User guide

VTB USER GUIDE

6.3 Pointers

VTB is able to manage the pointers to variables too. Pointers defines the address of allocation memory of the variables,

not its content. Some VTB functions need of pointers as parameter particularly when the function manage arrays or

strings. To define the address of a variable it's enough insert the postfix () except for the funcions.

Example:

var as long

array(20) as uint

var() ‘refers to the address of variable var

array() ‘refers to the address of the first element of array

Pointers can be declared only to following types:

Char, Uchar, Int, Uint, Long, Float, Functions

Declaring of a pointer

To assign an address to the pointer it's need:

refer to the name of pointer (without brakes)

assign the desired address to pointer

To assign the value to a pointed field it's need:

refer to the pointer with square brackets

put the right index inside the brackets

assign the value

Examples

Used variables:

pnt as *long

val as long

pointer as *uint

array(10) as uint

var as long

Writing/reading variables by pointer:

pnt=val() 'assign to pnt the address of variable val

pnt[0]=2000 ’ pnt[0] points to variable val which will take the value 2000

var=punt[0] 'assign to var the content of val by the pointer pnt

Writing/reading array by pointer:

pointer=array() ‘assign to pointer the address of array

pointer[0]=13

pointer[1]=27

pointer[9]=55 ‘ assign to array some value by pointer

var=pointer[7] ‘ assign to var the content of array[7]