Using windows API functions

["Antoine JORGE RIBEIRO" <softst1@bruker.fr>]

hi!
I desesperatly try to manage with the function ReadFile from Win32.Winbase,
in object ada (Aonix) and I don't understand How to use it and How the
lpBuffer : Win32.lpVoid might be used.
what's lpVoid, How can I Point to an array of Byte (mod 2**8).

Function is as described :
function ReadFile (    hFile                                         :
Win32.winnt.HANDLE;
                                      lpBuffer
: Win32.lpVoid;
                                      nNumberOfBytesToRead     :
Win32.Dword;
                                      lpNumberOfBytesToRead    :
Win32.LPDword;
                                      lpOverlapped
: LPOVERLAPPED)
                                return Win32.BOOL

Thanks for any kind of help

Antoine (a happy newbie)