cpp/io/c/vfwprintf

Loads the data from locations, defined by ,, converts them to wide string equivalents and writes the results to a variety of sinks.

@1@ Writes the results to stdout. @2@ Writes the results to a file stream. @3@ Writes the results to a wide string. At most wide characters are written followed by null wide character.

Return value
@1,2@ Number of wide characters written if successful or negative value if an error occurred. @3@ Number of wide characters written (not counting the terminating null wide character) if successful or negative value if an encoding error occurred or if the number of characters to be generated was equal or greater than.