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--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> Hello,
>
> I received the following two questions by support channel
> and thought that reply may interest more people:
>
> Q1. What is the difference between StaticSetVar("x",5); and
x=5;
>
Tomasz,
I suppose you mean StaticVarSet("x",5).
Dimitris Tsokakis
> A1: Read me says:
> ** Static variable - the variable has static duration (it is
allocated when the program begins and deallocated when the program
> ends)
> and initializes it to Null unless another value is specified.
Static variables allow to share values between various formulas.
> Only NUMBER and STRING static variables are supported now (not
ARRAYS).
>
> So, speaking about the difference
> x=5; is regular variable that "lives" only DURING execution of the
formula.
>
> StaticSetVar("x",5);
> - gives you an access to static data storage that REMAINS between
execution of formulas (as long AmiBroker is running)
> and is accessible from ANY formula.
> You can call StaticGetVar("x") from a DIFFERENT formula and you
will get the value set from another formula.
>
> So Static variables are BOTH persistent (as long as AmiBroker is
running) and global (in "wider" scope - between different formulas)
>
> Static variables can be used instead of external files to store
values between formula invocations.
>
>
> -----------
> Q2. Can I access vars that are defined in a DLL by using
StaticVarGet?
>
> A2: Only if you create them using StaticVarSet.
> (You can call StaticVarSet from DLL using gSite.CallFunction)
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
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