checkout protobuf
svn checkout http://protobuf.googlecode.com/svn/trunk protobuf
compile, install
[dennis@localhost protobuf]$ cd protobuf
[dennis@localhost protobuf]$ sh autogen.sh
[dennis@localhost protobuf]$ ./configure
[dennis@localhost protobuf]$ make check
[dennis@localhost protobuf]$ make install
[dennis@localhost protobuf]$ protoc --version
libprotoc 2.5.1
write sample code
[dennis@localhost protobuf]$ mkdir ../google-code-sample
[dennis@localhost protobuf]$ cd ../google-code-sample
[dennis@localhost google-code-sample]$ vim addressbook.proto
[dennis@localhost google-code-sample]$ vim pb_write.cc
[dennis@localhost google-code-sample]$ vim pb_read.cc
[dennis@localhost google-code-sample]$ vim Makefile
cat addressbook.proto
package tutorial;
message Person {
required string name = 1;
required int32 id = 2;
optional string email = 3;
enum PhoneType {
MOBILE = 0;
HOME = 1;
WORK = 2;
}
message PhoneNumber {
required string number = 1;
optional PhoneType type = 2 [default = HOME];
}
repeated PhoneNumber phone = 4;
}
message AddressBook {
repeated Person person = 1;
}
cat pb_write.cc
#include <iostream>
#include <fstream>
#include <string>
#include "addressbook.pb.h"
using namespace std;
// This function fills in a Person message based on user input.
void PromptForAddress(tutorial::Person* person) {
cout << "Enter person ID number: ";
int id;
cin >> id;
person->set_id(id);
cin.ignore(256, '\n');
cout << "Enter name: ";
getline(cin, *person->mutable_name());
cout << "Enter email address (blank for none): ";
string email;
getline(cin, email);
if (!email.empty()) {
person->set_email(email);
}
while (true) {
cout << "Enter a phone number (or leave blank to finish): ";
string number;
getline(cin, number);
if (number.empty()) {
break;
}
tutorial::Person::PhoneNumber* phone_number = person->add_phone();
phone_number->set_number(number);
cout << "Is this a mobile, home, or work phone? ";
string type;
getline(cin, type);
if (type == "mobile") {
phone_number->set_type(tutorial::Person::MOBILE);
} else if (type == "home") {
phone_number->set_type(tutorial::Person::HOME);
} else if (type == "work") {
phone_number->set_type(tutorial::Person::WORK);
} else {
cout << "Unknown phone type. Using default." << endl;
}
}
}
// Main function: Reads the entire address book from a file,
// adds one person based on user input, then writes it back out to the same
// file.
int main(int argc, char* argv[]) {
// Verify that the version of the library that we linked against is
// compatible with the version of the headers we compiled against.
GOOGLE_PROTOBUF_VERIFY_VERSION;
if (argc != 2) {
cerr << "Usage: " << argv[0] << " ADDRESS_BOOK_FILE" << endl;
return -1;
}
tutorial::AddressBook address_book;
{
// Read the existing address book.
fstream input(argv[1], ios::in | ios::binary);
if (!input) {
cout << argv[1] << ": File not found. Creating a new file." << endl;
} else if (!address_book.ParseFromIstream(&input)) {
cerr << "Failed to parse address book." << endl;
return -1;
}
}
// Add an address.
PromptForAddress(address_book.add_person());
{
// Write the new address book back to disk.
fstream output(argv[1], ios::out | ios::trunc | ios::binary);
if (!address_book.SerializeToOstream(&output)) {
cerr << "Failed to write address book." << endl;
return -1;
}
}
// Optional: Delete all global objects allocated by libprotobuf.
google::protobuf::ShutdownProtobufLibrary();
return 0;
}
cat pb_read.cc
#include <iostream>
#include <fstream>
#include <string>
#include "addressbook.pb.h"
using namespace std;
// Iterates though all people in the AddressBook and prints info about them.
