如何在C ++中获取目录中的文件列表？
如何获取目录中的文件列表，以便可以处理每个文件？
DShook asked 2020-07-03T16:14:06Z
13个解决方案
58 votes
这是我使用的：
/* Returns a list of files in a directory (except the ones that begin with a dot) */
void GetFilesInDirectory(std::vector &out, const string &directory)
{
#ifdef WINDOWS
HANDLE dir;
WIN32_FIND_DATA file_data;
if ((dir = FindFirstFile((directory + “/*”).c_str(), &file_data)) == INVALID_HANDLE_VALUE)
return; /* No files found */
do {
const string file_name = file_data.cFileName;
const string full_file_name = directory + “/” + file_name;
const bool is_directory = (file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
if (file_name[0] == ‘.’)
continue;
if (is_directory)
continue;
out.push_back(full_file_name);
} while (FindNextFile(dir, &file_data));
FindClose(dir);
#else
DIR *dir;
class dirent *ent;
class stat st;
dir = opendir(directory);
while ((ent = readdir(dir)) != NULL) {
const string file_name = ent->d_name;
const string full_file_name = directory + “/” + file_name;
if (file_name[0] == ‘.’)
continue;
if (stat(full_file_name.c_str(), &st) == -1)
continue;
const bool is_directory = (st.st_mode & S_IFDIR) != 0;
if (is_directory)
continue;
out.push_back(full_file_name);
}
closedir(dir);
#endif
} // GetFilesInDirectory
Thomas Bonini answered 2020-07-03T16:14:36Z
36 votes
但是boost::filesystem可以做到这一点：[http://www.boost.org/doc/libs/1_37_0/libs/filesystem/example/simple_ls.cpp]
Johannes Schaub – litb answered 2020-07-03T16:14:16Z
26 votes
这是Linux上C语言中的示例。 如果您使用的是Linux，并且不介意在ANSI C中做那么一点。
#include
DIR *dpdf;
struct dirent *epdf;
dpdf = opendir(“./”);
if (dpdf != NULL){
while (epdf = readdir(dpdf)){
printf(“Filename: %s”,epdf->d_name);
// std::cout << epdf->d_name << std::endl;
}
}
closedir(dpdf);
Chris Kloberdanz answered 2020-07-03T16:14:57Z
4 votes
您必须使用操作系统调用(例如Win32 API)或它们周围的包装器。 我倾向于使用Boost.Filesystem，因为与Win32 API(以及跨平台)相比，它是高级接口。
如果您要使用Win32 API，Microsoft会在msdn上列出功能和示例。
Yacoby answered 2020-07-03T16:15:21Z
4 votes
C ++ 11 / Linux版本：
#include
if (auto dir = opendir(“some_dir/”)) {
while (auto f = readdir(dir)) {
if (!f->d_name || f->d_name[0] == ‘.’)
continue; // Skip everything that starts with a dot
printf(“File: %s\n”, f->d_name);
}
closedir(dir);
}
AdrianEddy answered 2020-07-03T16:15:41Z
3 votes
如果您在Windows中并使用MSVC，则MSDN库中有执行此操作的示例代码。
这是该链接中的代码：
#include
#include
#include
#include
void ErrorHandler(LPTSTR lpszFunction);
int _tmain(int argc, TCHAR *argv[])
{
WIN32_FIND_DATA ffd;
LARGE_INTEGER filesize;
TCHAR szDir[MAX_PATH];
size_t length_of_arg;
HANDLE hFind = INVALID_HANDLE_VALUE;
DWORD dwError=0;
// If the directory is not specified as a command-line argument,
// print usage.
if(argc != 2)
{
_tprintf(TEXT(“\nUsage: %s \n”), argv[0]);
return (-1);
}
// Check that the input path plus 2 is not longer than MAX_PATH.
StringCchLength(argv[1], MAX_PATH, &length_of_arg);
if (length_of_arg > (MAX_PATH – 2))
{
_tprintf(TEXT(“\nDirectory path is too long.\n”));
return (-1);
}
_tprintf(TEXT(“\nTarget directory is %s\n\n”), argv[1]);
// Prepare string for use with FindFile functions. First, copy the
// string to a buffer, then append ‘\*’ to the directory name.
StringCchCopy(szDir, MAX_PATH, argv[1]);
StringCchCat(szDir, MAX_PATH, TEXT(“\\*”));
// Find the first file in the directory.
hFind = FindFirstFile(szDir, &ffd);
if (INVALID_HANDLE_VALUE == hFind)
{
ErrorHandler(TEXT(“FindFirstFile”));
return dwError;
}
// List all the files in the directory with some info about them.
