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Re: [amibroker] Re: How to pass variables from AFL to embedded JScript?

To: <amibroker@xxxxxxxxxxxxxxx>
Subject: Re: [amibroker] Re: How to pass variables from AFL to embedded JScript?
From: "Tomasz Janeczko" <groups@xxxxxxxxxxxxx>
Date: Thu, 14 May 2009 01:19:28 +0200

PureBytes Links

Trading Reference Links

AB = CreateObject("Broker.Application");
doc = AB.ActiveDocument;
doc.Name = "EURUSD";

Best regards,
Tomasz Janeczko
amibroker.com

----- Original Message -----

From: ozzyapeman

To: amibroker@xxxxxxxxxxxxxxx

Sent: Thursday, May 14, 2009 12:36 AM

Subject: [amibroker] Re: How to pass variables from AFL to embedded JScript?

Bumping thread.

Can anyone point out why the ActiveDocument switch in the simple two lines below, generates a syntax error? I've used it many times before in JScript. But now that I am staying within AFL for OLE, that switch no longer works.

I can't find anything in the manual that says the below should be any different.

AB = CreateObject("Broker.Application"); AB.ActiveDocument.Name = "EURUSD";

--- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@xxx> wrote:
>
> I've eliminated JScript and am instead calling objects from within AFL.
> But now I am running into a syntax error on what used to be a routine
> call in JScript: ActiveDocument.Name
>
> I get a non specific syntax error when trying to set
> ActiveDocument.Name, as below. Anyone know why? Is that object treated
> differently in AFL compared to JScript? I can set it fine in JScript
> with the same code below, just switching the AB object to an ActiveX.
>
>
> Database = "F:\\AB Databases\\MyDB";
>
> AB = CreateObject("Broker.Application");
>
> AA = AB.Analysis;
>
> AB.LoadDatabase( Database );
>
> AB.ActiveDocument.Name = "EURUSD";
>
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" zoopfree@ wrote:
> >
> > Thanks for the detailed explanations Tomasz. I will rethink my
> approach on this.
> >
> > Herman - Bruce beat me to it. I indeed use his code to check status of
> the WF engine. It has proven very useful.
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" groups@ wrote:
> > >
> > > Yes I agree, of course there are always few things that make scripts
> handy, and
> > > my approach is to leave doors open in the application, however, I
> always
> > > verbally discourage certain techniques, unless someone is very well
> aware of consequences
> > > and issues behind them.
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: bruce1r
> > > To: amibroker@xxxxxxxxxxxxxxx
> > > Sent: Tuesday, May 12, 2009 3:10 PM
> > > Subject: [amibroker] Re: How to pass variables from AFL to
> embedded JScript?
> > >
> > >
> > >
> > >
> > > Tomasz -
> > >
> > > Just to make note of the some exceptions to your note about lack
> of reasons to run JScript/_vbscript_, there are still a few non-mainstream
> things that it makes possible. Just to list a few -
> > >
> > > 1.. Manipulation of COM arrays that allows a very fast way to
> get AFL arrays into and out of Excel.
> > >
> > > 2.. Detecting the closing of a COM server via the On Error logic
> in _vbscript_. Users have a bad habit of closing them and it can't be
> detected and handled in AFL.
> > > 3.. Getting lists of files and directories.
> > > 4.. Sorting CSV lists in JScript.
> > > etc....
> > >
> > > I don't like script much either, but I'm glad that you originally
> did it. There are other ways of doing these and other tasks that I
> usually prefer (DLL, COM DLL, etc.). But it is kind of like having a
> carpenter having a hand plane in his toolbox. Power tools are better,
> but on the rare occasion when a hand plane can be used, you are glad
> that it is handy and that you have it.
> > >
> > > -- BruceR
> > >
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@>
> wrote:
> > > >
> > > > I should add that embedding JScript/_vbscript_ in formula is old
> technology and was intended
> > > > as a way to support looping in very old and dark ages when there
> was no native looping in
> > > > AFL. Now AFL allows everything that JScript/_vbscript_ and more
> plus it is 10x faster
