== Google Protocol Buffer
 

> aptitude install build-essential
> aptitude install python-dev

> wget http://protobuf.googlecode.com/files/protobuf-2.1.0.tar.gz
> tar zxvf protobuf-2.1.0.tar.gz
> cd protobuf-2.1.0
> ./configure
> make
> make check
> make install
> cd python
> python setup.py test
> python setup.py install

> cd
> mkdir src
> mkdir build
> cp /root/work/protobuf-2.1.0/examples/addressbook.proto /root/src/.
> export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
> protoc -I=src --python_out=build src/addressbook.proto
> ls build/addressbook_pb2.py


> protoc -I=src --python_out=build src/test.proto
> cd builed
> vim writhing.py

#! /usr/bin/python

import addressbook_pb2
import sys

# This function fills in a Person message based on user input.
def PromptForAddress(person):
  person.id = int(raw_input("Enter person ID number: "))
  person.name = raw_input("Enter name: ")

  email = raw_input("Enter email address (blank for none): ")
  if email != "":
    person.email = email

  while True:
    number = raw_input("Enter a phone number (or leave blank to finish): ")
    if number == "":
      break

    phone_number = person.phone.add()
    phone_number.number = number

    type = raw_input("Is this a mobile, home, or work phone? ")
    if type == "mobile":
      phone_number.type = addressbook_pb2.Person.MOBILE
    elif type == "home":
      phone_number.type = addressbook_pb2.Person.HOME
    elif type == "work":
      phone_number.type = addressbook_pb2.Person.WORK
    else:
      print "Unknown phone type; leaving as default value."

# Main procedure:  Reads the entire address book from a file,
#   adds one person based on user input, then writes it back out to the same
#   file.
if len(sys.argv) != 2:
  print "Usage:", sys.argv[0], "ADDRESS_BOOK_FILE"
  sys.exit(-1)

address_book = addressbook_pb2.AddressBook()

# Read the existing address book.
try:
  f = open(sys.argv[1], "rb")
  address_book.ParseFromString(f.read())
  f.close()
except IOError:
  print sys.argv[1] + ": Could not open file.  Creating a new one."

# Add an address.
PromptForAddress(address_book.person.add())

# Write the new address book back to disk.
f = open(sys.argv[1], "wb")
f.write(address_book.SerializeToString())
f.close()




> vim reading.py
#! /usr/bin/python

import addressbook_pb2
import sys

# Iterates though all people in the AddressBook and prints info about them.
def ListPeople(address_book):
  for person in address_book.person:
    print "Person ID:", person.id
    print "  Name:", person.name
    if person.HasField('email'):
      print "  E-mail address:", person.email

    for phone_number in person.phone:
      if phone_number.type == addressbook_pb2.Person.MOBILE:
        print "  Mobile phone #: ",
      elif phone_number.type == addressbook_pb2.Person.HOME:
        print "  Home phone #: ",
      elif phone_number.type == addressbook_pb2.Person.WORK:
        print "  Work phone #: ",
      print phone_number.number

# Main procedure:  Reads the entire address book from a file and prints all
#   the information inside.
if len(sys.argv) != 2:
  print "Usage:", sys.argv[0], "ADDRESS_BOOK_FILE"
  sys.exit(-1)

address_book = addressbook_pb2.AddressBook()

# Read the existing address book.
f = open(sys.argv[1], "rb")
address_book.ParseFromString(f.read())




> python writing.py google.txt
google.txt: Could not open file.  Creating a new one.
Enter person ID number: 1
Enter name: Jun
Enter email address (blank for none): sakaijunsoccer@gmail.com
Enter a phone number (or leave blank to finish): 111-111-111
Is this a mobile, home, or work phone? mobile
Enter a phone number (or leave blank to finish):



> python reading.py google.txt
Person ID: 1
  Name: Jun
  E-mail address: sakaijunsoccer@gmail.com
  Mobile phone #:  111-111-111