swprintf doesn't works, always returns garbage, on NDK8d with STLPORT

[Whiso]

Hi!!

I'm using wchars string, i need to format string, but when the function swprintf is used, this returns incorrect characters, I'm using STLPORT and NDK8d,

why this function does't work yet!!

Cheers!!

[Jeffrey Walton]

How does it return incorrect characters?

Are you using it correctly? To use s{w}printf correctly, use element
counts (not byte counts). The function returns -1 on failure, and the
number of required character. Truncation occurs when 'required >=
given'. So:

wchar_t buffer[256]
size = COUNTOF(buff); // 256; not sizeof(x) !!!
int written = swprintf(buffer, size "%s", <some wide string>);
if(-1 == written || written >= COUNTOF(buff))
abort(); // Failed

Here's a reference, but its kind of broken since it does not tell you
about truncation: http://www.cplusplus.com/reference/cwchar/swprintf/.

If you are defining NDK_DEBUG, you should also define _STLP_DEBUG=1
when using STLPort. You might get an assert or debug diagnostic
message.

Jeff

[Whiso]

Thanks a lot, for your replies, I had to change this function by other one to fix this problem, but i think this function is very important because almost all app supports 

multi-language , so if our app needs to manage all languages in unicode, that's a big trouble

[Tor Lillqvist]

so if our app needs to manage all languages in unicode, that's a big trouble

Have you heard of UTF-8? 

--tml

[Whiso]

Yep!! I had to change unicode string to UTF-8 but i had fix on my function to paint letters on screen to use UTF-8