vfwprintf()
QNX SDP8.0C Library ReferenceAPIDeveloper
Write formatted wide-character output to a file (varargs)
Synopsis:
#include <wchar.h>
#include <stdarg.h>
int vfwprintf( FILE * fp,
const wchar_t * format,
va_list arg );
Arguments:
- fp
- The stream to which you want to send the output.
- format
- A wide-character string that specifies the format of the output. The formatting string determines what additional arguments you need to provide. For more information, see printf().
- arg
- A variable-argument list of the additional arguments, which you must have initialized with the va_start() macro.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The vfwprintf() function writes output to the file pointed to by fp, under control of the argument format.
The vfwprint() function is the wide-character version of
vfprintf(),
and is a varargs
version of
fwprintf().
Returns:
The number of wide characters written, excluding the terminating NUL, or a negative number if an error occurred (errno is set).
Errors:
Refer to the Errors section of the printf() function for a list of possible errors.
Classification:
| Safety: | |
|---|---|
| Cancellation point | Yes |
| Signal handler | No |
| Thread | Yes |
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