wsprintf - stare i niejare

witam
mam problemy z jedną z prostszych funkci winda, a dokładniej widowsową wersją dosowej funkcji. chodzi mianowicie o wsprintf. Piszę program obliczeniowy:

float v;
...
wsprintf(buf, "wynik = %f mag",v);
SetWindowText /*tu co trzeba*/;

otrzymuję:

wynik = f mag

dlaczego??
Pozdrawiam

Spróbuj zamaist %f napisac %lf. Jesli to nei zadzialal to nie wiem w czym mzoe byc blad :|

void Edit()
{
printf("Jednak nie działa. Kurde dołanczam sie do pytania :D");
}

Z tego co piszą w MSDNie to funkcja wsprintf obsługuje tylko następujące formaty:

c A single character. This sequence is interpreted as type WCHAR when the calling application uses the #define UNICODE compile flag and as type CHAR otherwise.
C A single character. This sequence is interpreted as type CHAR when the calling application uses the #define UNICODE compile flag and as type WCHAR otherwise.
d A signed decimal integer argument. This sequence is equivalent to the i sequence.
hc, hC A single character. The wsprintf function ignores character arguments with a numeric value of zero. This sequence is always interpreted as type CHAR, even when the calling application uses the #define UNICODE compile flag.
hd A signed short integer argument.
hs, hS A string. This sequence is always interpreted as type LPSTR, even when the calling application uses the #define UNICODE compile flag.
hu An unsigned short integer argument.
i A signed decimal integer. This sequence is equivalent to the d sequence.
lc, lC A single character. The wsprintf function ignores character arguments with a numeric value of zero. This sequence is always interpreted as type WCHAR, even when the calling application does not use the #define UNICODE compile flag.
ld A long signed decimal integer. This sequence is equivalent to the li sequence.
li A long signed decimal integer. This sequence is equivalent to the ld sequence.
ls, lS A string. This sequence is always interpreted as type LPWSTR, even when the calling application does not use the #define UNICODE compile flag. This sequence is equivalent to the ws sequence.
lu A long unsigned integer.
lx, lX A long unsigned hexadecimal integer in lowercase or uppercase.
s A string. This sequence is interpreted as type LPWSTR when the calling application uses the #define UNICODE compile flag and as type LPSTR otherwise.
S A string. This sequence is interpreted as type LPSTR when the calling application uses the #define UNICODE compile flag and as type LPWSTR otherwise.
u An unsigned integer argument.
x, X An unsigned hexadecimal integer in lowercase or uppercase.

Jak widać nie ma wśród nich odpowiedniego dla liczb zmienno przecinkowych (chociaż bardzo mnie to dziwi). Mozesz sprobowac zamiast wsprintf uzyc sprintf - z niąpowinno być wszystko w porządku.

bool _ftoa (TCHAR *szStr, double d)
{
        if (!szStr)
                return false ;

        gcvt (d, 15, szStr) ;
        if (szStr [lstrlen (szStr) - 1] == '.')
                szStr [lstrlen (szStr) - 1] = '\0' ;
return true ;
}

float v ;
TCHAR szV [32] ;

_ftoa (szV, (double) v) ;
wsprintf (buf, TEXT ("wynik = %s mag"), szV) ;

Spróbuj w ten sposób. Pozdrawiam.