On Jul 4, 2009, at 10:56 AM, Scott Andrew wrote:
In all honesty the easiest way is to do it in C. Add a 4 byte variable to the top of your packet header.. When building the packet set it to 0.. That solves your problem of getting data into the packet.But if you want to add something to the beginning, using NSMutableData, you have to first create the NSMutableData packet with 4 bytes of 0s then call [data appendBytes].. So something like so (not perfect)..
Maybe I missed your point, but you can easily insert bytes in an NSMutableData. Check the documentation for -[NSMutableData replaceBytesInRange:withBytes:length:].
On Jul 4, 2009, at 9:23 AM, Carlo Gulliani wrote:NSMutableData *data = [NSData dataWithBytes:&packet length:sizeof (packet)];
Note that this is /not/ an NSMutableData, in spite of the declaration, since you've used NSData to create it. Use [NSMutableData dataWithBytes:length:] to create a mutable data instance.
-- Adam
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