handles.c

不错书对C++/C程序员很有用的大家不要错过.

#include <stdio.h>

void main(void)
 {
	FILE *input;

	if ((input = fopen("\\CONFIG.SYS", "r")) == NULL)
		printf("Error opening \\CONFIG.SYS\N");
	else
  	 {
		printf("Handle for CONFIG.SYS %d\n", input->fd);
		printf("Handle for stdin %d\n", stdin->fd);
		printf("Handle for stdout %d\n", stdout->fd);
		printf("Handle for stderr %d\n", stderr->fd);
		printf("Handle for stdaux %d\n", stdaux->fd);
		printf("Handle for stdprn %d\n", stdprn->fd);
		fclose(input);
	 }
 }