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;
}