Ulrich,
U have to use static functions if using C++. The function prototypes of c
functions and static c++ functions are the same; however, the prototypes of c++
method functions are different (the actual class becomes part of the signature
or something like that). So it gets a bit tricky because anything that the
static functions access have to be static as well. I ended up creating c++
classes whose members were all static. So why not just use C? Although you
lose most of the OOA/OOD concepts we enjoy, you keep scope with namespaces.
I'm sure there are other reasons...
Here is an example header file and init function...
#ifndef MyDataHandler_H
#define MyDataHandler_H
#include "net-snmp/net-snmp-config.h"
#include "net-snmp/net-snmp-includes.h"
#include "net-snmp/agent/net-snmp-agent-includes.h"
class MyDataHandler{
public :
// Destructor
~MyDataHandler();
static void init();
static int handleAttribute1(
netsnmp_mib_handler* handler,
netsnmp_handler_registration* reginfo,
netsnmp_agent_request_info* reqinfo,
netsnmp_request_info* requests);
static int handleAttribute1(
netsnmp_mib_handler* handler,
netsnmp_handler_registration* reginfo,
netsnmp_agent_request_info* reqinfo,
netsnmp_request_info* requests);
private :
// Constructor
MyDataHandler
static MyData myData;
};
#endif // MyDataHandler_H
void MyDataHandler::init() {
static oid attribute1_oid[] = { 1,3,6,1,4,1,#,1 };
static oid attribute2_oid[] = { 1,3,6,1,4,1,#,2 };
DEBUGMSGTL(("myData", "Initializing\n"));
netsnmp_register_scalar(
netsnmp_create_handler_registration(
"attribute1",
MyDataHandler::handleAttribute1,
attribute1_oid,
OID_LENGTH(attribute1_oid),
HANDLER_CAN_RWRITE
));
netsnmp_register_scalar(
netsnmp_create_handler_registration(
"attribute2",
MyDataHandler::handleAttribute2,
attribute2_oid,
OID_LENGTH(attribute2_oid),
HANDLER_CAN_RWRITE
));
}
You pass the MyDataHandler::init() function when you register your sub agent.
I have a handler for each data type and a sub agent singleton that handles the
registering of the individual mib handlers.
Hope this helps.
> Subject: Passing methods as handlers?
> Date: Thu, 29 Oct 2009 11:41:42 +0100
> From: ulrich.schmidt-goe...@plath.de
> To: net-snmp-users@lists.sourceforge.net
>
> Hi,
>
> I am trying to add agent functionality to my program. Since I use OOP,
> I'd like to make the handlers methods of my agent class. However, so far
> my attempts have met the following error (on the line where I do
> netsnmp_register_scalar()):
>
> argument of type 'int (SnmpAgent::)(netsnmp_mib_handler*,
> netsnmp_handler_registration*, netsnmp_agent_request_info*,
> netsnmp_request_info*)' does not match 'int (*)(netsnmp_mib_handler*,
> netsnmp_handler_registration*, netsnmp_agent_request_info*,
> netsnmp_request_info*)'
>
> SnmpAgent is my own class. The handlers themselves and the
> netsnmp_register_scalar() invocations are just as mib2c generated them
> (with concrete data inserted, of course.)
>
> Is there any way to make this work?
>
> Best regards,
> Ulrich
>
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