シーケンス化方法json

At first, you should convert your NSString to UTF8 representation via [NSString UTF8String]. After that, i'd recommend to store in packet string length, and after that - the string characters themself. All that can be done via appending NSData, created from char* via [NSData dataWithBytes:]

NSMutableData packet = [[NSMutableData alloc] init]; [packet appendBytes:&msg.packetType, sizeof(msg.packetType)]; char *str = [yourString UTF8String]; int len = strlen(str); [packet appendBytes:(void*)&len, sizeof(len)]; [packet appendBytes:(void*)str, len]; 

To parse packet back, you should do:

NSData packet; // your packet [packet getBytes:(void*)&packet.msg range:NSMakeRange(0, sizeof(packet.msg))]; int len; [packet getBytes:(void*)&len range:NSMakeRange(sizeof(packet.msg), sizeof(len)]; NSData *strData = [packet subdataWithRange:NSMakeRange(sizeof(packet.msg) + sizeof(len)), packet.length]; NSString *str = [[NSString alloc] initWithData:strData encoding:UTF8Encoding];

NSJsonparser

 (IBAction)touchWriteButton:(id)sender {
      NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
      [dictionary setValue:@"Anthony" forKey:@"First Name"];
      [dictionary setValue:@"Robbins" forKey:@"Last Name"];
      [dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];
      NSArray *arrayOfAnthonysChildren = [[NSArray alloc] initWithObjects:@"Anthony's Son 1", @"Anthony's Daughter 1", @"Anthony's Son 2", @"Anthony's Son 3", @"Anthony's Daughter 2", nil];
      [dictionary setValue:arrayOfAnthonysChildren forKey:@"children"];
      NSError *error = nil;
      NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
      if (error) { 
         NSLog(@"dic->%@",error);
      }
      [dictionary release];
      BOOL succeed = [jsonData writeToFile:JSON_PATH atomically:YES];
      if (succeed) {
          NSLog(@"Save succeed");
      }else {
          NSLog(@"Save fail");
      }
 }