`_putw`

Article
12/02/2022

Writes an integer to a stream.

Syntax

int _putw(
   int binint,
   FILE *stream
);

Parameters

binint
Binary integer to be output.

stream
Pointer to the FILE structure.

Return value

Returns the value written. A return value of EOF might indicate an error. Because EOF is also a legitimate integer value, use ferror to verify an error. If stream is a null pointer, the invalid parameter handler is invoked, as described in Parameter validation. If execution is allowed to continue, this function sets errno to EINVAL and returns EOF.

For information about these and other error codes, see errno, _doserrno, _sys_errlist, and _sys_nerr.

Remarks

The _putw function writes a binary value of type int to the current position of stream. _putw doesn't affect the alignment of items in the stream nor does it assume any special alignment. _putw is primarily for compatibility with previous libraries. Portability problems might occur with _putw because the size of an int and the ordering of bytes within an int differ across systems.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Requirements

Routine	Required header
`_putw`	<stdio.h>

For more compatibility information, see Compatibility.

Libraries

All versions of the C run-time libraries.

Example

// crt_putw.c
/* This program uses _putw to write a
* word to a stream, then performs an error check.
*/

#include <stdio.h>
#include <stdlib.h>

int main( void )
{
   FILE *stream;
   unsigned u;
   if( fopen_s( &stream, "data.out", "wb" ) )
      exit( 1 );
   for( u = 0; u < 10; u++ )
   {
      _putw( u + 0x2132, stream );   /* Write word to stream. */
      if( ferror( stream ) )         /* Make error check. */
      {
         printf( "_putw failed" );
         clearerr_s( stream );
         exit( 1 );
      }
   }
   printf( "Wrote ten words\n" );
   fclose( stream );
}

Output

Wrote ten words