如何在 omnet++ 中发送变量数据？

Question

I´m trying to send a variable data in the omnet++, but it can only send a constant data.

cMessage *msg=new cMessage(const char *s);

For example, how can I implement the following code?

data++;
cMessage *msg=new cMessage(""+data);
send(msg, "out");

Answer 1

Using the name of message to carry data is not a good idea.
The better way is to define own message with required fields. For example this way:

1. Create a new message file (for example DataMessage.msg ) with the content:

    message DataMessage { int data; // here one can add other fields }

2. Add in your C++ code:

    #include "DataMessage_m.h"

3. To create, set the field and send a new message use this sample code:

    DataMessage *msg = new DataMessage("DataMsg"); msg->setData(data); send(msg, "out");

Answer 2

Since data is an integer, all that is necessary is to convert it to a string. The easiest way to do this in C++ is to use std::stringstream :

std::stringstream ss;
ss << data;

Now ss.str().c_str() is of type const char * , which is accepted in cMessage 's constructor.

Answer 3

You just need to convert int type to string type and get C string from C++ string.

int data{};
cMessage *msg=new cMessage(std::to_string(data).c_str());