AQ callback not called in some environments

Question

Hi,
I've got a client program that subscribes to a queue, and registers a callback that is called whenever a message is enqueued. This works fine on most computers, but on some computers this callback is never called. I've run it both in debug and release, and the breakpoint in the callback is never hit. On most computer thought, this works all the time.
This is how I register the callback:
sub = new Subscription(env);
sub->setSubscriptionNamespace(oracle::occi::aq::Subscription::NS_AQ);
sub->setProtocol(oracle::occi::aq::Subscription::PROTO_CBK);
sub->setCallbackContext((void *)this);
sub->setSubscriptionName(queue_name + ":" + config["subscribername"]);
sub->setPresentation(oracle::occi::aq::Subscription::PRES_DEFAULT);
sub->setNotifyCallback(&messagequeueclient_occi::event_message);
subs.push_back(*sub);
conn->registerSubscriptions(subs);
both subs and sub are class variables, and the callback look like this:
static unsigned int event_message(
oracle::occi::aq::Subscription &sub,
oracle::occi::aq::NotifyResult *nr
I've tried to examine the difference between the machines, but they all sem to have the same oracle client version etc...
Any tip would be greatly appreciated.
Regards,
Sverre

Answer 1

Thanks, once again. Sorry for my naive questions, but I'm unable to find a good example for this...
After registering the Subscriber, and creating the environment in EVENT mode, it seems like it is picking up the message. Once I send a AQ message, I get an error from visual studio, telling me the variable ESP was not properly saved across a function call. At least it reacts now :)
Could it be that I'm doing something wrong when defining or hooking my callback function? The breakpoint in the callback function is never called....
my registering routine now looks like this:
void aq_connection::create_callback() {
payload = new Bytes(env); //is this the correct way?
Subscription sub(env);
sub.setSubscriptionNamespace(oracle::occi::aq::Subscription::NS_AQ);
sub.setProtocol(oracle::occi::aq::Subscription::PROTO_CBK);
sub.setPayload(*payload);
sub.setCallbackContext((void *)this);
sub.setSubscriptionName(quename + ":" + config->subscribername);
sub.setPresentation(oracle::occi::aq::Subscription::PRES_DEFAULT);
sub.setNotifyCallback(&aq_connection::event_message);
subs.push_back(sub);
conn->registerSubscriptions(subs);
I thought it was ok to create a local Subscription instance, as I put it into the global subs-vector.
Thanks in advance,
Sverre