我想获取给定文件夹中具有特定扩展名的所有文件的文件名（并递归地，其子文件夹）。也就是说，文件名（和扩展名），而不是完整的文件路径。这在Python等语言中非常简单，但我不熟悉C ++中的构造。怎么做到呢？
#define BOOST_FILESYSTEM_VERSION 3
#define BOOST_FILESYSTEM_NO_DEPRECATED
#include <boost/filesystem.hpp>
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;
}
}
在Windows上你做这样的事情：
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 );
}
}
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 );
}
}
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;
}
获取文件列表并处理每个文件并循环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);
}
}
}
使用：您可以像这样使用加载文件夹中的所有文件并逐个循环
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++;
}