vwprintf

Writes output to an array of wide characters under control of the wide-character format string.

Format

#include  <wchar.h>

int vwprintf  (const wchar_t *format, va_list
              arg);

Arguments

format: A pointer to a wide-character string containing the format specifications. For more information about format and conversion specifications and their corresponding arguments, see Chapter 2.
arg: The variable list of items needed for output.

Description

This function is equivalent to the wprintf function, with the variable argument list replaced by the arg argument. Initialize arg with the va_start macro, and possibly with subsequent va_arg calls. The vwprintf function does not invoke the va_end macro.

Return Values

x The number of wide characters written, not counting the terminating null wide character.

Negative value Indicates an error. Either n or more wide characters were requested to be written, or a conversion error occurred, in which case errno is set to EILSEQ.

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x	The number of wide characters written, not counting the terminating null wide character.
Negative value	Indicates an error. Either n or more wide characters were requested to be written, or a conversion error occurred, in which case errno is set to EILSEQ.