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

[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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[protobuf] About import

[ZHOU Xiaobo]

I can't use import ../other_path/xx.proto.
It seems that the 'import' instruction doesn't search files out of 'ptoto_path'

thanks.

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

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

[ZHOU Xiaobo]

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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[protobuf] does android sdk include protobuf lib?

[ZHOU Xiaobo]

I want to use protobuf in an android project, 
but when I generated a jar for all protocols I used, 
I found that it's 300KB large.

So does android have the plan to migrate protobuf?
thx


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