C++ 如何获取给定文件夹中具有特定扩展名的文件列表？
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How to get list of files with a specific extension in a given folder?
提问by Jim
I want to get the file names of all files that have a specific extension in a given folder (and recursively, its subfolders). That is, the file name (and extension), not the full file path. This is incredibly simple in languages like Python, but I'm not familiar with the constructs for this in C++. How can it be done?
我想获取给定文件夹（及其子文件夹）中具有特定扩展名的所有文件的文件名。也就是说，文件名（和扩展名），而不是完整的文件路径。这在 Python 之类的语言中非常简单，但我不熟悉 C++ 中的构造。怎么做到呢？
回答by Gigi
#define BOOST_FILESYSTEM_VERSION 3
#define BOOST_FILESYSTEM_NO_DEPRECATED
#include <boost/filesystem.hpp>
using namespace std;
namespace fs = ::boost::filesystem;
// return the filenames of all files that have the specified extension
// in the specified directory and all subdirectories
void get_all(const fs::path& root, const string& ext, vector<fs::path>& ret)
{
if(!fs::exists(root) || !fs::is_directory(root)) return;
fs::recursive_directory_iterator it(root);
fs::recursive_directory_iterator endit;
while(it != endit)
{
if(fs::is_regular_file(*it) && it->path().extension() == ext) ret.push_back(it->path().filename());
++it;
}
}
回答by cck
a C++17 code
一个 C++17 代码
#include <fstream>
#include <iostream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
int main()
{
std::string path("/your/dir/");
std::string ext(".sample");
for(auto& p: fs::recursive_directory_iterator(path)
{
if(p.path().extension() == ext())
std::cout << p << '\n';
}
return 0;
}
回答by Rafael Baptista
On windows you do something like this:
在 Windows 上，您可以执行以下操作：
void listFiles( const char* path )
{
struct _finddata_t dirFile;
long hFile;
if (( hFile = _findfirst( path, &dirFile )) != -1 )
{
do
{
if ( !strcmp( dirFile.name, "." )) continue;
if ( !strcmp( dirFile.name, ".." )) continue;
if ( gIgnoreHidden )
{
if ( dirFile.attrib & _A_HIDDEN ) continue;
if ( dirFile.name[0] == '.' ) continue;
}
// dirFile.name is the name of the file. Do whatever string comparison
// you want here. Something like:
if ( strstr( dirFile.name, ".txt" ))
printf( "found a .txt file: %s", dirFile.name );
} while ( _findnext( hFile, &dirFile ) == 0 );
_findclose( hFile );
}
}
On Posix, like Linux or OsX:
在 Posix 上，如 Linux 或 OsX：
void listFiles( const char* path )
{
DIR* dirFile = opendir( path );
if ( dirFile )
{
struct dirent* hFile;
errno = 0;
while (( hFile = readdir( dirFile )) != NULL )
{
if ( !strcmp( hFile->d_name, "." )) continue;
if ( !strcmp( hFile->d_name, ".." )) continue;
// in linux hidden files all start with '.'
if ( gIgnoreHidden && ( hFile->d_name[0] == '.' )) continue;
// dirFile.name is the name of the file. Do whatever string comparison
// you want here. Something like:
if ( strstr( hFile->d_name, ".txt" ))
printf( "found an .txt file: %s", hFile->d_name );
}
closedir( dirFile );
}
}
回答by sam
Get list of files and process each file and loop through them and store back in different folder
获取文件列表并处理每个文件并遍历它们并存储回不同的文件夹
void getFilesList(string filePath,string extension, vector<string> & returnFileName)
{
WIN32_FIND_DATA fileInfo;
HANDLE hFind;
string fullPath = filePath + extension;
hFind = FindFirstFile(fullPath.c_str(), &fileInfo);
if (hFind != INVALID_HANDLE_VALUE){
returnFileName.push_back(filePath+fileInfo.cFileName);
while (FindNextFile(hFind, &fileInfo) != 0){
returnFileName.push_back(filePath+fileInfo.cFileName);
}
}
}
USE: you can use like this load all the files from folder and loop through one by one
使用：您可以像这样使用从文件夹中加载所有文件并一一循环
String optfileName ="";
String inputFolderPath ="";
String extension = "*.jpg*";
getFilesList(inputFolderPath,extension,filesPaths);
vector<string>::const_iterator it = filesPaths.begin();
while( it != filesPaths.end())
{
frame = imread(*it);//read file names
//doyourwork here ( frame );
sprintf(buf, "%s/Out/%d.jpg", optfileName.c_str(),it->c_str());
imwrite(buf,frame);
it++;
}
回答by crashmstr
You don't say what OS you are on, but there are several options.
你没有说你在什么操作系统上，但有几种选择。
As commenters have mentioned, boost::filesystemwill work if you can use boost.
正如评论者所提到的，如果您可以使用 boost ，boost::filesystem将起作用。
Other options are
其他选项是
