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const char *string ="Hi there,this is a C string";
NSData *data=[NSData dataWithBytes:string
length:strlen(string)+1];
NSLog(@"data is %@",data);
NSLog(@"%lu byte string is '%s'",[data length],[data bytes]);
This can be implied successfully. If the last sentence is:
NSLog(@"%d byte string is '%s'",[data length],[data bytes]);
it will warn that conversion specifies type ‘int’ but argument has typed ‘NSUInteger’ (aka’usigned long’)
Why %d can’t?
NSUInteger is basically an unsigned long, so use %lu instead.