_fprintf_p, _fprintf_p_l, _fwprintf_p, _fwprintf_p_l
Prints formatted data to a stream.
int _fprintf_p( FILE *stream, const char *format [, argument ]... ); int _fprintf_p_l( FILE *stream, const char *format, locale_t locale [, argument ]... ); int _fwprintf_p( FILE *stream, const wchar_t *format [, argument ]... ); int _fwprintf_p_l( FILE *stream, const wchar_t *format, locale_t locale [, argument ]... );
_fprintf_p formats and prints a series of characters and values to the output stream. Each function argument (if any) is converted and output according to the corresponding format specification in format. For _fprintf_p, the format argument has the same syntax and use that it has in _printf_p. These functions support positional parameters, meaning that the order of the parameters used by the format string can be changed. For more information about positional parameters, see printf_p Positional Parameters.
_fwprintf_p is a wide-character version of _fprintf_p; in _fwprintf_p, format is a wide-character string. These functions behave identically if the stream is opened in ANSI mode. _fprintf_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 locale.
Security Note
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|---|
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Ensure that format is not a user-defined string. |
Like the non-secure versions (see fprintf, _fprintf_l, fwprintf, _fwprintf_l), these functions validate their parameters and invoke the invalid parameter handler, as described in Parameter Validation, if either stream or format is a null pointer or if there are any unknown or badly formed formatting specifiers. If execution is allowed to continue, the functions return -1 and set errno to EINVAL.
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Tchar.h routine |
_UNICODE and _MBCS not defined |
_MBCS defined |
_UNICODE defined |
|---|---|---|---|
|
_ftprintf_p |
_fprintf_p |
_fprintf_p |
_fwprintf_p |
|
_ftprintf_p_l |
_fprintf_p_l |
_fprintf_p_l |
_fwprintf_p_l |
For more information, see Format Specifications.
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Function |
Required header |
|---|---|
|
_fprintf_p , _fprintf_p_l |
<stdio.h> |
|
_fwprintf_p , _fwprintf_p_l |
<stdio.h> or <wchar.h> |
For more compatibility information, see Compatibility in the Introduction.
// crt_fprintf_p.c
// This program uses _fprintf_p to format various
// data and print it to the file named FPRINTF_P.OUT. It
// then displays FPRINTF_P.OUT on the screen using the system
// function to invoke the operating-system TYPE command.
//
#include <stdio.h>
#include <process.h>
int main( void )
{
FILE *stream = NULL;
int i = 10;
double fp = 1.5;
char s[] = "this is a string";
char c = '\n';
// Open the file
if ( fopen_s( &stream, "fprintf_p.out", "w" ) == 0)
{
// Format and print data
_fprintf_p( stream, "%2$s%1$c", c, s );
_fprintf_p( stream, "%d\n", i );
_fprintf_p( stream, "%f\n", fp );
// Close the file
fclose( stream );
}
// Verify our data
system( "type fprintf_p.out" );
}
this is a string 10 1.500000
