Write formatted output using a pointer to a list of arguments.
int vfprintf( FILE *stream, const char *format, va_list argptr );
int vfwprintf( FILE *stream, const wchar_t *format, va_list argptr );
| Routine | Required Header | Optional Headers | Compatibility |
| vfprintf | <stdio.h> and <stdarg.h> | <varargs.h>1 | ANSI, Win 95 |
| vfwprintf | <stdio.h> or <wchar.h>, and <stdarg.h> | <varargs.h>1 | ANSI, Win 95, Win NT |
1 Required for UNIX V compatibility.
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
vfprintf and vfwprintf return the number of characters written, not including the terminating null character, or a negative value if an output error occurs.
Parameters
stream
Pointer to FILE structure
format
Format specification
argptr
Pointer to list of arguments
For more information, see Format Specifications.
Remarks
Each of these functions takes a pointer to an argument list, then formats and writes the given data to stream.
Generic-Text Routine Mappings
| TCHAR.H Routine | _UNICODE & _MBCS Not Defined | _MBCS Defined | _UNICODE Defined |
| _vftprintf | vfprintf | vfprintf | vfwprintf |