[Click] info about HandlerCall::call_read()

[Cliff Frey]

You can look at the HandlerCall interface if you really want to use
read-handlers.

Often in cases like this, it is easier to actually pass a pointer from one
element to another through the config.  ARPQuerier can do this with
ARPTable, or etherswitch/spantree.cc does this as well.  Search for
ElementCastArg in the source.

Cliff

On Tue, Oct 11, 2011 at 7:54 AM, Xavier Salip <saverione09 at gmail.com> wrote:

> Hi list,
>
> I have created an element called WC.
> In a configuration .click file i have a bank of 5 WC elements (WC1,
> WC2...WC5),  each one of them with a read handler called "energy".
> I would like to create a control element CONTROL which reads the handler
> "energy" on the desired WC and make some calculations with it.
> I'm trying with this function to call the handler, but i don't manage to
> find how to use it in a correct way:
>
> String <http://www.read.cs.ucla.edu/click/doxygen/class_string.html
> >HandlerCall::call_read
> ( Element <http://www.read.cs.ucla.edu/click/doxygen/class_element.html> *
> *e*,
>
> const String <http://www.read.cs.ucla.edu/click/doxygen/class_string.html
> >&
> *hname*,
>
> ErrorHandler<
> http://www.read.cs.ucla.edu/click/doxygen/class_error_handler.html>*
> *errh* = 0
> )
>
> Any ideas or suggestions?
>
> Thanks!
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