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PureBytes Links
Trading Reference Links
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Yes I agree,
It can work only for few data, /second and it's not always stable
Emmanuel
----- Original Message -----
From: JeRRyWar <drwar@xxxxxxxxxxxx>
To: 'Philippe Lhermie' <philippe.lhermie@xxxxxxxxxxx>;
'Omega-List@xxxxxxxxxx' <omega-list@xxxxxxxxxx>; 'BobR'
<bobrabcd@xxxxxxxxxxxxx>
Sent: Friday, July 21, 2000 3:52 PM
Subject: RE: DDE vs TCP/IP
> DDE SUCKS -- There are no two ways about it.
>
> -----Original Message-----
> From: Philippe Lhermie [mailto:philippe.lhermie@xxxxxxxxxxx]
> Sent: Friday, July 21, 2000 3:27 PM
> To: Omega-List@xxxxxxxxxx; BobR
> Subject: RE: DDE vs TCP/IP
>
>
> Hi Bob,
>
>
> Here is what Microsoft says about DDE links:
>
> The Microsoft® Win32® application programming interface (API) provides
> several methods for transferring data between applications. One method is
to
> use the Win32 dynamic data exchange (DDE) protocol. The DDE protocol is a
> set of messages and guidelines. It sends messages between applications
that
> share data and uses shared memory to exchange data between applications.
> Applications can use the DDE protocol for one-time data transfers and for
> continuous exchanges in which applications send updates to one another as
> new data becomes available.
>
>
> There are two kinds of permanent DDE data links: warm and hot. In a warm
> data link, the server notifies the client that the value of the data item
> has changed, but the server does not send the data value to the client
until
> the client requests it. In a hot data link, the server immediately sends
the
> changed data value to the client.
>
> DDE can be used to implement a broad range of application features - for
> example:
>
> Linking to real-time data, such as to stock market updates, scientific
> instruments, or process control.
>
>
>
> Rgds,
>
> Philippe
>
>
> -----Message d'origine-----
> De : BobR [mailto:bobrabcd@xxxxxxxxxxxxx]
> Envoyé : vendredi 21 juillet 2000 17:44
> À : omega-list@xxxxxxxxxx
> Objet : DDE vs TCP/IP
>
>
>
> Here is a question for the data experts who know the real story. Since
I've
> been kind of hung up on tick counts and have been experimenting with the
> various options of moving data it occurred to me last night that methods
> such as DDE links from say the UMDS to TradeX or other software such as
> Fibonacci Trader might suffer some tick loss. Its my novice understanding
> that DDE clients request data from the DDE server at fixed or user
selected
> intervals with the minimum being one second, could be wrong here. The
> consequences being that if multiple ticks occur for a symbol within the
> update interval, then only the last one is passed out of the server to the
> client application. Is there a way to have the dde clients update with
each
> price update or is the dde method limited to fixed intervals of polling
> time? Three configurations in particular are of interest: 1. DTN to UMDS
to
> Dynastore to TS4, 2. DTN to UMDS to Dynastore to TCP/IP to client, 3. DTN
> to UMDS to UsDDE to TradeX.
>
> Thanks,
> BobR
>
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