And nobody knows why it requires 40 bytes... :) Unless we have 5-byte words. :))

Vlad

>Hello Michel!
>
>Here is the aditional information about topic:
>
>Some DLL functions require more complex parameters, such as structures
>or arrays. If the function requires a pointer to a structure,
>you must determine the layout of the structure, then emulate it as a
>string in Visual FoxPro before passing it or receiving it from the DLL
> function. For example, the Windows system function GetSystemTime( )
>expects a pointer to a structure consisting of eight words or unsigned
> 16-bit integers indicating the year, month, day, and so on. The structure
> is defined this way:
>typedef struct _SYSTEMTIME {
> WORD wYear ;
> WORD wMonth ;
> WORD wDayOfWeek ;
> WORD wDay ;
> WORD wHour ;
> WORD wMinute ;
> WORD wSecond ;
> WORD wMilliseconds ;
>} SYSTEMTIME
>
>To pass data between Visual FoxPro and the GetSystemTime( ) function, you
> must create a 40-byte string buffer (consisting initially of spaces) and
>then pass the address of this string to the function for it to fill in.
>When
> the string is returned, you must parse it in 2-byte increments to extract
> the individual fields of the structure. The following fragment illustrates
>how you could extract three of the fields from the structure:
>
>DECLARE INTEGER GetSystemTime IN win32api STRING @
>cBuff=SPACE(40)
>=GetSystemTime(@cBuff)
>
>tYear = ALLTRIM(STR(ASC(SUBSTR(cBuff,2)) * ;
> 256 + ASC(SUBSTR(cBuff,1))))
>tMonth = ALLTRIM(STR(ASC(SUBSTR(cBuff,4)) * ;
> 256 + ASC(SUBSTR(cBuff,3))))
>tDOW = ALLTRIM(STR(ASC(SUBSTR(cBuff,6)) * ;
> 256 + ASC(SUBSTR(cBuff,5))))
>
>
>I think that it must be in FAQ under topic "How to pass structures into
>Win32 API".
>
>Have a happy day
>Vladimir Shevchenko
>
>> However, the 3rd parameter says "A pointer to a buffer containing the
>user
>> information structure.".