C语言库mbtowc()函数

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main () {
   char *str = "This is yiibai.com";
   wchar_t mb[100];
   int len;

   len = mblen(NULL, MB_CUR_MAX); 
   mbtowc(mb, str, len*strlen(str) );
   wprintf(L"%ls /n", mb );   

   return(0);
}