HMS NETWORKS CANbridge NT Lua ADK Bridge Router User Guide

C Funcons Called from Lua  

CAN@net NT/CANbridge NT Lua ADK  

NOTE  

Array/table indexes in Lua always start with 1(instead of 0as in many other languages).  

Funcon 'array.extract'  

a = array.extract(a, first [, last])  

Returns an extract of athat starts at firstand connues unl last. If lastis absent, then it is assumed to  

be equal to the array length.  

Funcon 'array.insert'  

a = array.insert(a, [pos,] value)  

Inserts element valueat posion posin a, shifing up the elements a[pos]···, a[#a]. The default value for  

posis #a+1, so that a call array.insert(a, x)inserts xat the end of array a.  

Funcon 'array.string_to_array'  

a = array.string_to_array("this is string")  

Converts a Lua string to a byte array. The length of the array corresponds to the number of string characters.  

Funcon 'array.array_to_string'  

s = array.array_to_string(a)  

Converts a byte array to a Lua string. Strings in Lua are not zero-terminated and can contain any arbitrary binary  

data.  

Funcon 'array.compile'  

format = array.compile(s)  

Generates a binary format string for array.repack()based on the given ASCII format string.  

array.repack()allows a re-packaging of data bytes from one array into another. The format string denes  

which bytes are used and how they are packed into the desnaon array.  

Example:  

-- copy 4 bytes to the destination array in opposite order  

format = array.compile("#4,#3,#2,#1")  

dest_array = array.repack(format, src_array)  

-- this corresponds to  

dest_array[1] = src_array[4]  

dest_array[2] = src_array[3]  

dest_array[3] = src_array[2]  

dest_array[4] = src_array[1]  

The format allows constant values in addion:  

4.02.0332.20002 Version 1.5  

Page 17 of 20  

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