39 AM          Msg. 3 of 4
Hello Jerry, Unfortunately, there is noone that monitors these forums who is familiar with the NXCore product line to answer your questions. I have contacted the NXCore support personel and they should be contacting you via email (the address you provided in your message board profile).

jerry walton
-Interested User-
Posts: 3
Joined: May 3, 2008


Posted: May 5, 2008 12:01 PM          Msg. 4 of 4
I got this figured out.

It seems that a program using the NxCoreAPI.dll to process a tape,
will grow in memory usage up to about 45-50 MB and then "top off".

I was stopping the program prior to that point because I was
unsure if there was some responsibility on my part to free the
memory used by the messages.

I figured that since the memory was allocated in the NxCoreAPI.dll
that is was the responsibility of the dll to de-allocate/free the memory.

The documentation makes no mention of responsibility for freeing memory
used by messages or the fact that it will grow to a certain point and then catch up.
 

 

Time: Sat February 16, 2019 3:14 AM CFBB v1.2.0 15 ms.
© AderSoftware 2002-2003