Oh, I see. No, CodedOutputStream doesn't support seek functionality, so I guess you'd have to go with b). Just make sure that you're using WriteLittleEndian64 and not WriteVarint64.
On Sat, Nov 14, 2009 at 12:05 PM, Fishtank <saptarshi.g...@gmail.com> wrote: > > That's because I don't know the size of data1(and it is not from > protobuf parse) > I'm using protobuf for the stream libraries. > I can either a) loop through the calculation to get the total data > size, then loop again writing size and data > or b) loop once, write, get size, seek and adjust size. > > Regards > sapsi > > > On Nov 14, 2:56 pm, Jason Hsueh <jas...@google.com> wrote: > > Why can't you write the actual size of data rather than a 0? Just use the > > ByteSize() method to find out how much data will be written for a > protocol > > buffer. > > > > On Sat, Nov 14, 2009 at 11:39 AM, Fishtank <saptarshi.g...@gmail.com> > wrote: > > > > > Hello, > > > I'm using the following idiom > > > ZeroCopyOutputStream* raw_output = new FileOutputStream(fd); > > > CodedOutputStream* coded_output = new CodedOutputStream(raw_output); > > > > > The format i'd like is uint64_t, followed by data1, followed by data2. > > > I write a 0 for the uint64_t, write the data1, record the bytes written > > > (B), then write data2. > > > I'd like to seek to the beginning of the file and change the uint64_t > > > val (which was 0 ) to B. > > > (data2 is updated much more frequently than data1) > > > > > It appears codedoutputstream doesn't have a seek, so I'm thinking , > > > after the above steps > > > a) deleting the CodedOutputStream and Zero... > > > b) seek on the fd, and update the value. > > > > > Does this sound right? > > > Regards > > > Sapsi > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
