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_vscprintf, _vscprintf_l, _vscwprintf, _vscwprintf_l 

Returns the number of characters in the formatted string using a pointer to a list of arguments.


int _vscprintf(
   const char *format,
      va_list argptr 
);
int _vscprintf_l(
      const char *format,
   locale_t locale,
      va_list argptr 
);
int _vscwprintf(
      const wchar_t *format,
   va_list argptr 
);
int _vscwprintf_l(
   const wchar_t *format,
   locale_t locale,
   va_list argptr 
);

Parameters

format

Format-control string.

argptr

Pointer to list of arguments.

locale

The locale to use.

For more information, see Format Specifications.

_vscprintf returns the number of characters that would be generated if the string pointed to by the list of arguments was printed or sent to a file or buffer using the specified formatting codes. The value returned does not include the terminating null character. _vscwprintf performs the same function for wide characters.

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.

If format is a null pointer, 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.

Each argument (if any) is converted according to the corresponding format specification in format. The format consists of ordinary characters and has the same form and function as the format argument for printf.

Security noteSecurity Note

Ensure that if format is a user-defined string, it is null terminated and has the correct number and type of parameters. For more information, see Avoiding Buffer Overruns.

Generic-Text Routine Mappings
TCHAR.H routine _UNICODE & _MBCS not defined _MBCS defined _UNICODE defined

_vsctprintf

_vscprintf

_vscprintf

_vscwprintf

_vsctprintf_l

_vscprintf_l

_vscprintf_l

_vscwprintf_l

Routine Required header Compatibility

_vscprintf, _vscprintf_l

<stdio.h>

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

_vscwprintf, _vscwprintf_l

<stdio.h> or <wchar.h>

Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For additional compatibility information, see Compatibility in the Introduction.

See the example for vsprintf.

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