jsonAddValueNull (Function)

jsonAddValueNull adds a null-value to the end of the given JSON array, growing the size of the array by 1.

Input:

o : SYSHANDLE

A handle to the JSON array to add the null-value to.

Returns: INT

Declaration:

FUNCTION jsonAddValueNull : INT;
VAR_INPUT
   o     : SYSHANDLE;
END_VAR;

Example:

INCLUDE rtcu.inc
 
PROGRAM test;
VAR
   rc  : INT;
   arr : SYSHANDLE;
END_VAR;
 
BEGIN
   ...
   // Create array
   rc := jsonCreateArray(o := arr);
   // Add null-value
   rc := jsonAddValueNull(o := arr);
   ...
END;
 
END_PROGRAM;