?對文件夾里面的文件進行遍歷操作是基本技能之一，python，perl以及bash等腳本都很好的實現了文件遍歷方法，對于c/c++來說，只能通過系統自定的api獲取。雖然文件夾操作本身是調用操作系統內核的接口，但畢竟接口不夠友好。

? ? ? ?boost不愧是準標準庫，filesystem提供了極為簡便的方法，如下所示:

[cpp] view plaincopyprint?

//??filesystem?tut3.cpp??---------------------------------------------------------------//??

??

//??Copyright?Beman?Dawes?2009??

??

//??Distributed?under?the?Boost?Software?License,?Version?1.0.??

//??See?http://www.boost.org/LICENSE_1_0.txt??

??

//??Library?home?page:?http://www.boost.org/libs/filesystem??

??

#include?<iostream>??

#include?<iterator>??

#include?<algorithm>??

#include?<boost/filesystem.hpp>??

using?namespace?std;??

using?namespace?boost::filesystem;??

??

int?main(int?argc,?char*?argv[])??

{??

??if?(argc?<?2)??

??{??

????cout?<<?"Usage:?tut3?path\n";??

????return?1;??

??}??

??

??path?p?(argv[1]);???//?p?reads?clearer?than?argv[1]?in?the?following?code??

??

??try??

??{??

????if?(exists(p))????//?does?p?actually?exist???

????{??

??????if?(is_regular_file(p))????????//?is?p?a?regular?file???

????????cout?<<?p?<<?"?size?is?"?<<?file_size(p)?<<?'\n';??

??

??????else?if?(is_directory(p))??????//?is?p?a?directory???

??????{??

????????cout?<<?p?<<?"?is?a?directory?containing:\n";??

??

????????copy(directory_iterator(p),?directory_iterator(),??//?directory_iterator::value_type??

??????????ostream_iterator<directory_entry>(cout,?"\n"));??//?is?directory_entry,?which?is??

???????????????????????????????????????????????????????????//?converted?to?a?path?by?the??

???????????????????????????????????????????????????????????//?path?stream?inserter??

??????}??

??????else??

????????cout?<<?p?<<?"?exists,?but?is?neither?a?regular?file?nor?a?directory\n";??

????}??

????else??

??????cout?<<?p?<<?"?does?not?exist\n";??

??}??

??

??catch?(const?filesystem_error&?ex)??

??{??

????cout?<<?ex.what()?<<?'\n';??

??}??

??

??return?0;??

}??

然而，每次寫程序都要附上如此一大篇代碼，很不美觀。故作了簡單封裝。

.h文件

[cpp] view plaincopyprint?

#ifndef?DIRFILEOPT_HHHH??

#define?DIRFILEOPT_HHHH??

??

#include?<iostream>??

#include?<vector>??

#include?<string>??

??

using?std::vector;??

using?std::string;??

??

class?CFileOpt??

{??

private:??

????bool?m_bIsDir;??

????bool?m_bIsFile;??

????char*?m_pFileName;??

????bool?mDirOrFile();??

??

public:??

????CFileOpt(char*);??

????vector<string>&?mGetSubFiles(vector<string>&?lstpFileNames);??

????~CFileOpt();??

};#endif??

.cpp文件[cpp] view plaincopyprint?

#define?_SCL_SECURE_NO_WARNINGS??

#include?"FileOpt.h"??

#include?<iterator>??

#include?<algorithm>??

#include?<boost/filesystem.hpp>??

#include?<boost/algorithm/string/classification.hpp>??

#include?<boost/algorithm/string.hpp>??

using?namespace?std;??

using?namespace?boost::filesystem;??

??

bool?CFileOpt::mDirOrFile()??

{??

????if(NULL?==?m_pFileName)??

????????return?false;??

????path?p(m_pFileName);??

????try{??

????????if(exists(p)){?????

????????????if?(is_regular_file(p))?????????

????????????????m_bIsFile?=?true;?????????????

????????????else?if?(is_directory(p)){??

????????????????m_bIsDir?=?true;??

????????????}??

????????}else{??

????????????return?false;??

????????}??

????}catch?(const?filesystem_error&?ex){??

#ifdef?DEBUG??

????????printf(ex.what());??

#endif??

????}??

????return?true;??

}??

CFileOpt::CFileOpt(char*?pfilename):??

????m_pFileName(pfilename),m_bIsDir(false),m_bIsFile(false){??

????????mDirOrFile();??

}??

vector<string>&?CFileOpt::mGetSubFiles(vector<string>&?lstpFileNames)??

{??

????if(m_bIsDir){??

????????path?p(m_pFileName);??

????????typedef?vector<path>?vec;?????????????//?store?paths,??

????????vec?pathes;??

#ifdef?DEBUG??

????copy(directory_iterator(p),?directory_iterator(),ostream_iterator<directory_entry>(cout,"\n"));??

#endif??

????????copy(directory_iterator(p),?directory_iterator(),?back_inserter(pathes));??

????????for(auto?iter?=?pathes.begin();iter?!=?pathes.end();iter?++){??

????????????lstpFileNames.push_back(iter->generic_string());??

????????}??

????????return?lstpFileNames;??

????}else{??

#ifdef?DEBUG??

????????printf("No?SubFiles?In?%s\n",m_pFileName);??

#endif??

????}??

????return?lstpFileNames;??

}??

CFileOpt::~CFileOpt(){??

????m_pFileName?=?NULL;??

}??

調用構造函數，傳入文件夾的名字，通過mGetSubFiles()函數就可以返回文件夾內的文件路徑。

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