You can only have one CodedInputStream wrapping a ZeroCopyInputStream at a
time, otherwise they will confuse each other with buffering conflicts.
CodedInputStreams are cheap to construct, so you can just make one on the
stack in a block, like:
{
CodedInputStream coded_input(input_stream_p.get());
success = coded_input.ReadLittleEndian64(&size);
}
On Tue, Dec 21, 2010 at 6:56 AM, rodrigo benenson <
rodrigo.benen...@gmail.com> wrote:
> Hello all !
> I am trying to save multiple Protocol Buffer messages into a file and then
> reading them back.
> All messages (except the first) have the same type.
>
> My code now works. But I had to use a workaround instead. The code looks as
> follows.
>
> boost::uint64_t size;
> const bool read_size_success =
> input_coded_stream_p->ReadLittleEndian64(&size);
>
> bool read_data_success = false;
>
> const bool use_zero_copy_stream = false;
> if(use_zero_copy_stream)
> {
> read_data_success =
>
> data.ParseFromBoundedZeroCopyStream(input_stream_p.get(),
> static_cast<int>(size));
> }
> else
> { // work around
> std::string buffer;
> input_coded_stream_p->ReadString(&buffer, size);
> read_data_success = data.ParseFromString(buffer);
> }
>
> if (read_size_success == false or read_data_success == false)
> {
> throw std::runtime_error("Failed to read a data message during
> DataSequence<DataType>::read");
> }
>
>
> The code above works fine when using use_zero_copy_stream == falsehowever
> when I set
> use_zero_copy_stream to true then the read fails (read_data_success ==
> false).
>
> Obviously input_coded_stream_p was constructed using input_stream_p.
>
> Why is ParseFromBoundedZeroCopyStream not working as expected ? What is
> the proper way of using it ?
>
> Thanks for your answers.
> Best regards,
> rodrigob.
>
>
>
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