Protocol Buffers - Code Example
This directory contains example code that uses Protocol Buffers to manage an address book. Two programs are provided for each supported language. The add_person example adds a new person to an address book, prompting the user to input the person's information. The list_people example lists people already in the address book. The examples use the exact same format in all three languages, so you can, for example, use add_person_java to create an address book and then use list_people_python to read it.
These examples are part of the Protocol Buffers tutorial, located at: https://developers.google.com/protocol-buffers/docs/tutorials
Build the example using bazel
The example requires bazel 0.5.4 or newer to build. You can download/install the latest version of bazel from bazel's release page:
Once you have bazel installed, simply run the following command in this examples directory to build the code:
$ bazel build :all
Then you can run the built binary:
$ bazel-bin/add_person_cpp addressbook.data
Build the example using make
You must install the protobuf package before you can build it using make. The minimum requirement is to install protocol compiler (i.e., the protoc binary) and the protobuf runtime for the language you want to build.
You can simply run "make" to build the example for all languages (except for Go). However, since different language has different installation requirement, it will likely fail. It's better to follow individual instrutions below to build only the language you are interested in.
You can follow instructions in ../src/README.md to install protoc and protobuf C++ runtime from source.
Then run "make cpp" in this examples directory to build the C++ example. It will create two executables: add_person_cpp and list_people_cpp. These programs simply take an address book file as their parameter. The add_person_cpp programs will create the file if it doesn't already exist.
To run the examples:
$ ./add_person_cpp addressbook.data $ ./list_people_cpp addressbook.data
Note that on some platforms you may have to edit the Makefile and remove "-lpthread" from the linker commands (perhaps replacing it with something else). We didn't do this automatically because we wanted to keep the example simple.
$ pip install protobuf
Make sure the runtime version is the same as protoc binary, or it may not work.
After you have install both protoc and python runtime, run "make python" to build two executables (shell scripts actually): add_person_python and list_people_python. They work the same way as the C++ executables.
Follow instructions in ../README.md to install protoc and then download protobuf Java runtime .jar file from maven:
Then run the following:
$ export CLASSPATH=/path/to/protobuf-java-[version].jar $ make java
This will create the add_person_java/list_people_java executables (shell scripts) and can be used to create/display an address book data file.
The Go example requires a plugin to the protocol buffer compiler, so it is not build with all the other examples. See:
for more information about Go protocol buffer support.
First, install the Protocol Buffers compiler (protoc).
Then, install the Go Protocol Buffers plugin ($GOPATH/bin must be in your $PATH for protoc to find it):
go get github.com/golang/protobuf/protoc-gen-go
Build the Go samples in this directory with "make go". This creates the following executable files in the current directory:
To run the example:
to add a person to the protocol buffer encoded file addressbook.data. The file is created if it does not exist. To view the data, run:
Observe that the C++, Python, and Java examples in this directory run in a similar way and can view/modify files created by the Go example and vice versa.