On 8/04/2020 12:35, Jupiter wrote:

I am doing boost local unix domain for IPC, I midified the code based on sample code from boost_asio/example/local/stream_server.cpp, I am a little bit puzzled for errors calling different async_read, if I call original code using shared_from_this() it works fine:

boost::asio::async_read(this->mSocket, boost::asio::buffer(this->mData), boost::bind(&session::HandleRead, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));

But if I tried to run a following lambda function which works in in my other boost asio TCP socket, it got an error "Operation canceled", what I could be missing here? Or do I have fundamontal problems in the lambda function I used for other TCP socket programs?

boost::asio::async_read(this->mSocket, boost::asio::buffer(this->mData, sizeof(this->mData)), [=](const boost::system::error_code &status, const uint32_t size) {this->HandleRead(status, size);});

Your lambda isn't capturing a shared_ptr, thus if nothing else is keeping the session object alive, it's probably being destroyed (and cancelling the read -- though probably then also calling HandleRead after destruction, which is bad). You should use something like this instead: [self=shared_from_this()](boost::system::error_code status, size_t size) { self->HandleRead(status, size); }