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Hello,
Yes -1 means "ALL". Any positive number means number of bars
to retrieve.
In real time mode this function will get the same quotes as
are available for the display
- it is includes last TRADE.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
dingo
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, August 06, 2003 7:45
PM
Subject: RE: [amibroker] Re: Accessing RT
Quotes
I
dunno about the -1 in the call. Here's a line from the release
doc:
<FONT face=Arial color=#0000ff
size=2>
new method in <FONT
color=#ffffff>Quotations collection for faster <FONT
color=#ffffff>retrieval of
quoteslong <FONT
color=#ffffff>Retrieve( long Count, Variant *Date, Variant *Open,
Variant *High, Variant *Low, Variant *Close, Variant *Volume, Variant *OpenInt
);
I
seems to be a count - maybe of the number of quotes you want where -1 is
"All". You might experiment with it - and maybe try to use a small
number just if that will get you the most recent ones.
<FONT face=Arial color=#0000ff
size=2>
As
to your real time questions - I don't have the real time version so I can't
help. What I'd suggest is a lot of experimentation. AND if you do find
anything please report back so that the rest of us pioneers can avoid a few
arrows.
<FONT face=Arial color=#0000ff
size=2>
The
CSTR thing was mentioned by TJ to me:
<FONT face=Arial color=#0000ff
size=2>
As for this CStr(): the real reason for such strange
behaviour is that Stocks.Item( ticker) accepts VARIANT
as a TICKER. This is so to allow the user to reference
ticker by both number and symbol.
As you probably know Variant can hold any type.
AmiBroker does the following:
struct StockInfo * AStocks::FindStockInfoByVariant(const
VARIANT &Item){ struct StockInfo *si = NULL;
if (Item.vt ==
VT_BSTR)
{ si = FindStock( CString(
Item.bstrVal ) ) ; }
else { //
coerce to VT_I4 VARIANT va
; VariantInit( &va
); if
(SUCCEEDED(VariantChangeType( &va, (VARIANT FAR*)&Item, 0, VT_I4
)))
{ si =
StockInfoFromIndex( (int)va.lVal
); }
}
return si;}
- it checks if variant is of string type (VT_BSTR) and then
treats it as a symbol,
otherwise it tries to coerce it to the 32bit integer index
(this is because numbers passed in variant
may be floats R4, real R8, short, long integers,
etc).
Strangely enough if you do not use explicit conversion VB
puts some strange variant (I didn't checked it yet it is)
instead of simple string as anyone may think.
<FONT
size=2><SPAN
class=022083917-06082003><FONT face=Arial color=#0000ff
size=2>d
<FONT
face=Tahoma size=2>-----Original Message-----From: Gordon
[mailto:amibroker@xxxxxxxxxxxxxx] Sent: Wednesday, August 06,
2003 1:24 PMTo: amibroker@xxxxxxxxxxxxxxxSubject:
[amibroker] Re: Accessing RT QuotesAwesome. Thanks.
I read the documentation and missed retrieve -- I didn't scroll down and
see it among the new features. Thanks.I take it -1 tells it to go
the vendor as opposed to fetch a cached quote? Also, if you happen to
know, can one safely assume that a RT quote (in this case from eSignal)
is the bid/ask for the underlying, since we don't have a bar
necessarily? Or does AmiBroker, assuming the base interval of your
database is 1 min., give you the current OHLC, etc., of the most current
1 min. bar? I think this is important, especially since pre-market you
have OTC stocks for which there are no pre-market quotes, and others
where the most recent activity of any kind may have been several minutes
ago. BTW, you have a very subtle and important nuance in your code
that I only discovered last night about 1AM -- that's using CStr
in:AB.stocks(CStr(strTicker))...I was coding,
andAB.stocks("AAII") was working for me, but:Ticker =
"AAII"AB.stocks(Ticker)...was not. Finally I tried CStr, and it
worked. Definitely something to highlight in the code example for others
who might run into the same thing.Gordon --- In
amibroker@xxxxxxxxxxxxxxx, "dingo" <dingo@xxxx> wrote:>
Gordon,> > I use the following to get quotes - extremely
fast. As to how to be> certain you've got the latest - maybe
check the time?> > lngQteCount =
_>
AB.stocks(CStr(strTicker)).quotations.Retrieve(-1, varDate,
_>
varOpen, varHigh, varLow, varClose, varVolume, varOpenInt)>
> Lemme know if you find out anything.> >
d> > -----Original Message-----> From: Gordon
[mailto:amibroker@xxxx] > Sent: Wednesday, August 06, 2003 12:11
PM> To: amibroker@xxxxxxxxxxxxxxx> Subject: [amibroker]
Accessing RT Quotes> > > I got AB configured for use
with eSignal, and yes, AB manages the > number of active symbols so
that you can stay within your limit. Very > cool. I've written a
routine to loop through a list of 1,000+ symbols > looking for
pre-market gaps. I load each stock using the stocks > collection, and
then access the last quote in the quotations > collection. Easy
enough.> > What I am not sure of -- does AB refresh the
quotations collection > when you load the stock? Just to be safe,
I've been opening the stock > in AB and waiting app. 2.5 seconds
to allow AB to contact eSignal and > refresh that stock. However,
I've run into problems -- after looping > successfully through a
number of stocks, I suddenly got an error > indicating the an object
was not set. The AB screen had also been > modified -- the moveable
toolbars were rearranged and the MACD window > had been closed.
So, this does not look like a good approach.> > The only
method I see to apparently update the quotes is refreshall> () -- is
there a way to load a single stock, and be sure you have the >
latest RT quote for that stock without opening it in AB >
programatically? Any insights appreciated! > > Thanks,>
> Gordon> > > > > > Yahoo!
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