In my Iphone App I've an TCP Connection and want recive data which works ok.
But I need to split an uint8_t Array.
unsigned result;
uint8_t buffer[1024];
len = [inputStream read:buffer maxLength:sizeof(buffer)];
NSString *hexstring = [NSString stringWithFormat:@"%02x%02x%02x%02x",buffer[3],buffer[2],buffer[1],buffer[0]];
result = 0;
NSScanner *scanner = [NSScanner scannerWithString:hexstring];
[scanner scanHexInt:&result];
NSLog(@"HexString: %@ Result: %i ",hexstring,result);
NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding];
Here I get the first 4 bytes to get the length of the recived package.
Now I want an output for the range of the buffer Array without buffer[1] - buffer[3]
I mean the Range from buffer[4] to buffer[length of packe].
How can I archive that?
i think the basic problem here is your use of a uint8_t array. As a C array, you should have a really compelling reason to use it in Objective-C. You don't have a compelling reason, here, and have identified a reason not to use it.
Instead of this:
uint8_t buffer[1024];
Use a NSMutableData built with dataWithCapacity:. Something like this:
NSMutableData *data = [NSMutableData dataWithCapacity:1024];
uint8_t *buffer = [data mutableBytes];
You can manipulate the data, then, with methods against data.
Alternately, you could use memmove (not memcopy) to manipulate your array directly. I don't think it's worth it, though; you can generally assume that Foundation will pick a good algorithm, whereas you're likely to pick the simplest, and you're more likely to introduce a block overrun.