DDE Datafeed

Quote from Antonio Leite:

Agreed and that’s one of the reasons I choose not to support eSignal. I would never get closer to their 1,500 DDE quotes with such an API.

I would like to support eSignal though if some alternative appears

Antonio Leite
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To be fair about eSignal, the non-commercial API (ActiveX API) is an end-user product and is pretty new.

Thus comparing to their matured Standard Programming API (which we've worked with for so many years on NeoTicker), the ActiveX API is less powerful and will take time for this service to mature.

Over the years, we've implemented our version of DDE link from NeoTicker to external apps, but we are not really focus on the support of this technology because of the constraints. Although we are able to work out some extra features over the data feed vendors (like data arrays, formula results, etc.), it is still very basic in terms of functionality.

If someone is interested to implement better DDE server capability to improve over what eSignal has, it is definitely good news.
 
Quote from Lawrence Chan:

To be fair about eSignal, the non-commercial API (ActiveX API) is an end-user product and is pretty new.

Thus comparing to their matured Standard Programming API (which we've worked with for so many years on NeoTicker), the ActiveX API is less powerful and will take time for this service to mature.

....

If someone is interested to implement better DDE server capability to improve over what eSignal has, it is definitely good news.
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Thanks for the Standard Programming API tip I will investigate that further and see what I can do. I’m not interested in DDE technology I’m interested in RTD which is the Excel technology QuoteLink supports. Excel end users would compare performance and limits though.

About RTD in MS site:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnexcl2k2/html/odc_xlrtdfaq.asp
 
Tks for the replies,

exactely what's the difference between DDE and Data on Demand?

Actually I need data on demand, so I think the choise is between:
-esignal
-IQfeed
-Tenfore ??

Good Trading for me today is over... I suppose... if anything doesn't chance in the mkt

B_M_S
 
I use a charting system which calculates formulas for me and then stores it in a variable which I then transfer to Excel using DDE.

I have a VB 6 program which fetches the Excel cells, loads it into an array in VB and fires off orders to my trading platform. The problem is that when my VB timer event sweeps Excel and I am in the middle of editing an Excel cell, it aborts with messages such as program being used,etc...

I think I can avoid the problem if I do all my edits in the array within VB instead of using Excel. Is there a way to avoid using the Excel sheet and port the data directly into my VB program?

Thanks
 
Quote from Lawrence Chan:

1. DDE link will not be able to handle 500+ symbols, period.

DDE is a legacy technology that Microsoft no longer support nor maintain.

You will be lucky to be able to track about 200 symbols top. No matter how fast your computer is.

2 - 4. That depends on your coding and saving of historical data, it does not depend on the DDE part.

5, 6. If you can track all the symbols real-time, then it can be done easily.

What you need is not DDE - what you need is real-time customizable breadth calculation.

There are many solutions to your problem,

1. If you like programming, then you can subscribe to eSignal with their ActiveX API service and then code from there. I am not sure about the symbol limit issue with this API.

2. If you do not like programming, then use a program like NeoTicker to do the data collection (using NeoBreadth technology) and computation for you.

Lawrence
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i use esignal dde links and i bot extra symbols...

i monitor almost 1000 symbols so it depends on where you go...

sorry neotick..:(
 
Quote from GATrader:

I use a charting system which calculates formulas for me and then stores it in a variable which I then transfer to Excel using DDE.

I have a VB 6 program which fetches the Excel cells, loads it into an array in VB and fires off orders to my trading platform. The problem is that when my VB timer event sweeps Excel and I am in the middle of editing an Excel cell, it aborts with messages such as program being used,etc...

I think I can avoid the problem if I do all my edits in the array within VB instead of using Excel. Is there a way to avoid using the Excel sheet and port the data directly into my VB program?

Thanks
More...

Hi GATrader,

Before you fetch the values in the Excel cells what about turning off editing by using an automation subRoutine... then fetching the excel values then turning editing back on... could that be a process that gets around problem...

cj...

__________________
HAVE STOP - WILL TRADE

If You Have The Vision We Have The Code
 
Thanks cj. Are you saying there is a subroutine in Excel that one can invoke which changes the sheet from edit mode into non edit mode or is this something I need to code for myself in VB? In real time all it takes is to press return after editing a cell to get out of edit but sometimes the timer beats me to it and my system appends. Thanks
 
Quote from GATrader:

Thanks cj. Are you saying there is a subroutine in Excel that one can invoke which changes the sheet from edit mode into non edit mode or is this something I need to code for myself in VB? In real time all it takes is to press return after editing a cell to get out of edit but sometimes the timer beats me to it and my system appends. Thanks
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Right... in your VB6 project you can automate (as in control) excel modes... turn things on / off etc... so you can look into this as a .50 cent solution to your workflow problem

From VB6 project code....
1. Turn off Excel Editing, etc...
2. Fetch your values
3. Turn on Excel Editing...
4. Take money to bank...

here is one link i found...

http://www.xtremevbtalk.com/archive/index.php/t-135815.html


also...
put the words: automating excel +vb in
Google search box - this will bring up plenty of info on this topic -

cheers...

cj... hthelps... :)



HAVE STOP - WILL TRADE

If You Have The Vision We Have The Code
 
It is probably best if you open a new thread about data on demand questions, as the DDE jamming here is getting serious :)

DDE stands for Dynamic Data Exchange, it is, for example, having a link between your data feed and Excel for your custom computations.

Lawrence


Quote from Big_M_Surfer:

Tks for the replies,

exactely what's the difference between DDE and Data on Demand?

Actually I need data on demand, so I think the choise is between:
-esignal
-IQfeed
-Tenfore ??

Good Trading for me today is over... I suppose... if anything doesn't chance in the mkt

B_M_S
More...
 
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