清除一个流

[c]代码库

#include <string.h>
#include <stdio.h>
#include <conio.h>
#include <io.h>

void flush ( FILE *stream );

int main ( void )
{
	FILE *stream;
	char msg[] = "This is a test";

	/* create a file */
	stream = fopen ( "DUMMY.FIL", "w" );

	/* write some data to the file */
	fwrite ( msg, strlen ( msg ), 1, stream );

	clrscr();
	printf ( "Press any key to flush\
   DUMMY.FIL:" );
	getch();

	/* flush the data to DUMMY.FIL without\
	   closing it */
	flush ( stream );

	printf ( "\nFile was flushed, Press any key\
   to quit:" );
	getch();
	return 0;
}

void flush ( FILE *stream )
{
	int duphandle;

	/* flush the stream's internal buffer */
	fflush ( stream );

	/* make a duplicate file handle */
	duphandle = dup ( fileno ( stream ) );

	/* close the duplicate handle to flush\
	   the DOS buffer */
	close ( duphandle );
}