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diff --git a/examples/protobuf/objc/main.m b/examples/protobuf/objc/main.m
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+/****************************************************************************
+**
+** Copyright (C) 2018 Ivan Komissarov
+** Contact: abbapoh@gmail.com
+**
+** This file is part of Qbs.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms and
+** conditions see http://www.qt.io/terms-conditions. For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#import "Addressbook.pbobjc.h"
+
+#import <Foundation/Foundation.h>
+
+int printUsage(char *argv0)
+{
+    NSString *programName = [[NSString alloc] initWithUTF8String:argv0];
+    NSLog(@"%@", [[NSString alloc] initWithFormat:@"Usage: %@ add|list ADDRESS_BOOK_FILE", programName]);
+    [programName release];
+    return -1;
+}
+
+NSString *readString(NSString *promt)
+{
+    NSLog(@"%@", promt);
+    NSFileHandle *inputFile = [NSFileHandle fileHandleWithStandardInput];
+    NSData *inputData = [inputFile availableData];
+    NSString *result = [[[NSString alloc]initWithData:inputData encoding:NSUTF8StringEncoding] autorelease];
+    result = [[result stringByTrimmingCharactersInSet:
+            [NSCharacterSet whitespaceAndNewlineCharacterSet]] autorelease];
+    return result;
+}
+
+// This function fills in a Person message based on user input.
+void promptForAddress(Person* person)
+{
+    person.id_p = [readString(@"Enter person ID number:") intValue];
+    person.name = readString(@"Enter name:");
+
+    NSString *email = readString(@"Enter email address (blank for none):");
+    if ([email length] != 0)
+        person.email = email;
+
+    while (true) {
+        NSString *number = readString(@"Enter a phone number (or leave blank to finish):");
+        if ([number length] == 0)
+            break;
+
+        Person_PhoneNumber* phoneNumber = [[Person_PhoneNumber alloc] init];
+        phoneNumber.number = number;
+
+        NSString *type = readString(@"Is this a mobile, home, or work phone?:");
+        NSLog(@"\"%@\"", type);
+        if ([type compare:@"mobile"] == NSOrderedSame)
+            phoneNumber.type = Person_PhoneType_Mobile;
+        else if ([type compare:@"home"] == NSOrderedSame)
+            phoneNumber.type = Person_PhoneType_Home;
+        else if ([type compare:@"work"] == NSOrderedSame)
+            phoneNumber.type = Person_PhoneType_Work;
+        else
+            NSLog(@"%@", @"Unknown phone type.  Using default.");
+
+        [person.phonesArray addObject:phoneNumber];
+    }
+}
+
+// Iterates though all people in the AddressBook and prints info about them.
+void listPeople(AddressBook *addressBook)
+{
+    NSArray *people = addressBook.peopleArray;
+    for (unsigned i = 0; i < [people count]; i++) {
+        Person *person = [people objectAtIndex:i];
+
+        NSLog(@"%@", [[[NSString alloc] initWithFormat:@"Person ID: %d", person.id_p] autorelease]);
+        NSLog(@"%@", [[[NSString alloc] initWithFormat:@"Person name: %@", person.name] autorelease]);
+
+        if ([person.email length] != 0) {
+            NSLog(@"%@", [[[NSString alloc] initWithFormat:@"E-mail address: %@", person.email] autorelease]);
+        }
+
+        NSArray *phones = person.phonesArray;
+        for (unsigned j = 0; j < [phones count]; j++) {
+            Person_PhoneNumber *phoneNumber = [phones objectAtIndex:j];
+            NSString *phonePrefix;
+
+            switch (phoneNumber.type) {
+            case Person_PhoneType_Mobile:
+                phonePrefix = @"Mobile phone";
+                break;
+            case Person_PhoneType_Home:
+                phonePrefix = @"Home phone";
+                break;
+            case Person_PhoneType_Work:
+                phonePrefix = @"Work phone";
+                break;
+            default:
+                phonePrefix = @"Unknown phone";
+                break;
+            }
+
+            NSLog(@"%@", [[[NSString alloc] initWithFormat:@"  %@ #: %@", phonePrefix, phoneNumber.number] autorelease]);
+        }
+        printf("\n");
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 3)
+        return printUsage(argv[0]);
+
+    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+
+    AddressBook *addressBook;// = [AddressBook alloc];
+    NSString *filePath = [[[NSString alloc] initWithUTF8String:argv[2]] autorelease];
+
+    // Read the existing address book.
+    NSData *data = [NSData dataWithContentsOfFile:filePath];
+    if (!data) {
+        NSLog(@"%@", [[NSString alloc] initWithFormat:@"%@ : File not found.", filePath]);
+        addressBook = [[[AddressBook alloc] init] autorelease];
+    } else {
+        NSError *error;
+        addressBook = [AddressBook parseFromData:data error:&error];
+        if (!addressBook) {
+            NSLog(@"%@", @"Failed to parse address book.");
+            [pool drain];
+            return -1;
+        }
+    }
+
+    if (strcmp(argv[1], "add") == 0) {
+        // Add an address.
+        Person *person = [[Person alloc] init];
+        promptForAddress(person);
+        [addressBook.peopleArray addObject:person];
+
+        if (!data) {
+            NSLog(@"%@", @"Creating a new file.");
+        }
+        [[addressBook data] writeToFile:filePath atomically:YES];
+    } else if (strcmp(argv[1], "list") == 0) {
+        listPeople(addressBook);
+    } else {
+        [pool drain];
+        return printUsage(argv[0]);
+    }
+
+    [pool drain];
+    return 0;
+}