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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: Tue, 12 May 2009 16:06:52 +0200

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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 -

Manipulation of COM arrays that allows a very fast way to get AFL arrays into and out of Excel.

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.
Getting lists of files and directories.
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@xxx> 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 ****
> > > > This group is for the discussion between users only.
> > > > This is *NOT* technical support channel.
> > > >
> > > > TO GET TECHNICAL SUPPORT send an e-mail directly to
> > > > SUPPORT {at} amibroker.com
> > > >
> > > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> > > > 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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**** IMPORTANT PLEASE READ **** This group is for the discussion between users only. This is *NOT* technical support channel. TO GET TECHNICAL SUPPORT send an e-mail directly to SUPPORT {at} amibroker.com TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at 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/

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

References:
- [amibroker] Re: How to pass variables from AFL to embedded JScript?
  - From: bruce1r

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