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»Forums Index »Archive (2017 and earlier) »IQFeed Developer Support »tick data historical request - dataPointsPerSend?
Author Topic: tick data historical request - dataPointsPerSend? (3 messages, Page 1 of 1)

traps
-Interested User-
Posts: 15
Joined: May 24, 2011
Posted: Jun 16, 2011 06:44 AM          Msg. 1 of 3
Hi

When using the historical lookup COM method ReqHistoryTickTimeframe, I am wondering how one is supposed to use the dataPointsPerSend parameter.

If it is set to some non-zero value, say 100, then the time-series of ticks will be split up into separate messages, each with no more thant 100 ticks in it.

My question is, how do I know when all the messages/ticks have been received? My call-back will get called for each message, but is there a way to tell when all messages pertaining to this request have been received? Since I do not know the number of ticks beforehand, I do not know how many messages to expect.

thanks

DTN_Steve_S
-DTN Guru-
Posts: 2093
Joined: Nov 21, 2005
Posted: Jun 16, 2011 08:12 AM          Msg. 2 of 3
Hello, per the documentation, you should receive an endmsg when any lookup completes.

However, there is a bug in 4.7.2.0 which will cause a request to sometimes not complete properly in the HistoryCOM interface. This has been fixed in the 4.8 beta available on the developer site.

traps
-Interested User-
Posts: 15
Joined: May 24, 2011
Posted: Jun 16, 2011 08:48 AM          Msg. 3 of 3
I see, I misunderstood the behaviour (thinking ENDMSG occurred with every callback).

thanks again
 

 

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