Trouble converting NSData to int

Question

I have an NSData object that contains just <64> which is supposed to represent the int 100 How can I convert this NSData to an int?

I can convert it to it's Chr equivalent d using

NSString *string = [[NSString alloc] initWithData:characteristic.value encoding:NSUTF8StringEncoding];

but I need the Dec equivalent of 100

Thanks

Answer 1

<64> means that the NSData object contains a single byte with the value 0x64 = 100, so the following should work;

const uint8_t *bytes = [data bytes]; // pointer to the bytes in data
int value = bytes[0]; // first byte