无法打开UDP套接字

Question

I'm trying to create a UDP socket with boost to send and receive data. Here's the relevant code:

// Create IO service
mIoService = std::make_unique<boost::asio::io_service>();

// Create local endpoint on random port
mLocalEndpoint = std::make_unique<udp::endpoint>(udp::v4(), 0);

// Create socket
mSocket = std::make_unique<udp::socket>(*mIoService, *mLocalEndpoint);
mSocket->open(mLocalEndpoint->protocol());

This gives me the following exception:

open: Already open

I have fiddled around with this code for quite some time now, but the result stays the same. What am I missing here?

Answer 1

It looks like you try to create a UDP end point on port 0 . I'd assume that it may be already used, so you can try to change a port:

mLocalEndpoint = std::make_unique<udp::endpoint>(udp::v4(), 40000);