[protobuf] How to use a different protoc version?

[elmer]

Hi there,

When I want use the gRPC and make the C++ files, I got the following error:

error: This file was generated by an older version of protoc which is
error: incompatible with your Protocol Buffer headers. Please
error: regenerate this file with a newer version of protoc.

It seems that I have installed different versions in my system (macOS). I 
checked my protoc version using the command "protoc --version", I got 

libprotoc 3.2.0

Then, I try to upgrade my protoc using the "brew upgrade protobuf", I got 

protobuf 3.5.1_1 already installed

So I also noticed the version 3.5.1 protoc is in 
/usr/local/opt/protobuf/share/doc/protobuf 
. And in /usr/local/opt there is a protobuf folder and a protobuf@3.5 
folder. So I think the error I got when I make the C++ file is caused 
because the 3.5.1 version of protoc is needed but the 3.2.0 version is used.

Am I right? If yes, how can I switch from 3.2.0 to the 3.5.1 version?

Thanks!

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Re: [protobuf] Default value not accessible in proto3

['Feng Xiao' via Protocol Buffers]

On Thu, Apr 26, 2018 at 2:12 AM love sidhu  wrote:

> Hi,
>
> This is how my response message is defined in proto file.
>
> message Response{
>  bool isOk = 1;
> }
>
>
> When I set this bool value in gRPC server to false, I'm not receiving it
> on client side
>
If you receive an empty Response message, it means the value of the isOk
field is the default which is false. Why do you care to send it over the
wire?


> but If I set this bool value to true I receive it on client side.
>
> I read this link:
> https://stackoverflow.com/questions/41089035/protobuf-default-values
> and saw that default values are not sent on wire and in case of boolean
> variables, False is default value. I don't know how true it is?
>
>
> Is there some general proper way of how to handle this for all types of
> variables(int32, bool etc.)
>

> Thanks,
> Lovepreet
>
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[protobuf] Default value not accessible in proto3

[love sidhu]

Hi,

This is how my response message is defined in proto file.

message Response{
 bool isOk = 1;
}


When I set this bool value in gRPC server to false, I'm not receiving it on 
client side
but If I set this bool value to true I receive it on client side. 

I read this link: 
https://stackoverflow.com/questions/41089035/protobuf-default-values 
and saw that default values are not sent on wire and in case of boolean 
variables, False is default value. I don't know how true it is?


Is there some general proper way of how to handle this for all types of 
variables(int32, bool etc.)

Thanks,
Lovepreet 

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