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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;
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.
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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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