Doesn't the UDP packet header effectively provide that length prefix for you? --Chris
On Fri, Sep 18, 2009 at 12:26 PM, jayt0...@gmail.com <jayt0...@gmail.com>wrote: > > One other thing I wanted to say was that I chose to use > CodedOutputStream to send > data because ultimately I have to manually encode a length prefix in > front of my PB message. > With the C++ environment, I understand that this is the only way to do > this (ugh is right; I am sure this is a common problem with using PB > over sockets that remain in use). > I am fully aware that there are methods to serialize directly from the > object but those will not serve my ultimate aim of getting a length > prefix ahead of the data bytes. > > Thanks > > Jay > > On Sep 18, 12:19 pm, "jayt0...@gmail.com" <jayt0...@gmail.com> wrote: > > Hello all, > > > > I am having trouble figuring out how to serialize data over a socket > > utilizing UDP protocol. I am in C++ environment. When writing to the > > socket without protocol buffers, I use the standard sendto() socket > > call which allows me to specify the port and IP address of the > > intended receiver of my UDP message. When trying to send a protocol > > buffers message, this seems to be the recommended strategy on the > > google docs: > > > > ZeroCopyOutputStream* raw_output = new FileOutputStream > > (sock); > > CodedOutputStream* coded_output = new CodedOutputStream > > (raw_output); > > coded_output->WriteRaw(send_data,strlen(send_data)); > > > > There is no way to specify what the port and IP address is here, > > analogous to when using the standard sendto() socket writing call. So > > my message never gets received by the intended recipient on the > > network. I am aware that this is a raw message, not a PB message. > > Getting this raw message over the network is a first step in > > accomplishing the ultimate goal of getting the PB message over the > > network. > > > > Is there a way to get all of the bytes of a serialized PB message into > > raw form and then send them with sendto()? > > > > Any ideas? Thanks for any help. > > > > Jay > > > -- Chris --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/protobuf?hl=en -~----------~----~----~----~------~----~------~--~---
