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_printf_p, _printf_p_l, _wprintf_p, _wprintf_p_l


The latest version of this topic can be found at _printf_p, _printf_p_l, _wprintf_p, _wprintf_p_l.

Prints formatted output to the standard output stream, and enables specification of the order in which parameters are used in the format string.

int _printf_p(  
   const char *format [,  
int _printf_p_l(  
   const char *format,  
   locale_t locale [,  
int _wprintf_p(  
   const wchar_t *format [,  
int _wprintf_p_l(  
   const wchar_t *format,  
   locale_t locale [,  


Format control.

Optional arguments.

The locale to use.

Returns the number of characters printed or a negative value if an error occurs.

The _printf_p function formats and prints a series of characters and values to the standard output stream, stdout. If arguments follow the format string, the format string must contain specifications that determine the output format for the arguments (see printf_p Positional Parameters).

The difference between _printf_p and printf_s is that _printf_p supports positional parameters, which allows specifying the order in which the arguments are used in the format string. For more information, see printf_p Positional Parameters.

_wprintf_p is the wide-character version of _printf_p; they behave identically if the stream is opened in ANSI mode. _printf_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.

System_CAPS_ICON_important.jpg Important

Ensure that format is not a user-defined string.

If format or argument are NULL, or of the format string contains invalid formatting characters, _printf_p and _wprintf_p functions invoke an invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, the function returns -1 and sets errno to EINVAL.

Generic-Text Routine Mappings

Tchar.h routine_UNICODE and _MBCS not defined_MBCS defined_UNICODE defined
RoutineRequired header
_printf_p, _printf_p_l<stdio.h>
_wprintf_p, _wprintf_p_l<stdio.h> or <wchar.h>

The console is not supported in Windows 8.x 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 8.x Store apps. For more compatibility information, see Compatibility.

// crt_printf_p.c  
// This program uses the _printf_p and _wprintf_p  
// functions to choose the order in which parameters  
// are used.  
#include <stdio.h>  
int main( void )  
   // Positional arguments   
   _printf_p( "Specifying the order: %2$s %3$s %1$s %4$s %5$s.\n",  
              "little", "I'm", "a", "tea", "pot");  
   // Resume arguments  
   _wprintf_p( L"Reusing arguments: %1$d %1$d %1$d %1$d\n", 10);  
   // Width argument  
   _printf_p("Width specifiers: %1$*2$s", "Hello\n", 10);  

Specifying the order: I'm a little tea pot.  
Reusing arguments: 10 10 10 10  
Width specifiers:     Hello  

Floating-Point Support
Stream I/O
fopen, _wfopen
_fprintf_p, _fprintf_p_l, _fwprintf_p, _fwprintf_p_l
fprintf, _fprintf_l, fwprintf, _fwprintf_l
fprintf_s, _fprintf_s_l, fwprintf_s, _fwprintf_s_l
scanf, _scanf_l, wscanf, _wscanf_l
scanf_s, _scanf_s_l, wscanf_s, _wscanf_s_l
_sprintf_p, _sprintf_p_l, _swprintf_p, _swprintf_p_l
sprintf, _sprintf_l, swprintf, _swprintf_l, __swprintf_l
sprintf_s, _sprintf_s_l, swprintf_s, _swprintf_s_l
vprintf Functions