Re: [protobuf] Can a message derive from another message?

2011-03-03 Thread Evan Jones 

On 03/02/2011 10:04 AM, ZHOU Xiaobo wrote:

 required string Content = 3;


WARNING: You should be using type bytes here, not type string. This 
doesn't matter for C++, but matters for other languages which will 
assume strings contain UTF-8 data.


Evan

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Re: [protobuf] Can a message derive from another message?

2011-03-03 Thread ZHOU Xiaobo 
thank you.
It sounds like what I am looking for




No, message inheritance is not supported. Have a look at
http://code.google.com/apis/protocolbuffers/docs/techniques.html#union and
see if that solves your use case.

On Wed, Mar 2, 2011 at 7:04 AM, ZHOU Xiaobo xb.z...@qq.com wrote:

 Hi:
   My problem is that when I receive a packet I have to check one field( say
 'int32 COMMAND' ) to decide
 the type of the inner packet. For example:

 message OutterPkt {
required fiexed32 Length = 1;
required int32 COMMAND = 2;
required string Content = 3;
 }

 message InnerPktA {
 required int32 UserID;
 required int16 UserGender;
 }

 message InnerPktB {
required string UserName = 1;
reruired string UserDescripton = 2;
 }

 my code to process this packet will be:

 ..
 OuuterPkt outp;
 outp.ParseFromString(inputbuf);
 if (outp.COMMAND == 1) {
InnerPktA pkta;
pkta.ParseFromString(outp.Content());
..
 } else if (outp.COMMAND == 2) {
InnerPktB pktb;
pktb.ParseFromString(outp.Content());
..
 } else {

 }


 My question is: I think the pseudo code above is not efficient because it
 parses the buffer twice and there are too many memcpy.
 Is there a better way to deal with this situation?
 thanks.X

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Re: [protobuf] Can a message derive from another message?

2011-03-03 Thread ZHOU Xiaobo 
thanks

On 03/02/2011 10:04 AM, ZHOU Xiaobo wrote:
  required string Content = 3;

WARNING: You should be using type bytes here, not type string. This 
doesn't matter for C++, but matters for other languages which will 
assume strings contain UTF-8 data.

Evan

-- 
http://evanjones.ca/

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Re: [protobuf] Can a message derive from another message?

2011-03-02 Thread Jason Hsueh 
No, message inheritance is not supported. Have a look at
http://code.google.com/apis/protocolbuffers/docs/techniques.html#union and
see if that solves your use case.

On Wed, Mar 2, 2011 at 7:04 AM, ZHOU Xiaobo xb.z...@qq.com wrote:

 Hi:
   My problem is that when I receive a packet I have to check one field( say
 'int32 COMMAND' ) to decide
 the type of the inner packet. For example:

 message OutterPkt {
required fiexed32 Length = 1;
required int32 COMMAND = 2;
required string Content = 3;
 }

 message InnerPktA {
 required int32 UserID;
 required int16 UserGender;
 }

 message InnerPktB {
required string UserName = 1;
reruired string UserDescripton = 2;
 }

 my code to process this packet will be:

 ..
 OuuterPkt outp;
 outp.ParseFromString(inputbuf);
 if (outp.COMMAND == 1) {
InnerPktA pkta;
pkta.ParseFromString(outp.Content());
..
 } else if (outp.COMMAND == 2) {
InnerPktB pktb;
pktb.ParseFromString(outp.Content());
..
 } else {

 }


 My question is: I think the pseudo code above is not efficient because it
 parses the buffer twice and there are too many memcpy.
 Is there a better way to deal with this situation?
 thanks.X

 --
 You received this message because you are subscribed to the Google Groups
 Protocol Buffers group.
 To post to this group, send email to protobuf@googlegroups.com.
 To unsubscribe from this group, send email to
 protobuf+unsubscr...@googlegroups.com.
 For more options, visit this group at
 http://groups.google.com/group/protobuf?hl=en.



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