> > > > and there is absolutely NO reason to use JScript/_vbscript_
> anymore. It is left here ONLY
> > > > to allow run legacy formulas.
> > > > No new code should use JScript/_vbscript_.
> > > >
> > > > Second thing is that OLE AUTOMATION is intended to be used only
> FROM OUTSIDE
> > > > of AmiBroker. Using it within formulas from inside AB, may
> inevitably lead to "chicken and egg" (circular reference) problem
> > > > and is not supported.
> > > > It is important that OLE automation was always thought by
> Microsoft as a method of controlling ONE application
> > > > from ANOTHER application.
> > > >
> > > > Best regards,
> > > > Tomasz Janeczko
> > > > amibroker.com
> > > > ----- Original Message -----
> > > > From: Tomasz Janeczko
> > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > Sent: Tuesday, May 12, 2009 9:41 AM
> > > > Subject: Re: [amibroker] Re: How to pass variables from AFL to
> embedded JScript?
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Hello,
> > > >
> > > > No you are not allowed to run scripting host code within
> conditional _expression_.
> > > >
> > > > The Microsoft SCRIPTING host is INDEPENDENT, i.e. it executes on
> its own,
> > > > in parallel and its "global" parts are simply extracted from the
> formula and run unconditionally
> > > > before actual AFL execution.
> > > >
> > > > If you need to call something in script conditionally you have
> two choices:
> > > > a) either write condition in JScript/_vbscript_
> > > > OR
> > > > b) write a FUNCTION in JScript/_vbscript_ and call that function
> conditionally from AFL level
> > > > as shown below:
> > > >
> > > >
> > > > EnableScript( "jscript" );
> > > > <%
> > > > // NO global code, only function definition
> > > >
> > > > function DoTheJob()
> > > > {
> > > > AB = new ActiveXObject( "Broker.Application" );
> > > > AA = AB.Analysis;
> > > > }
> > > >
> > > > %>
> > > >
> > > > Test = 4;
> > > > if( Test == 4 )
> > > > {
> > > > scr = GetScriptObject();
> > > > scr.DoTheJob();
> > > > }
> > > >
> > > > Best regards,
> > > > Tomasz Janeczko
> > > > amibroker.com
> > > > ----- Original Message -----
> > > > From: ozzyapeman
> > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > Sent: Tuesday, May 12, 2009 7:36 AM
> > > > Subject: [amibroker] Re: How to pass variables from AFL to
> embedded JScript?
> > > >
> > > >
> > > > Okay, this is bizarre. I am testing out some embedded JScript
> for a related application to what I posted earlier. This one is not
> happening within the AA, but is nonetheless still inside an AFL.
> > > >
> > > > The following simple code is fine, and does not generate a
> syntax error:
> > > >
> > > > //Test = 4;
> > > >
> > > > //if ( Test == 4 )
> > > > //{
> > > >
> > > > EnableScript( "jscript" );
> > > > <%
> > > >
> > > > AB = new ActiveXObject( "Broker.Application" );
> > > > AA = AB.Analysis;
> > > >
> > > > %>
> > > >
> > > > //}
> > > >
> > > >
> > > > However, if I uncomment all the "//" I get a syntax error.
> > > >
> > > > Are we not allowed to call a JScript inside an IF block? If not,
> why the heck not? And if we are allowed, why would it be generating a
> syntax error in this simple case?
> > > >
> > > > The error I get is on the "<%" --> probably missing semi colon
> on previous line.
> > > >
> > > > But the semi colon is clearly there.
> > > >
> > > > Anyone's two cents appreciated.
> > > >
> > > >
> > > >
> > > > --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" zoopfree@ wrote:
> > > > >
> > > > > Thanks for that tip.
> > > > >
> > > > > Guess I will have to write a WF type routine in JScript and
> call each optimize individually, from outside AA.
> > > > >
> > > > >
> > > > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" groups@
> wrote:
> > > > > >
> > > > > > During any AA operation in progress, you must not
> > > > > > use Analysis object to start another AA operation
> > > > > > (because it is infinite nesting)
> > > > > >
> > > > > > Analysis object may only be used from OUTSIDE
> > > > > > of AA.
> > > > > >
> > > > > > To run "suboptimization" use THE ONLY supported
> > > > > > way, i.e. Optimizer API (see optimizer.html file in the ADK
