Created
September 29, 2020 02:58
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sending-protobuf-messages-with-boostasio
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#include "boost/asio.hpp" | |
#include "google/protobuf/io/coded_stream.h" | |
#include "google/protobuf/io/zero_copy_stream_impl.h" | |
// https://stackoverflow.com/questions/4810026/sending-protobuf-messages-with-boostasio | |
using ::boost::asio::ip::udp; | |
int main() { | |
PlayerInfo message; | |
message.set_name("Player 1"); | |
// ... | |
const boost::asio::ip::address_v4 kIpAddress = boost::asio::ip::address_v4::loopback(); | |
const unsigned short kPortNumber = 65535; | |
try { | |
boost::asio::io_service io_service; | |
udp::socket socket(io_service, boost::asio::ip::udp::v4()); | |
udp::endpoint endpoint(kIpAddress, kPortNumber); | |
boost::system::error_code error; | |
boost::asio::streambuf stream_buffer; | |
std::ostream output_stream(&stream_buffer); | |
{ | |
::google::protobuf::io::OstreamOutputStream raw_output_stream(&output_stream); | |
::google::protobuf::io::CodedOutputStream coded_output_stream(&raw_output_stream); | |
coded_output_stream.WriteVarint32(message.ByteSize()); | |
message.SerializeToCodedStream(&coded_output_stream); | |
// IMPORTANT: In order to flush a CodedOutputStream it has to be deleted, | |
// otherwise a 0 bytes package is send over the wire. | |
} | |
} | |
size_t len = socket.send_to(stream_buffer.data(), endpoint, 0, error); | |
if (error && error != boost::asio::error::message_size) { | |
throw boost::system::system_error(error); | |
} | |
std::cout << "Sent " << len << " bytes data to " << kIpAddress.to_string() << "." << std::endl; | |
} catch (const std::exception& ex) { | |
std::cerr << ex.what() << std::endl; | |
} |
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