Language Elements
35
NetLinx Programming Language Reference Guide
MEDIUM_WHILE (<conditional expression>)
{
(* conditional statements *)
}
LONG_WHILE statements
A LONG_WHILE differs from a WHILE statement in the way input change notifications are processed
during the programming loop. The system checks the input queue for a change notification message
before execution of each loop, beginning with the second loop. The message is retrieved if one exists.
This message must be processed before another one is retrieved, either at the start of the next loop or the
beginning of the next mainline iteration. Otherwise, the message is lost. For example:
LONG_WHILE (<conditional expression>)
{
(* conditional statements *)
}
DEFINE_EVENT events are still processed even if mainline is in a LONG_WHILE.
FOR loop structure
The FOR loop structure allows you to define initialization statements; statements to execute after each
pass through the loop and a condition to test after each pass. If the condition evaluates to true, another
pass is made. Otherwise, the loop is terminated. The syntax of the
FOR loop is as follows:
FOR (<INITIAL>; <condition>; <after pass>)
{
(* loop statements *)
}
Parameters:
LONG_WHILE should not be used in Events. It may cause unexpected results.
<INITIAL> One or more statements that are executed one time before any FOR loop state-
ments are executed. Each statement must be separated with a comma; this is
typically a FOR loop index initialization statement.
<condition> A condition whose value is computed before each pass. If the condition evalu-
ates to TRUE, the FOR loop statements are executed. If the condition evaluates
to FALSE, the loop is terminated.
<after pass> One or more statements that are executed after each pass through the state-
ments. Each statement must be separated with a comma. This is typically a
statement that increments the FOR loop index.
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