Hey, I have run into one more problem.
Whenever I try to find out the number of bytes written by the streams, CodedOutputStream.ByteSize() gives the right answer but ZeroCopyOutputStream.ByteSize() always gives 0 and GzipOutputStream always gives a fixed no. like 63356 and not the actual no. of bytes written by the stream. I would really appreciate the help. Thanks On Dec 1, 3:10 pm, Vinay Bansal <[email protected]> wrote: > Hey Oliver, > > I figured it out just a minutes before your reply. > > Thanks anyway > > Cheers, > -Vinay > > On Dec 1, 2:28 pm, Oliver Jowett <[email protected]> wrote: > > > > > > > > > On Thu, Dec 1, 2011 at 3:22 PM, Vinay Bansal <[email protected]> wrote: > > > void write() { > > > int fd = open("myfile", O_WRONLY), O_APPEND); > > > google::protobuf::io::ZeroCopyOutputStream *out = new > > > google::protobuf::io::FileOutputStream(fd); > > > google::protobuf::io::GzipOutputStream *gzipOut = new > > > google::protobuf::io::GzipOutputStream(out, options); > > > google::protobuf::io::CodedOutputStream *codedOut = new > > > google::protobuf::io::CodedOutputStream(gzipOut); > > > codedOut->WriteVarint32(message.ByteSize()); > > > message.SerializeToCodedStream(codedOut); > > > close(fd); > > > } > > > If you're doing that for every (small) message, then the compressor is > > never going to have a good chunk of data to work with; the compression > > dictionary will be reset for every message, plus a gzip header gets > > written each time. (For comparison, try a command-line gzip of a file > > containing only a single message - that's essentially what you're > > doing here) > > > You want to open the file once, create one GzipOutputStream, then > > write many messages to it. > > > Oliver -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
