I have the following. PacketHandlerClass (Active) <-> SerialPortClass (Active)<-> Serial Bus (hardware).

The SerialPortClass sends and receives messages from the serial port. Once it receives a message I want it to send it to the PacketHandlerClass. The messages are 8 bytes long and come every 100 ms. I made a union/struct to represent the message. So then I pass the struct object to the PacketHandlerClass over an Event. However, it appears that the object is getting overwritten. So I believe the problem is that the message object is on the stack and the event only copies the address of the object and not the values. Then when a new message arrives, it overwrites the data on the message.

Does that make sense? I am going to try to create the message object on the heap now, but I just want to make sure there aren't any other pitfalls.

Hi,
In this case, simply create the event data on the heap and pass a pointer to the receiver who then owns the allocated event data (and needs to delete it).

BR//
LGJ

How do I make an event take a pointer argument? I can't chose In/Inout/Out. Do I have to uncheck use existing type? That makes me feel uncomfortable about whether I am doing the right thing.

Hi,
Simply decheck the "Use existing type" box in the argument dialog of the event and write the type of the argument (with a * or a &) explicit instead of using the "in"/"out" options. This will require that you add a "usage" dependency to the event data type to the context of the event (i.e the package that contains the event).

BR//
LGJ