GigE Vision Events C++

Programming Questions C++ API
,
2

Figured out why it didn’t jump into the callback.

The timestamp node itself wasn’t accessable when trying to register the callback. Seems like I have to acquire an initial image by adding the GetSnapshot() function in order to get access to the node. This way I’m able to do the registration of the node and my code works.

    // get node map
    auto devideNodeMap = device->NodeMap(CVB_LIT("Device"));
    
    // get the first stream of the device
    auto stream = device->Stream();

    // get node
    auto nodeEventAcqStart = devideNodeMap->Node<Cvb::IntegerNode>(CVB_LIT("EventAcquisitionStartTimestamp"));

    // get initial snapshot (required for access to timestamp node!)
    stream->GetSnapshot();

    // register node callback
    auto cookie = nodeEventAcqStart->RegisterEventUpdated([&](Cvb::Node*)
    {
      std::cout << "Acq Start Timestamp changed: "<<nodeEventAcqStart->Value()<<std::endl;
      // do processing
    });

    // start the stream - start the acquisition
    stream->Start();
2 Likes