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copied!<p><strong>EDIT</strong> : I had answered this earlier but was deleted by moderator. So I have included some code from the tutorial.</p> <p>A tutorial which is almost same as the answer posted above - <a href="http://www.kotancode.com/2012/10/14/using-google-protocol-buffers-in-objective-c-on-ios-and-the-mac/">Using Google Protocol Buffers in Objective-C on iOS and the Mac</a></p> <p>Follow the steps given in learnvst's answer, and refer the comments for pitfalls. I followed the exact same steps except for </p> <blockquote> <p>add the directory of google headers to your additional include directories I added the <strong><em>src/</em></strong> directory in the header search paths, instead of the google directory.</p> </blockquote> <p>Also, when i did <code>#import xyz.pb.h</code> the project wasn't building. When I renamed my <strong>.m</strong> file to <strong>.mm</strong> i was able to build. This point is mentioned in the tutorial very subtly :P.</p> <blockquote> <p>Basically, any <strong>.m</strong> file which is importing a any <strong>.pb.h</strong> file, should be renamed with extension <strong>.mm</strong></p> </blockquote> <p>Here's some content from the tutorial - </p> <p><strong>PROTO FILE</strong></p> <pre><code>package kotancode; enum ZombieType { SLOW = 0; FAST = 1; } message ZombieSighting { required string name = 1; required double longitude = 2; required double latitude = 3; optional string description = 4; required ZombieType zombieType = 5 [default = SLOW]; } </code></pre> <p><strong>ZombieSightingMessage.h</strong> </p> <pre><code>// -- ZombieSightingMessage.h - note my C++ object is not in the public interface. #import <Foundation/Foundation.h> @interface ZombieSightingMessage : NSObject - (void)doSomething; @end </code></pre> <p><strong>ZombieSightingMessage.mm</strong></p> <pre><code>// -- ZombieSightingMessage.mm #import <UIKit/UIKit.h> #import "ZombieSightingMessage.h" #import "zombie.pb.h" @implementation ZombieSightingMessage - (void)doSomething { // Doing random stuff with a UIView here to show the mixing // of C++ and Objective-C/Cocoa syntax in the same file... UIView *uiView = [[UIView alloc] init]; [uiView setCenter:CGPointMake(20, 10)]; // instantiate my protobuf-generated C++ class. kotancode::ZombieSighting *zombieSighting = new kotancode::ZombieSighting(); zombieSighting->set_name("Kevin"); zombieSighting->set_description("This is a zombie"); zombieSighting->set_latitude(41.007); zombieSighting->set_longitude(21.007); zombieSighting->set_zombietype(kotancode::ZombieType::FAST); // Some small tomfoolery required to go from C++ std::string to NSString. std::string x = zombieSighting->DebugString(); NSString *output = [NSString stringWithCString:x.c_str() encoding:[NSString defaultCStringEncoding]]; NSLog(@"zombie: %@", output); // Instantiate another zombie from the previous zombie's raw bytes. NSData *rawZombie = [self getDataForZombie:zombieSighting]; kotancode::ZombieSighting *otherZombie = [self getZombieFromData:rawZombie]; // Dump the second zombie so we can see they match identically... NSString *newOutput = [NSString stringWithCString:otherZombie->DebugString().c_str() encoding:[NSString defaultCStringEncoding]]; NSLog(@"other zombie: %@", newOutput); // Grimace all you want, but this is C++ and we need to clean up after ourselves. free(zombieSighting); free(otherZombie); } // Serialize to NSData. Note this is convenient because // we can write NSData to things like sockets... - (NSData *)getDataForZombie:(kotancode::ZombieSighting *)zombie { std::string ps = zombie->SerializeAsString(); return [NSData dataWithBytes:ps.c_str() length:ps.size()]; } // De-serialize a zombie from an NSData object. - (kotancode::ZombieSighting *)getZombieFromData:(NSData *)data { int len = [data length]; char raw[len]; kotancode::ZombieSighting *zombie = new kotancode::ZombieSighting; [data getBytes:raw length:len]; zombie->ParseFromArray(raw, len); return zombie; } @end </code></pre> <p><strong>EDIT</strong> : I am using Xcode 4.5. Even after I followed all the steps I was getting a linker error.</p> <blockquote> <p>symbols not found for architecture i386</p> </blockquote> <p>Due to this I couldnt run the code on simulator. But it worked on actual device</p>

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