Apologies - the obvious important detail, and I missed it out entirely.  I have 
tried both of the following with the same result:

   unsigned char* databuffer = (unsigned char*)malloc(datasize);
   [datastream getBytes:&databuffer range:NSMakeRange(positionCounter, 
datasize)]; // Packet content

and 

   unsigned char* bytes;
   [datastream getBytes:&bytes range:NSMakeRange(positionCounter, datasize)]; 
// Packet content

Either way, I get the same result.



On 26 May 2014, at 14:16, Uli Kusterer <witness.of.teacht...@gmx.net> wrote:

> On 26 May 2014, at 06:02, Pax <45rpmli...@googlemail.com> wrote:
>> This is my snippet of code:
>>                   [datastream getBytes:&bytes 
>> range:NSMakeRange(positionCounter, datasize)]; // Length of packet content
>>                   positionCounter+= datasize;
> 
> What is bytes declared as, and what do you initialize it to?
> 
> Cheers,
> -- Uli Kusterer
> “The Witnesses of TeachText are everywhere...”
> http://zathras.de
> 

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