What is vfwscanf() in C?

vfwscanf() reads a formatted list of arguments from an input stream. The declaration for vfwscanf() is shown below:

int vfwscanf( FILE *stream, const wchar_t *format, va_list args);

Parameters

stream: Pointer to the input stream from which the input is to be read
format: Format in which the input will be read
args: Pointer to the list of arguments in which data will be read

Return value

If the read operation from the input stream is successful, vfwscanf() returns the number of arguments that are read. If the read operation is not successful, EOFEnd-of-File is returned.

Example

Consider the code snippet below, which demonstrates the use of vfwscanf():

main.c

vfwscanfExample.txt

#include <stdio.h>
#include <wchar.h>
#include <stdarg.h>

int readformatted (FILE * stream, const wchar_t * format, ...)
{
  int len=0;
  va_list arg_list;
  va_start (arg_list, format);
  len = vfwscanf (stream, format, arg_list);
  va_end (arg_list);
  return len;
}

int main ()
{
   FILE * fPointer = fopen ("vfwscanfExample.txt","r");
  
   if(fPointer == NULL){
     printf("%s Could not open file!!");
   } else{
     wchar_t buff[200];
     int len = readformatted(fPointer,L" %s",buff);
     printf("File Content: %s \n", buff);
     printf("Number of arguments read from file: %d \n", len);
     fclose (fPointer);
   }
   return 0;
}

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What is vfwscanf() in C?

Parameters

Return value

Example

Explanation