Format
#include <stdarg.h>
#include <wchar.h>
int vwprintf(const wchar_t *format, va_list arg);Language Level: ANSI
Threadsafe: Yes.
Locale Sensitive: The behavior of this function might be affected by the LC_CTYPE and LC_NUMERIC categories of the current locale. It might also be affected by the LC_UNI_CTYPE and LC_UNI_NUMERIC categories of the current locale if LOCALETYPE(*LOCALEUCS2) or LOCALETYPE(*LOCALEUTF) is specified on the compilation command. This function is not available when LOCALETYPE(*CLD) is specified on the compilation command. For more information, see Understanding CCSIDs and Locales.
Integrated File System Interface: This function is not available when SYSIFCOPT(*NOIFSIO) is specified on the compilation command.
Wide Character Function: See Wide Characters for more information.
Description
The vwprintf() function is equivalent to the wprintf() function, except that the variable argument list is replaced by arg, which the va_start macro (and possibly subsequent va_arg calls) will have initialized. The vwprintf() function does not invoke the va_end macro.
Return Value
The vwprintf() function returns the number of wide characters transmitted. If an output error occurred, the vwprintf() returns a negative value.
Example that uses vwprintf()
This example prints the wide character a. The printing is done from the vout() function, which takes a variable number of arguments and uses the vwprintf()function to print them to stdout.
#include <wchar.h>
#include <stdarg.h>
#include <locale.h>
void vout (wchar_t *fmt, ...);
const char ifs_path[] = "tmp/mytest";
int main(void) {
FILE *stream;
wchar_t format[] = L"%lc";
setlocale(LC_ALL, "POSIX");
vout (format, L'a');
return(0);
/* A long a is written to stdout, if stdout is written to the screen
it may get converted back to a single byte 'a'. */
}
void vout (wchar_t *fmt, ...) {
va_list arg_ptr;
va_start (arg_ptr, fmt);
vwprintf (fmt, arg_ptr);
va_end (arg_ptr);
} Related Information