Brightsign BrightScript 2 Reference Guide Manuel d'utilisateur Page 23
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
23
Creating and Using Intrinsic Objects
In most of this manual we use the term “object” to refer to a “Roku Object”. These are C
or C++ components with interfaces and member functions that BrightScript uses directly.
Other than a few core objects that BrightScript relies upon (roArray, roAssociativeArray,
roInt, etc.) Roku Objects are platform specific.
You can create “intrinsic” objects in BrightScript itself to use in your scripts. However,
to be clear, these are not Roku Objects. There is currently no way to create a Roku
Object in BrightScript, or to create intrinsic objects that have interfaces (they only
contain member functions, properties, or other objects).
A BrightScript object is built upon an Associative Array. In fact, it is an
roAssociativeArray. When a member function is called “from” an AssociativeArray, a
“this” pointer is set. The “this” pointer is “m”. “m” is accessible inside the FUNCTION
code to access object keys.
A “constructor” in BrightScript is a normal function at global scope that creates the
AssociativeArray and fills in its member functions and properties. There is nothing
“special” about it.
For an example, see the “snake” game at the end of this manual.
- Table of Contents 2
- Introduction 5
- Statement Summary 6
- Identifiers 7
- Literals (Constants) 8
- Type Declaration Characters 10
- Type Conversion (Promotion) 10
- Operators 11
- String Operators 11
- Function References 11
- “dot” Operator 12
- Array/Function Call Operator 12
- = Operator 13
- BrightScript XML Support 16
- Garbage Collection 19
- Threading Model 21
- Program Statements 24
- GOTO label 25
- RETURN expression 25
- FOR EACH item IN object 26
- For example: 28
- Examples: 29
- Print “this is a five “5”!!” 29
- Anonymous Functions 32
- Built-In Functions 33
- Global Functions 35
- Global String Functions 38
- Global Math Functions 40
- Sgn(x As Float) As Integer 41
- Sgn(x As Integer) As Integer 41
- Sin(x As Float) As Float 41
- Sqr(x As Float) As Float 41
- Tan(x As Float) As Float 41
- Core Roku Objects 42
- Reserved Words 59
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