title: cast vector<unsigned char> to uint8_t*
body: <p>I have a function that requires <code>uint8_t*</code> as an input (unsigned char). However, I have my string saved as <code>vector&lt;unsigned char&gt;</code>. How to convert that to <code>uint8_t*</code> for my function to be able to accept?</p>
  
  <p>Thank you.</p>