void ListPeople(const tutorial::AddressBook& address_book) {
for (int i = 0; i < address_book.person_size(); i++) {
const tutorial::Person& person = address_book.person(i);
cout << "Person ID: " << person.id() << endl;
cout << " Name: " << person.name() << endl;
if (person.has_email()) {
cout << " E-mail address: " << person.email() << endl;
}
for (int j = 0; j < person.phone_size(); j++) {
const tutorial::Person::PhoneNumber& phone_number = person.phone(j);
switch (phone_number.type()) {
case tutorial::Person::MOBILE:
cout << " Mobile phone #: ";
break;
case tutorial::Person::HOME:
cout << " Home phone #: ";
break;
case tutorial::Person::WORK:
cout << " Work phone #: ";
break;
}
cout << phone_number.number() << endl;
}
}
}
// Main function: Reads the entire address book from a file and prints all
// the information inside.
int main(int argc, char* argv[]) {
// Verify that the version of the library that we linked against is
// compatible with the version of the headers we compiled against.
GOOGLE_PROTOBUF_VERIFY_VERSION;
if (argc != 2) {
cerr << "Usage: " << argv[0] << " ADDRESS_BOOK_FILE" << endl;
return -1;
}
tutorial::AddressBook address_book;
{
// Read the existing address book.
fstream input(argv[1], ios::in | ios::binary);
if (!address_book.ParseFromIstream(&input)) {
cerr << "Failed to parse address book." << endl;
return -1;
}
}
ListPeople(address_book);
// Optional: Delete all global objects allocated by libprotobuf.
google::protobuf::ShutdownProtobufLibrary();
return 0;
}
cat Makefile
CC = g++
FLAGS = -Wall
PRO_F = addressbook
PRO_SRC= $(PRO_F).pb.cc
LIBS = -lprotobuf
TARGET = pb_write pb_read
all:$(TARGET)
pb_write: proto_file
$(CC) $(FLAGS) $(LIBS) -o $@ pb_write.cc $(PRO_SRC)
pb_read: proto_file
$(CC) $(FLAGS) $(LIBS) -o $@ pb_read.cc $(PRO_SRC)
proto_file: $(PRO_F).proto
protoc -I=./ --cpp_out=./ $(PRO_F).proto
.PHONEY:clean
clean:
rm -f $(TARGET) $(OBJS) $(PRO_F).pb.h $(PRO_F).pb.cc
Files:
[dennis@localhost google-code-sample]$ ls
addressbook.proto Makefile pb_read.cc pb_write.cc
Compile and run:
[dennis@localhost google-code-sample]$ make
protoc -I=./ --cpp_out=./ addressbook.proto
g++ -Wall -lprotobuf -o pb_write pb_write.cc addressbook.pb.cc
g++ -Wall -lprotobuf -o pb_read pb_read.cc addressbook.pb.cc
[dennis@localhost google-code-sample]$ ls
addressbook.pb.cc addressbook.pb.h addressbook.proto Makefile pb_read pb_read.cc pb_write pb_write.cc
[dennis@localhost google-code-sample]$ ./pb_write dennis
dennis: File not found. Creating a new file.
Enter person ID number: 13
Enter name: dennis
Enter email address (blank for none): dennis.cpp@gmail.com
Enter a phone number (or leave blank to finish): 14159265358
Is this a mobile, home, or work phone? mobile
Enter a phone number (or leave blank to finish):
[dennis@localhost google-code-sample]$ ./pb_write dennis
Enter person ID number: 19
Enter name: tina
Enter email address (blank for none): tina.mm@gmail.com
Enter a phone number (or leave blank to finish): 21714169628
Is this a mobile, home, or work phone? home
Enter a phone number (or leave blank to finish):
[dennis@localhost google-code-sample]$ ./pb_read dennis
Person ID: 13
Name: dennis
E-mail address: dennis.cpp@gmail.com
Mobile phone #: 14159265358
Person ID: 19
Name: tina
E-mail address: tina.mm@gmail.com
Home phone #: 21714169628
[dennis@localhost google-code-sample]$ ls
addressbook.pb.cc addressbook.pb.h addressbook.proto dennis Makefile pb_read pb_read.cc pb_write pb_write.cc
Problem:
solution of error while loading shared libraries,
look here
for details.