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message Person {
    optional string name = 1;
    optional int32 id = 2;
    optional string email = 3;
}

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Person john = Person.newBuilder()
                .setId(1234)   
                .setName("John Doe")   
                .setEmail("[email protected]")   
                .build();
output = new FileOutputStream(args[0]);
john.writeTo(output);

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Person john;
fstream input(argv[1],ios::in | ios::binary);
john.ParseFromIstream(&input);
id = john.id();
name = john.name();
email = john.email();