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libobjc2 runtime warning I don't understand why I get it

From: Sebastian Reitenbach
Subject: libobjc2 runtime warning I don't understand why I get it
Date: Wed, 26 Jun 2013 09:17:08 +0200
User-agent: SOGoMail 2.0.6

I get the following runtime warning from libobjc2 in debug mode:

Calling [SnifferController -handlePacket:] with incorrect signature.  Method 
has address@hidden:address@hidden, selector has address@hidden:4r*8

- handlePacket is defined in my libpcap wrapper GSPcap.h as a delegate 
protocol, the application has to implement:
@protocol GSPcapDelegate
-(void) handlePacket: (NSData *) _packet;

and in GSPcap.m its called like this:

 * callback function called from pcap_loop
got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet)
  NSData *pData = [NSData dataWithBytes:packet length:header->len];
  if ([[(id)args delegate] conformsToProtocol:@protocol(GSPcapDelegate)])
      [(id<GSPcapDelegate>)[(id)args delegate] handlePacket:pData];

The SnifferController, part of my application implements the protocol

SnifferController.h:-(void)handlePacket: (NSData *)_packet;
SnifferController.m:-(void)handlePacket: (NSData *)_packet

and while compiling, I don't get any warnings.

Now, I don't understand why I get the warning from libobjc2, anything I do 
Before I changed it to use NSData * as parameter, I just passed (const char *) 
to it,
and I did not got the warning when running the application.


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