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»Forums Index »IQFeed Developer »IQFeed Developer Support »HWX, HMX
Author Topic: HWX, HMX (5 messages, Page 1 of 1)

-Interested User-
Posts: 3
Joined: May 25, 2021


Posted: May 25, 2021 07:47 AM          Msg. 1 of 5
Hello, is there anything specific we need to have in order for HWX and HMX to work?
Using it as per the example:


I'm getting "Invalid number of parameters." coming back.

thanks in advance for any help

-DTN Guru-
Posts: 443
Joined: Aug 22, 2014

Posted: May 25, 2021 07:55 AM          Msg. 2 of 5
Researching your question. I will have an answer shortly.

Stephen Shockey
Senior Customer Support Representative and Product Support Specialist


-Interested User-
Posts: 69
Joined: Jul 30, 2018

IQML - IQFeed-MATLAB connector

Posted: May 25, 2021 08:00 AM          Msg. 3 of 5
You're probably using an old version of the IQFeed client (IQConnect), version 6.0 or older - these versions used fewer parameters (the IncludePartialDatapoint parameter was added in client version 6.1). Simply install the latest IQFeed client and this problem will probably be resolved.

Yair Altman
IQML - IQFeed-MATLAB connector

I am not a DTN employee; my post reflects my personal opinion

-DTN Guru-
Posts: 267
Joined: Jul 3, 2019

Posted: May 25, 2021 08:45 AM          Msg. 4 of 5
It's not the version of the IQFeed client that dictates what iteration of the API you get. Each time you connect to a port, you must send a S,SET PROTOCOL command. If you don't, the IQFeed API defaults to the oldest protocol, 4.9. The format of API commands and responses can vary in different protocols. Altmany is correct that IncludePartialDatapoint was added in protocol 6.1. If you include it in an older protocol, the API will respond that you are using the "wrong" number of parameters, because you're sending more than it expects. Send the S,SET PROTOCOL 6.1 command and you will get a response S,CURRENT PROTOCOL,6.1. Then your HWX/HMX command will work correctly.

The version of the IQConnect client has nothing to do with the API protocol, except that you can only specify a protocol that is equal to or older than your client software. You can't request protocol 6.2 unless you are using version 6.2 of the client software, for example.

Gary Stephen
DTN IQFeed Implementation Support Specialist

-Interested User-
Posts: 3
Joined: May 25, 2021


Posted: May 26, 2021 02:29 AM          Msg. 5 of 5
Hi Stephen, Yair, Gary,
Thanks very much for your help - setting the protocol to 6.1 to match the client version
has done the trick!
Much appreciated,



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