I think it's being buffered in the FileOutputStream -- you should be sure to
delete the output streams (in the reverse order that you created them)
before you close the file.

On Mon, Oct 11, 2010 at 1:07 PM, Paul Yang <mjpabl...@gmail.com> wrote:

> Hi,
> I am new to protocol buffers, and I am trying to serialize a message
> to a file.  I need to serialize the file so that in can be opened in
> Java using parseDelimitedFrom().  However, when I write to the file
> using SerializeToCodedStream or SerializeWithCachedSizes, nothing
> happens to the serializedMessage.bin file, and it stays at 0 bytes.
> Why is nothing being written to the file?  I have attached the code
> below:
>
> int fd = open("serializedMessage.bin", O_WRONLY);
>
> google::protobuf::io::ZeroCopyOutputStream* fileOutput = new
> google::protobuf::io::FileOutputStream(fd);
>
> google::protobuf::io::CodedOutputStream* codedOutput = new
> google::protobuf::io::CodedOutputStream(fileOutput);
>
> codedOutput->WriteVarint32(message1.ByteSize());
> message1.SerializeToCodedStream(codedOutput);
> // also tried snap1.SerializeWithCachedSizes(codedOutput)
>
> close(fd);
>
> Thanks!
>
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