Boost_file_system

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#include < boost/filesystem.hpp>  
using namespace boost::filesystem;

  1. file name operation 

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    //Note the difference between /= and +=, /= means appending directory， += means string concatenation 
    path dir("C:\\Windows");
    dir /= "System32";       
    dir /= "services.exe";
    std::cout << dir.string() << std::endl;           
    std::cout << dir.parent_path()<< std::endl;        /C:\Windows\System32
    std::cout << dir.filename()<< std::endl;           /services.exe
    std::cout << dir.stem()<< std::endl;               //services
    std::cout << dir.extension()<< std::endl;          //.exe

  2. file operation: rename, remove, copy

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    exists(path);                               
    is_directory(path); 
    is_regular_file(path);                    
                                              
    remove_all(const Path& p);  //remove all files recursively                                                              
    rename(const Path1& from_p, const Path2& to_p);                        
    copy_file(const Path1& from_fp, const Path2& to_fp);                    
    create_directory(const Path & p);
    create_directories(const Path & p); //make directory recursively</pre>

  3. shallow visit directory

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    path dir2("c:\\Windows\\System32");
    directory_iterator end;
    for (directory_iterator pos(dir2); pos != end; pos++)
    {
    	std::cout << *pos << std::endl;
    }

  4. deep visit directory: like DFS, stack push&&pop

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    typedef recursive_directory_iterator rd_iterator;
    path dir2("E:\\Student");
    rd_iterator end;
    for (rd_iterator pos(dir); pos != end; pos++)
    {
        if (is_directory(*pos) && pos.level() > 4)
        {
            pos.no_push();
        }
        if (*pos == "nofind.txt")
        {
            pos.pop();
        }	
        else
        {
            cout<< pos->path().filename().string()<< endl;
        }
    }

  5. catch error

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    try
    {
        path dir2("c:\\Windows\\System32");
        assert(is_directory(dir2));          
        assert(exists(dir2));          
    }
    catch(filesystem_error& e)
    {
        std::cout << e.path1() << std::endl;
        std::cout << e.what() << std::endl;
    }