How I can covert this hexadecimal values to pixel values

While I'm reading data from an HID device for X and Y axis values, getting the X & Y axis data in Hexadecimal value. How I can covert this hexadecimal values to pixel v开发者_开发技巧alues.

Do you mean a hex string? like '5A'.
if so ive found sucess with this

function HexToInt(HexNum: string): LongInt;
begin
   Result:=StrToInt('$' + HexNum) ;
end;