Getting Integers from hex Data stored in a char array

[Bill Maclennan]

Hi,

Part of my code receives data in a char array, with pairs of characters representing a hex value - e.g. Array = "1234abcd" really represents 0x12, 0x34, 0xab, 0xcd.

I need to convert the pairs of characters into ints, is there a nice elegant way to do this? I have currently implemented a switch solution (below), but it seems a bit messy.

int convertChar(char tChar){
  switch(tChar){
    case 'A':
    case 'a':
      return 10;
    break;
    case 'B':
    case 'b':
      return 11;
    break
 ......
    default:
      return (int)(tChar - '0');
    break;
  }
}
 
int main(){
  char msg[64] = "1234abcd..........etc........
  int i=0;
  int value = 0
 
  for(i=0; i<32; i++)
    value = (convertChar(msg[ 2 * i ]) * 16) + convertChar[msg[2 * i + 1];
 
    cout << value;
 
  }
  return 0;
}

[Banfa]

I need to convert the pairs of characters into ints, is there a nice elegant way to do this? I have currently implemented a switch solution (below), but it seems a bit messy.

It may seem messy but it is in fact the normal way of doing this sort of thing.

[Bill Maclennan]

It may seem messy but it is in fact the normal way of doing this sort of thing.

Really? Ok that makes me feel better then, thanks.

Bill