Linux下 C++遍历目录下所有文件

      在Linux下，用 c++ 遍历目录下的所有文件比较简单，代码如下，有需要的可以参考~

#include <iostream>
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <string.h>
using namespace std;

/***** Global Variables *****/
char dir[100] = "/home";
int const MAX_STR_LEN = 200;

/* Show all files under dir_name , do not show directories ! */
void showAllFiles( const char * dir_name )
{
	// check the parameter !
	if( NULL == dir_name )
	{
		cout<<" dir_name is null ! "<<endl;
		return;
	}

	// check if dir_name is a valid dir
	struct stat s;
	lstat( dir_name , &s );
	if( ! S_ISDIR( s.st_mode ) )
	{
		cout<<"dir_name is not a valid directory !"<<endl;
		return;
	}
	
	struct dirent * filename;    // return value for readdir()
 	DIR * dir;                   // return value for opendir()
	dir = opendir( dir_name );
	if( NULL == dir )
	{
		cout<<"Can not open dir "<<dir_name<<endl;
		return;
	}
	cout<<"Successfully opened the dir !"<<endl;
	
	/* read all the files in the dir ~ */
	while( ( filename = readdir(dir) ) != NULL )
	{
		// get rid of "." and ".."
		if( strcmp( filename->d_name , "." ) == 0 || 
			strcmp( filename->d_name , "..") == 0    )
			continue;
		cout<<filename ->d_name <<endl;
	}
} 

int main()
{
	// 测试
	showAllFiles( dir );
	
	return 0;
}