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_vprintf_p, _vprintf_p_l, _vwprintf_p, _vwprintf_p_l

Writes formatted output by using a pointer to a list of arguments, and enables specification of the order in which the arguments are used.

int _vprintf_p(
   const char *format,
   va_list argptr 
int _vprintf_p_l(
   const char *format,
   locale_t locale,
   va_list argptr 
int _vwprintf_p(
   const wchar_t *format,
   va_list argptr 
int _vwprintf_p_l(
   const wchar_t *format,
   locale_t locale,
   va_list argptr 


Format specification.


Pointer to list of arguments.


The locale to use.

For more information, see Format Specifications.

_vprintf_p and _vwprintf_p return the number of characters written, not including the terminating null character, or a negative value if an output error occurs.

Each of these functions takes a pointer to an argument list, then formats and writes the given data to stdout. These functions differ from vprintf_s and vwprintf_s only in that they support the ability to specify the order in which the arguments are used. For more information, see printf_p Positional Parameters.

_vwprintf_p is the wide-character version of _vprintf_p; the two functions behave identically if the stream is opened in ANSI mode. _vprintf_p doesn't currently support output into a UNICODE stream.

The versions of these functions with the _l suffix are identical except that they use the locale parameter passed in instead of the current thread locale.

Security note Security Note

Ensure that format is not a user-defined string. For more information, see Avoiding Buffer Overruns.

If format is a null pointer, or if the format string contains invalid formatting characters, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, the functions return -1 and set errno to EINVAL.

Generic-Text Routine Mappings

TCHAR.H routine

_UNICODE & _MBCS not defined

_MBCS defined

_UNICODE defined










Required header

Optional headers

_vprintf_p , _vprintf_p_l

<stdio.h> and <stdarg.h>


_vwprintf_p , _vwprintf_p_l

<stdio.h> or <wchar.h>, and <stdarg.h>


* Required for UNIX V compatibility.

The console is not supported in Windows Store apps. The standard stream handles that are associated with the console—stdin, stdout, and stderr—must be redirected before C run-time functions can use them in Windows Store apps. For additional compatibility information, see Compatibility.

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