[protobuf] Re: Issue 269 in protobuf: Would like to have byte or int8 type for the message definition
Comment #3 on issue 269 by xiaof...@google.com: Would like to have byte or int8 type for the message definition http://code.google.com/p/protobuf/issues/detail?id=269 Re kumar.sumit: How are you going to use the byte field to implement a fixed length string? If byte can, why can't int32? -- You received this message because you are subscribed to the Google Groups Protocol Buffers group. To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+unsubscr...@googlegroups.com. To post to this group, send email to protobuf@googlegroups.com. Visit this group at http://groups.google.com/group/protobuf?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
[protobuf] Compress proto to string
Hello.
I sucesfully compress/decompress a proto object using files, but i now need
to do it same, but using string (no using files).
This code works fine for files:
google::protobuf::io::FileOutputStream file_stream(filedescriptor);
GzipOutputStream::Options options;
options.format = GzipOutputStream::GZIP;
options.compression_level = NIVEL_COMPRESION;
google::protobuf::io::GzipOutputStream gzip_stream(file_stream, options);
I was transformed this code in another to work with string:
const unsigned bufLength = 256;
unsigned char buffer[bufLength];
std::cout buffer std::endl;
// Obtenemos un array del proto serializado
ZeroCopyOutputStream* output = new
google::protobuf::io::ArrayOutputStream(buffer,bufLength);
// Introducimos las opciones de compression
GzipOutputStream::Options options;
options.format = GzipOutputStream::GZIP;
options.compression_level = NIVEL_COMPRESION;
google::protobuf::io::GzipOutputStream gzip_stream(output,options);
if (!pProto.SerializeToZeroCopyStream(gzip_stream))
{
std::cerr Error comprimiendo el proto a string. std::endl;
}
buffer is void. Where can be the error?
Regards.
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[protobuf] Re: Compress proto to string
this does not work :-(
212 // Definimos el buffer al cual vamos a comprimir
213 const unsigned bufLength = 256;
214 unsigned char buffer[bufLength];
215
216 memset(buffer,0,256);
217
218
219 std::cout buffer std::endl;
220
221 // Obtenemos un array del proto serializado
222 google::protobuf::io::ArrayOutputStream
arrayStream(buffer,bufLength);
223
224 // Introducimos las opciones de compression
225 GzipOutputStream::Options options;
226 options.format = GzipOutputStream::GZIP;
227 options.compression_level = NIVEL_COMPRESION;
228
229 google::protobuf::io::GzipOutputStream
gzip_stream(arrayStream);
230 if (!pProto.SerializeToZeroCopyStream(gzip_stream))
231 {
232 std::cerr Error comprimiendo el proto a string.
std::endl;
233 }
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Re: [protobuf] Re: Compress proto to string
On Tue, Jan 29, 2013 at 11:23 AM, David Granados deivi...@gmail.com wrote:
this does not work :-(
That's not really a useful description of the problem.
229 google::protobuf::io::GzipOutputStream
gzip_stream(arrayStream);
230 if (!pProto.SerializeToZeroCopyStream(gzip_stream))
231 {
232 std::cerr Error comprimiendo el proto a string.
std::endl;
233 }
You should call gzip_stream.Flush() or gzip_stream.Close() after this,
before using the results in arrayStream.
Oliver
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Re: [protobuf] Re: Compress proto to string
(Readding the list cc:)
On Tue, Jan 29, 2013 at 4:32 PM, David Granados deivi...@gmail.com wrote:
Does not work :-(
Size of proto before: 196, size of proto after gzip: 196
What measures this? Nothing in any code you quoted.
Now my code are:
206 template class T int
207 ProtoT::CompressProtoToString(std::string pOut,T pProto)
You never touch pOut.
208 {
209 // Resultado
210 int l_resultado = -1;
211
212 // Definimos el buffer al cual vamos a comprimir
213 const unsigned bufLength = 256;
214 unsigned char buffer[bufLength];
215
216 memset(buffer,0,256);
217
218
219 std::cout buffer std::endl;
220
221 // Obtenemos un array del proto serializado
222 ZeroCopyOutputStream* output = new
google::protobuf::io::ArrayOutputStream(buffer,bufLength);
223 // Introducimos las opciones de compression
224 GzipOutputStream::Options options;
225 options.format = GzipOutputStream::GZIP;
226 options.compression_level = NIVEL_COMPRESION;
What is the value of NIVEL_COMPRESION?
227
228 google::protobuf::io::GzipOutputStream
gzip_stream(output,options);
229 if (!pProto.SerializeToZeroCopyStream(gzip_stream))
230 {
231 std::cerr Error comprimiendo el proto a string.
std::endl;
232 }
233 gzip_stream.Close();
234 std::cout : buffer std::endl;
This will fail if any 0-bytes happen to get serialized (you're
treating buffer as a nul-terminated C-style string)
235
236 // Devolvemos el resultado
237 return l_resultado;
238 }
I suggest that you post a *complete*, compilable, testcase - it's just
too hard to diagnose what's going wrong by guessing what you are doing
in the surrounding code that you didn't provide.
Oliver
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