Re: Problem to MergeFromCodedStream()

2009-01-13 Thread Kenton Varda 
On Mon, Jan 12, 2009 at 8:32 PM, Dave Bailey d...@daveb.net wrote:


 I agree, and it seems to be a question that comes up frequently in
 this forum, so maybe we should add a page to the Wiki that discusses
 how to send and receive a stream of protobuf (or any) messages.


I did add some documentation on that here:
http://code.google.com/apis/protocolbuffers/docs/techniques.html#streaming


 Things like run length encoding, magic bytes, checksums, record types
 - these are either highly desirable or absolutely necessary when
 streaming blocks of opaque binary data over a network connection,
 reading a sequence of them from a file, or whatever.  I think there
 may be a misconception out there that libprotobuf somehow magically
 takes care of all those things.  It seems to me that people need to
 conceive of a serialized protobuf object as the payload to a packet,
 and it is their job to design a packet header that describes the
 payload with sufficient information such that it can be extracted and
 dispatched to the appropriate handler.


Well said.

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Re: Problem to MergeFromCodedStream()

2009-01-12 Thread chongyc 

Thank you very much for your help.

I want parsing string 's' by reading each a byte from s.

What is alternative way that you can recommend to me.



On Jan 12, 11:28 am, chongyc chongy...@gmail.com wrote:
 I write test code following below.

         t2r::prot::Request msg0, msg2, msg3, msg4;
         std::string s;

        // set all fields of msg.
        .
        .

         bool b;
         b = msg0.SerializeToString(s);      // OK
         msg0.PrintDebugString();

         b = msg2.ParseFromString(s);        // OK
         b = msg2.IsInitialized();                  // OK
         msg0.PrintDebugString();

         for(int i= 0; i  s.size(); ++i)
         {
                 char c = s[i];

                 std::cout  ==   i   
 = 
 std::endl;

                 google::protobuf::io::ArrayInputStream inp(c, 1);
                 google::protobuf::io::CodedInputStream decoder(inp);
                 b = msg3.MergeFromCodedStream(decoder);             // FAILED
                 msg3.PrintDebugString();

                 std::cout    std::endl;

                 b = msg4.MergePartialFromCodedStream
 (decoder);                     // OK
                 msg4.PrintDebugString();
                 b = msg4.IsInitialized();             // FAILED
         }

         b = msg3.IsInitialized();             // FAILED
         b = msg4.IsInitialized();             // FAILED

 I want parsing string 's' by reading each a byte from s.
 What is wrong.
 Please help me.
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Re: Problem to MergeFromCodedStream()

2009-01-12 Thread Kenton Varda 
Read all the bytes into a buffer, then parse the buffer once you have the
whole thing.

On Mon, Jan 12, 2009 at 4:11 PM, chongyc chongy...@gmail.com wrote:


 Thank you very much for your help.

 I want parsing string 's' by reading each a byte from s.

 What is alternative way that you can recommend to me.



 On Jan 12, 11:28 am, chongyc chongy...@gmail.com wrote:
  I write test code following below.
 
  t2r::prot::Request msg0, msg2, msg3, msg4;
  std::string s;
 
 // set all fields of msg.
 .
 .
 
  bool b;
  b = msg0.SerializeToString(s);  // OK
  msg0.PrintDebugString();
 
  b = msg2.ParseFromString(s);// OK
  b = msg2.IsInitialized();  // OK
  msg0.PrintDebugString();
 
  for(int i= 0; i  s.size(); ++i)
  {
  char c = s[i];
 
  std::cout  ==   i  
 = 
  std::endl;
 
  google::protobuf::io::ArrayInputStream inp(c, 1);
  google::protobuf::io::CodedInputStream decoder(inp);
  b = msg3.MergeFromCodedStream(decoder); //
 FAILED
  msg3.PrintDebugString();
 
  std::cout   
 std::endl;
 
  b = msg4.MergePartialFromCodedStream
  (decoder); // OK
  msg4.PrintDebugString();
  b = msg4.IsInitialized(); // FAILED
  }
 
  b = msg3.IsInitialized(); // FAILED
  b = msg4.IsInitialized(); // FAILED
 
  I want parsing string 's' by reading each a byte from s.
  What is wrong.
  Please help me.
 


