Add Dart example.
diff --git a/examples/add_person.dart b/examples/add_person.dart
new file mode 100644
index 0000000..7aaa079
--- /dev/null
+++ b/examples/add_person.dart
@@ -0,0 +1,71 @@
+import 'dart:io';
+
+import 'dart_tutorial/addressbook.pb.dart';
+
+// This function fills in a Person message based on user input.
+Person promtForAddress() {
+
+ Person person = Person();
+
+ print('Enter person ID: ');
+ String input = stdin.readLineSync();
+ person.id = int.parse(input);
+
+ print('Enter name');
+ person.name = stdin.readLineSync();
+
+ print('Enter email address (blank for none) : ');
+ String email = stdin.readLineSync();
+ if (email.isNotEmpty) {
+ person.email = email;
+ }
+
+ while(true) {
+ print('Enter a phone number (or leave blank to finish): ');
+ String number = stdin. readLineSync();
+ if (number.isEmpty) break;
+
+ Person_PhoneNumber phoneNumber = Person_PhoneNumber();
+
+ phoneNumber.number = number;
+ print('Is this a mobile, home, or work phone? ');
+
+ String type = stdin.readLineSync();
+ switch(type) {
+ case 'mobile':
+ phoneNumber.type = Person_PhoneType.MOBILE;
+ break;
+ case 'home':
+ phoneNumber.type = Person_PhoneType.HOME;
+ break;
+ case 'work':
+ phoneNumber.type = Person_PhoneType.WORK;
+ break;
+ default:
+ print('Unknown phone type. Using default.');
+ }
+ person.phones.add(phoneNumber);
+ }
+
+ return person;
+}
+
+// Reads the entire address book from a file, adds one person based
+// on user input, then writes it back out to the same file.
+main(List<String> arguments) {
+ if (arguments.length != 1) {
+ print('Usage: add_person ADDRESS_BOOK_FILE');
+ exit(-1);
+ }
+
+ File file = File(arguments.first);
+ AddressBook addressBook;
+ if (!file.existsSync()) {
+ print('File not found. Creating new file.');
+ addressBook = AddressBook();
+ } else {
+ addressBook = AddressBook.fromBuffer(file.readAsBytesSync());
+ }
+ addressBook.people.add(promtForAddress());
+ file.writeAsBytes(addressBook.writeToBuffer());
+}
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