#web_update

Rabbit
1

I have a bizarre problem… adding a #web_update directive causes my program to not compile.

I’m trying to create a web interface to change some system parameters, including the RTC and some controller setpoints.

The code structure is as follows:


// Function prototypes, including functions I want to use as callbacks

// MIMETABLE

// RESOURCETABLE

// Global variables needed for the web

// #web directives including web guards

// #web_update directives

// function definitions

// main()

if I leave out the web directives, everything compiles and runs fine - save for the few bugs that I could solve with callback functions

As soon as I add the #web_update line, using the same format as in the web_update example, I get these errors:


line  458 : ERROR ATMOSV0_4_RWEB.C   : Need function definition or declaration.
line  458 : ERROR ATMOSV0_4_RWEB.C   : Syntax error - or garbage at end of program.

What is going on? Are there any unwritten rules about web_update functions? I’m not trying to pass arguments, nor are my variables anything but simple.

I’ll post more code if it helps - but it’s too large to post at this point.

2

Hi

Try to change the order of declaration and definitions like

// Global variables needed for the web

// Function prototypes, including functions I want to use as callbacks

// #web directives including web guards

// #web_update directives

// #ximport line if ur importin any html or zhtml pages

// MIMETABLE

// RESOURCETABLE

probably this will work

reards
Aby

3

Abhilash,
Thanks for your response.
I think I found the cause of the problem. Here’s the documentation snippet from http://www.rabbit.com/documentation/docs/modules/RabbitWeb/

#web_update bar user_callback()
#web_update bar.a differentuser_callback()

If bar.b is updated, user_callback() is called, but if bar.a is updated, the function differentuser_callback() is called and not user_callback().

(Emphasis added)

The example code does not use the () after the callback function… here’s the web_update example from the TCPIP samples


// Each of the ports[] array elements gets its own #web_update statement so that
// we can call different update functions for each element.
#web_update ports[0] port0_update
#web_update ports[1] port1_update
#web_update ports[2] port2_update

That was the problem. Simple enough fix…

Cheers,
KB