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Re: Problem to MergeFromCodedStream()

2009-01-12 Thread chongyc 

When I send multiple messages, I should delimit them, and parse the
buffer.

What is the best way delimitting it  that you can recommend me ?



On Jan 13, 8:18 am, Kenton Varda ken...@google.com wrote:
 Read all the bytes into a buffer, then parse the buffer once you have the
 whole thing.

 On Mon, Jan 12, 2009 at 4:11 PM, chongyc chongy...@gmail.com wrote:

  Thank you very much for your help.

  I want parsing string 's' by reading each a byte from s.

  What is alternative way that you can recommend to me.

  On Jan 12, 11:28 am, chongyc chongy...@gmail.com wrote:
   I write test code following below.

           t2r::prot::Request msg0, msg2, msg3, msg4;
           std::string s;

          // set all fields of msg.
          .
          .

           bool b;
           b = msg0.SerializeToString(s);      // OK
           msg0.PrintDebugString();

           b = msg2.ParseFromString(s);        // OK
           b = msg2.IsInitialized();                  // OK
           msg0.PrintDebugString();

           for(int i= 0; i  s.size(); ++i)
           {
                   char c = s[i];

                   std::cout  ==   i  
  = 
   std::endl;

                   google::protobuf::io::ArrayInputStream inp(c, 1);
                   google::protobuf::io::CodedInputStream decoder(inp);
                   b = msg3.MergeFromCodedStream(decoder);             //
  FAILED
                   msg3.PrintDebugString();

                   std::cout   
  std::endl;

                   b = msg4.MergePartialFromCodedStream
   (decoder);                     // OK
                   msg4.PrintDebugString();
                   b = msg4.IsInitialized();             // FAILED
           }

           b = msg3.IsInitialized();             // FAILED
           b = msg4.IsInitialized();             // FAILED

   I want parsing string 's' by reading each a byte from s.
   What is wrong.
   Please help me.
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Re: Problem to MergeFromCodedStream()

2009-01-12 Thread Kenton Varda 
Send the size of the message first, then the data.

On Mon, Jan 12, 2009 at 4:34 PM, chongyc chongy...@gmail.com wrote:


 When I send multiple messages, I should delimit them, and parse the
 buffer.

 What is the best way delimitting it  that you can recommend me ?



 On Jan 13, 8:18 am, Kenton Varda ken...@google.com wrote:
  Read all the bytes into a buffer, then parse the buffer once you have the
  whole thing.
 
  On Mon, Jan 12, 2009 at 4:11 PM, chongyc chongy...@gmail.com wrote:
 
   Thank you very much for your help.
 
   I want parsing string 's' by reading each a byte from s.
 
   What is alternative way that you can recommend to me.
 
   On Jan 12, 11:28 am, chongyc chongy...@gmail.com wrote:
I write test code following below.
 
t2r::prot::Request msg0, msg2, msg3, msg4;
std::string s;
 
   // set all fields of msg.
   .
   .
 
bool b;
b = msg0.SerializeToString(s);  // OK
msg0.PrintDebugString();
 
b = msg2.ParseFromString(s);// OK
b = msg2.IsInitialized();  // OK
msg0.PrintDebugString();
 
for(int i= 0; i  s.size(); ++i)
{
char c = s[i];
 
std::cout  ==   i  
   = 
std::endl;
 
google::protobuf::io::ArrayInputStream inp(c, 1);
google::protobuf::io::CodedInputStream decoder(inp);
b = msg3.MergeFromCodedStream(decoder);
 //
   FAILED
msg3.PrintDebugString();
 
std::cout   
   std::endl;
 
b = msg4.MergePartialFromCodedStream
(decoder); // OK
msg4.PrintDebugString();
b = msg4.IsInitialized(); // FAILED
}
 
b = msg3.IsInitialized(); // FAILED
b = msg4.IsInitialized(); // FAILED
 
I want parsing string 's' by reading each a byte from s.
What is wrong.
Please help me.
 


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