do
{
if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
_tprintf(TEXT(” %s
}
else
{
filesize.LowPart = ffd.nFileSizeLow;
filesize.HighPart = ffd.nFileSizeHigh;
_tprintf(TEXT(” %s %ld bytes\n”), ffd.cFileName, filesize.QuadPart);
}
}
while (FindNextFile(hFind, &ffd) != 0);
dwError = GetLastError();
if (dwError != ERROR_NO_MORE_FILES)
{
ErrorHandler(TEXT(“FindFirstFile”));
}
FindClose(hFind);
return dwError;
}
void ErrorHandler(LPTSTR lpszFunction)
{
// Retrieve the system error message for the last-error code
LPVOID lpMsgBuf;
LPVOID lpDisplayBuf;
DWORD dw = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dw,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0, NULL );
// Display the error message and exit the process
lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,
(lstrlen((LPCTSTR)lpMsgBuf)+lstrlen((LPCTSTR)lpszFunction)+40)*sizeof(TCHAR));
StringCchPrintf((LPTSTR)lpDisplayBuf,
LocalSize(lpDisplayBuf) / sizeof(TCHAR),
TEXT(“%s failed with error %d: %s”),
lpszFunction, dw, lpMsgBuf);
MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT(“Error”), MB_OK);
LocalFree(lpMsgBuf);
LocalFree(lpDisplayBuf);
}
John Dibling answered 2020-07-03T16:16:05Z
3 votes
我刚刚问了一个类似的问题，这是基于收到的答案的解决方案(使用boost::filesystem库)：
#include
#include
#include
using namespace std;
using namespace boost::filesystem;
int main()
{
path p(“D:/AnyFolder”);
for (auto i = directory_iterator(p); i != directory_iterator(); i++)
{
if (!is_directory(i->path())) //we eliminate directories in a list
{
cout << i->path().filename().string() << endl;
}
else
continue;
}
}
输出如下：
file1.txt
file2.dat
Bad answered 2020-07-03T16:16:30Z
2 votes
解决此问题需要特定于平台的解决方案。 在unix / linux上寻找opendir()或在Windows上寻找FindFirstFile()。 或者，有许多库将为您处理平台特定的部分。
Roland Rabien answered 2020-07-03T16:16:50Z
1 votes
结合了许多代码片段后，我终于找到了适用于Windows的可重用解决方案，该解决方案使用了Visual Studio附带的ATL库。
#include
void getFiles(CString directory) {
HANDLE dir;
WIN32_FIND_DATA file_data;
CString file_name, full_file_name;
if ((dir = FindFirstFile((directory + “/*”), &file_data)) == INVALID_HANDLE_VALUE)
{
// Invalid directory
}
while (FindNextFile(dir, &file_data)) {
file_name = file_data.cFileName;
full_file_name = directory + file_name;
if (strcmp(file_data.cFileName, “.”) != 0 && strcmp(file_data.cFileName, “..”) != 0)
{
std::string fileName = full_file_name.GetString();
// Do stuff with fileName
}
}
}
要访问该方法，只需调用：
getFiles(“i:\\Folder1”);
Jean Knapp answered 2020-07-03T16:17:15Z
0 votes
或者您执行此操作，然后读出test.txt：
#include
int main() {
system(“dir /b > test.txt”);
}
“ / b”表示仅返回文件名，没有更多信息。
Enders answered 2020-07-03T16:17:39Z
0 votes
HANDLE WINAPI FindFirstFile(
__in LPCTSTR lpFileName,
__out LPWIN32_FIND_DATA lpFindFileData
);
将属性设置为仅查找目录。
kenny answered 2020-07-03T16:17:59Z
0 votes
您可以使用以下代码来获取目录中的所有文件。只需对Andreas Bonini答案进行简单修改即可删除“。”的出现。 和“ ..”
CString dirpath=”d:\\mydir”
DWORD errVal = ERROR_SUCCESS;
HANDLE dir;
WIN32_FIND_DATA file_data;
CString file_name,full_file_name;
if ((dir = FindFirstFile((dirname+ “/*”), &file_data)) == INVALID_HANDLE_VALUE)
{
errVal=ERROR_INVALID_ACCEL_HANDLE;
return errVal;
}
while (FindNextFile(dir, &file_data)) {
file_name = file_data.cFileName;
full_file_name = dirname+ file_name;
if (strcmp(file_data.cFileName, “.”) != 0 && strcmp(file_data.cFileName, “..”) != 0)
{
m_List.AddTail(full_file_name);
}
}
tjdoubts answered 2020-07-03T16:18:20Z
-1 votes
void getFilesList(String filePath,String extension, vector & returnFileName)
{
WIN32_FIND_DATA fileInfo;
HANDLE hFind;
String fullPath = filePath + extension;
hFind = FindFirstFile(fullPath.c_str(), &fileInfo);
if (hFind == INVALID_HANDLE_VALUE){return;}
else {
return FileName.push_back(filePath+fileInfo.cFileName);
while (FindNextFile(hFind, &fileInfo) != 0){
return FileName.push_back(filePath+fileInfo.cFileName);}
}
}
String optfileName =””;
String inputFolderPath =””;
String extension = “*.jpg*”;
getFilesList(inputFolderPath,extension,filesPaths);
vector::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++;
}
sam answered 2020-07-03T16:18:36Z