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vwprintf is a C standard library function as defined in stdio.h and it has function signature as
int vwprintf(const wchar_t *format, va_list args);
The functioning of vwprintf is same as that of swprintf. The difference between both functions is that the argument list has been replaced by a pointer to a list of argument. vwprintf performs the wide character output to the string like stdout and stdout should not be byte oriented.