Converting NSdata to bytes & then converting the first n bytes to int

Question

I\'ve a NSData object. First I want to convert NSData object to bytes, then read the first four bytes in this NSData object and then conve

Answer 1

int n ; // first n bytes
NSData *data; // your data

NSData *subData = [data subdataWithRange:NSMakeRange(0, n)]; // make sure if data has n bytes

NSString *stringData = [subData description];
stringData = [stringData substringWithRange:NSMakeRange(1, [stringData length]-2)];

unsigned dataAsInt = 0;
NSScanner *scanner = [NSScanner scannerWithString: stringData];
[scanner scanHexInt:& dataAsInt];