> subfolder).
> > > > > >
> > > > > > Best regards,
> > > > > > Tomasz Janeczko
> > > > > > amibroker.com
> > > > > > ----- Original Message -----
> > > > > > From: "ozzyapeman" zoopfree@
> > > > > > To: amibroker@xxxxxxxxxxxxxxx
> > > > > > Sent: Tuesday, May 12, 2009 3:11 AM
> > > > > > Subject: [amibroker] Re: How to pass variables from AFL to
> embedded JScript?
> > > > > >
> > > > > >
> > > > > > > And if there is no way to pass variables directly from AFL
> to JScript,
> > > > > > > can I first fput the AFL vars to some kind of log file,
> and then is
> > > > > > > there a command in JScript that can pull those vars to use
> for the
> > > > > > > Dates?
> > > > > > >
> > > > > > > I can also use _vbscript_, if that makes any difference. I'm
> just not all
> > > > > > > that knowledgeable about either J or _vbscript_s.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@>
> wrote:
> > > > > > >>
> > > > > > >> Hello, hoping someone can help out here. During a
> Walk-Forward test, I
> > > > > > >> am trying to pass From and To dates from the WF engine
> into an
> > > > > > > embedded
> > > > > > >> JScript. I essentially want to do a "sub-optimization" as
> part of the
> > > > > > >> backtest portion of the WF test. However, it seems that I
> cannot pass
> > > > > > >> variables from the AFL to the JScript.
> > > > > > >>
> > > > > > >> Is there any way to pass the From and To dates into the
> JScript? Below
> > > > > > >> is what I have. It generates an 'undefined source' error
> for these
> > > > > > >> lines:
> > > > > > >>
> > > > > > >>
> > > > > > >> AA.RangeFromDate = FromDateStr;
> > > > > > >> AA.RangeToDate = ToDateStr;
> > > > > > >>
> > > > > > >>
> > > > > > >> Here is the AFL with embedded JScript:
> > > > > > >>
> > > > > > >> FromDateNum = Status( "rangefromdate" );
> > > > > > >> ToDateNum = Status( "rangetodate" );
> > > > > > >>
> > > > > > >> FromDate = DateTimeConvert( 2, FromDateNum );
> > > > > > >> ToDate = DateTimeConvert( 2, ToDateNum );
> > > > > > >>
> > > > > > >> FromDateStr = DateTimeToStr( FromDate );
> > > > > > >> ToDateStr = DateTimeToStr( ToDate );
> > > > > > >>
> > > > > > >>
> > > > > > >> EnableScript( "jscript" );
> > > > > > >> <%
> > > > > > >>
> > > > > > >> Formula = "F:\\SomeFormula.afl";
> > > > > > >> Database = "F:\\AB Databases\\MyIB";
> > > > > > >> Settings = "F:\\Some Settings.ABS";
> > > > > > >>
> > > > > > >> AB = new ActiveXObject( "Broker.Application" );
> > > > > > >> AA = AB.Analysis;
> > > > > > >>
> > > > > > >> AB.LoadDatabase( Database );
> > > > > > >> AB.ActiveDocument.Name = "EURUSD";
> > > > > > >> AA.LoadFormula( Formula );
> > > > > > >> AA.LoadSettings( Settings);
> > > > > > >> AA.ApplyTo = 1;
> > > > > > >> AA.RangeMode = 3;
> > > > > > >> AA.RangeFromDate = FromDateStr; // * ERROR *
> > > > > > >> AA.RangeToDate = ToDateStr;
> > > > > > >> AA.Optimize( 0 );
> > > > > > >>
> > > > > > >> AA.Export ( "F:\\TestReport1.html" );
> > > > > > >>
> > > > > > >> %>
> > > > > > >>
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ------------------------------------
> > > > > > >
> > > > > > > **** IMPORTANT PLEASE READ ****
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> > > > > > > This is *NOT* technical support channel.
> > > > > > >
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> > > > > > > SUPPORT {at} amibroker.com
> > > > > > >
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> > > > > > > http://www.amibroker.com/feedback/
> > > > > > > (submissions sent via other channels won't be considered)
> > > > > > >
> > > > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check
> DEVLOG:
> > > > > > > http://www.amibroker.com/devlog/
> > > > > > >
> > > > > > > Yahoo! Groups Links
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>

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- Re: [amibroker] Re: How to pass variables from AFL to embedded JScript?
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  - From: ozzyapeman

References:
- [amibroker] Re: How to pass variables from AFL to embedded JScript?
  - From: ozzyapeman

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