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Why is this an issue?

  Using an array index to compute the address of the first character in a string can lead to a range
  check error if range checking is enabled and the string is empty. When range checking is disabled,
  such an expression evaluates to nil. In all cases except that of empty strings with
  range checking enabled, casting to an untyped pointer type is equivalent.


  If a non-nil pointer is required, then the result of the cast can be checked and handled
  appropriately.


  This is especially relevant to interactions with the WinAPI, where strings are always passed by
  character pointer.


How to fix it

  Cast the string to Pointer to get the address of the first character without the
  possibility of a range check error.


Resources

  
    
      RAD Studio documentation: String Types (Delphi)