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Function Details : vwprintf

intvwprintf(const wchar_t * format,va_list args) ;

Return Type : int

Integer type (typically 4 bytes, -2,147,483,648 to 2,147,483,647)
Read about return values of vwprintf function .

1st Parameter Type : const wchar_t *

A pointer to a read-only wide-character string, where each character is of type `wchar_t`. Used for representing text in wide-character encoding to support extended character sets, such as Unicode. The string is null-terminated, with the terminator being a `wchar_t` with value 0.

1st Parameter

Pointer to a null-terminated wide-character string specifying the format of the output. It may include format specifiers like `%ls`, `%d`, etc.

2nd Parameter Type : va_list

A data type used to hold information about variable arguments passed to a variadic function. It is initialized with `va_start`, used with `va_arg`, and cleaned up with `va_end`.

2nd Parameter

The variable argument list containing the values to be formatted and written. It must be initialized with `va_start`.

Read more about parameters of vwprintf in parameters section
The vwprintffunction in C language Prints formatted wide character output to the standard output using a va_list.
vwprintf is similar to wprintf, but instead of taking a variable number of arguments, it takes a va_list that has been initialized by va_start. This function writes the formatted wide character output to the standard output stream (stdout).
The vwprintffunction takes 2 parameters:
  • •
    const wchar_t * `format`: Pointer to a null-terminated wide-character string specifying the format of the output. It may include format specifiers like `%ls`, `%d`, etc.
  • •
    va_list `args`: The variable argument list containing the values to be formatted and written. It must be initialized with `va_start`.
Writes a formatted wide-character output to the standard output (`stdout`) based on the format string `format` and the values in the `va_list` object `args`. Returns the number of wide characters written, or a negative value if an error occurs.
The vwprintf function return value :
  • Returns the number of wide characters written, or a negative value if an error occurred

Output

This example demonstrates using vwprintf in a custom logging function that can handle various types of wide character arguments.