I am running the COM/VB6 version of IQfeed and everything seems to be working perfectly. I am really pleased at how INCREDIBLY EASY this interface is to use. However, I am wondering if there might be a potential "timing" problem down the road somewhere.

If my Internet link takes a hit, or my VB program is too slow to keep up with the data, does DTN queue all the data for me so I won't lose any?

I LOVE IT,
Jay
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Jay, I honestly am not 100% sure what to expect in this situation.

Are you experiencing a problem where you think this may be whats happening or are you just wondering "what if"?

It hasn't been an issue that I have had to deal with (or help a developer deal with). The closest issue I can think of similar to this would be the VC++ HistoryCOM example apps. If you request even 1 day of ticks on a high volume symbol (like MSFT) for example, the app appears to lockup. but if you wait it out, it will eventually display the data. After digging into that issue previously, I found that the data does get returned to the app very quickly, but displaying the data in the text box is what is causing the "lockup".

Let me know if this helps.

I've seen this recently in C#. This is to comfirm the symptoms, and to provide a possible reason for it.

For my implementation, data coming in from IQFeed occurs in a thread different than what was used to draw the UI forms. As such, Windows has to marshal the data to ship the data across threads. This is said to be an in-efficient process. So as much of the processing as possible should be performed in this background thread, and summaries sent over to the UI thread with as little info as possible, just enough to keep the screen updated with what is needed, and when needed.

I've found that I need to redo the data retrieval routines and the UI update threads in my project in order to keep each efficient. This is something currently in progress.

So, in support of what ever is being said, IQFeed sends out a lot of data. The UI needs to be designed so that it doesn't show everything, but needs to filter, aggregate, and update at a speed appropriate for the user and the UI. Otherwise both the user and the UI will be overwhelmed.

Thanks for the comments stagrazer. I wasn't sure if it was something I had to worry about. As far as I know, I am not experiencing any problems now.

I will keep the code in the IQfeed thread as tight as possible.

Jay

Thanks for the note Steve. It was just a "what if" question. I will just keep the code as tight as I can and not worry about it.

Jay