Language Elements
55
NetLinx Programming Language Reference Guide
Structures
A structure provides the ability to create a new data type composed of other data types arranged in a
specified order.
Here's an example:
DEFINE_TYPE
STRUCTURE NEWSTRUCT
{
INTEGER Number
CHAR Text[20]
}
In the example above, a structure named NEWSTRUCT is declared to contain two data types, a 16-bit
number and a 20-character array. Once declared, a structure may be used in the same way as any other
data type. Here is a syntax sample:
DEFINE_VARIABLE
NEWSTRUCT MyNewStruct
NEWSTRUCT MyNewStructArray[3]
Structures can be initialized using set notation as in the two examples below. Notice that the members of
each structure, as well as, the entire array are enclosed in braces.
MyNewStruct.Number = 0
MyNewStruct.Text= 'Copyright by Company X'
MyNewStructArray[1].Number = 1
MyNewStructArray[1].Text = 'Line 1'
MyNewStructArray[2].Number = 2
MyNewStructArray[2].Text = 'Line 2'
MyNewStructArray[3].Number = 3
MyNewStructArray[3].Text = 'Line 3'
Structure members are referenced using dot-operator syntax as shown below:
MyNewStruct.Number = 0
MyNewStructArray[1].Number = 20
SET_LENGTH_STRING (MyNewStruct.Text, 16)
A syntax sample for a structure definition is shown below:
STRUCTURE <name>
{
[<type>] <Data1>
[<type>] <Data2>
[<type>] <DataN>
}
The attributes VOLATILE, PERSISTENT, and CONSTANT do not apply to the individual members of a
structure.
A structure is declared in the DEFINE_TYPE section of the program.
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