linux dirent.h 使用

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <dirent.h>

void print_usage(void)
{
	printf("Usage: programe_name dir_name\n");
}

int main(int argc,char *argv[])
{
	DIR * dp;
	struct dirent *filename;

	if (argc < 2)
	{
		print_usage();
		exit(1);
	}	

	dp = opendir(argv[1]);
	if (!dp)
	{
		fprintf(stderr,"open directory error\n");
		return 0;
	}
	while (filename=readdir(dp))
	{
		printf("filename:%s\n",filename->d_name);
	}
	closedir(dp);
	return 0;
}