[AGENT++] C++ function within snmp++ callback

[Jochen Katz]

Hi,

> I have my callback for an asynchronous get mechanism declared as extern
> "C" as demanded.

who demands the "extern "C""? It just has to be a C function, not a
function within a class.

> oid/value in other classes. Is there a possibility to call a class
> member function or just emit a signal from within the extern "C" callback?

In the QtExample I used the data pointer param and the callback function
just casts it to a class and calls the member function.

/// C Callback function for snmp++
void callback(int reason, Snmp *snmp, Pdu &pdu, SnmpTarget &target,
              void *cd)
{
  if (cd)
  {
    // just call the real callback member function...
    ((MainWindow*)cd)->async_callback(reason, snmp, pdu, target);
  }
}

Regards,
  Jochen