问题
How can I delete a folder using C++?
If no cross-platform way exists, then how to do it for the most-popular OSes - Windows, Linux, Mac, iOS, Android? Would a POSIX solution work for all of them?
回答1:
I strongly advise to use Boost.FileSystem.
http://www.boost.org/doc/libs/1_38_0/libs/filesystem/doc/index.htm
In your case that would be
boost::filesystem::remove_all(yourPath)
回答2:
Delete folder (sub_folders and files) in Windows (VisualC++) not using Shell APIs, this is the best working sample:
#include <string>
#include <iostream>
#include <windows.h>
#include <conio.h>
int DeleteDirectory(const std::string &refcstrRootDirectory,
bool bDeleteSubdirectories = true)
{
bool bSubdirectory = false; // Flag, indicating whether
// subdirectories have been found
HANDLE hFile; // Handle to directory
std::string strFilePath; // Filepath
std::string strPattern; // Pattern
WIN32_FIND_DATA FileInformation; // File information
strPattern = refcstrRootDirectory + "\\*.*";
hFile = ::FindFirstFile(strPattern.c_str(), &FileInformation);
if(hFile != INVALID_HANDLE_VALUE)
{
do
{
if(FileInformation.cFileName[0] != '.')
{
strFilePath.erase();
strFilePath = refcstrRootDirectory + "\\" + FileInformation.cFileName;
if(FileInformation.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
if(bDeleteSubdirectories)
{
// Delete subdirectory
int iRC = DeleteDirectory(strFilePath, bDeleteSubdirectories);
if(iRC)
return iRC;
}
else
bSubdirectory = true;
}
else
{
// Set file attributes
if(::SetFileAttributes(strFilePath.c_str(),
FILE_ATTRIBUTE_NORMAL) == FALSE)
return ::GetLastError();
// Delete file
if(::DeleteFile(strFilePath.c_str()) == FALSE)
return ::GetLastError();
}
}
} while(::FindNextFile(hFile, &FileInformation) == TRUE);
// Close handle
::FindClose(hFile);
DWORD dwError = ::GetLastError();
if(dwError != ERROR_NO_MORE_FILES)
return dwError;
else
{
if(!bSubdirectory)
{
// Set directory attributes
if(::SetFileAttributes(refcstrRootDirectory.c_str(),
FILE_ATTRIBUTE_NORMAL) == FALSE)
return ::GetLastError();
// Delete directory
if(::RemoveDirectory(refcstrRootDirectory.c_str()) == FALSE)
return ::GetLastError();
}
}
}
return 0;
}
int main()
{
int iRC = 0;
std::string strDirectoryToDelete = "c:\\mydir";
// Delete 'c:\mydir' without deleting the subdirectories
iRC = DeleteDirectory(strDirectoryToDelete, false);
if(iRC)
{
std::cout << "Error " << iRC << std::endl;
return -1;
}
// Delete 'c:\mydir' and its subdirectories
iRC = DeleteDirectory(strDirectoryToDelete);
if(iRC)
{
std::cout << "Error " << iRC << std::endl;
return -1;
}
// Wait for keystroke
_getch();
return 0;
}
Source: http://www.codeguru.com/forum/showthread.php?t=239271
回答3:
With C++17 you can use std::filesystem, in C++14 std::experimental::filesystem is already available. Both allow the usage of filesystem::remove().
C++17:
#include <filesystem>
std::filesystem::remove("myEmptyDirectoryOrFile"); // Deletes empty directories or single files.
std::filesystem::remove_all("myDirectory"); // Deletes one or more files recursively.
C++14:
#include <experimental/filesystem>
std::experimental::filesystem::remove("myDirectory");
Note 1: Those functions throw filesystem_error in case of errors. If you want to avoid catching exceptions, use the overloaded variants with std::error_code as second parameter. E.g.
std::error_code errorCode;
if (!std::filesystem::remove("myEmptyDirectoryOrFile", errorCode)) {
std::cout << errorCode.message() << std::endl;
}
Note 2: The conversion to std::filesystem::path happens implicit from different encodings, so you can pass strings to filesystem::remove().
回答4:
The directory should be empty.
BOOL RemoveDirectory( LPCTSTR lpPathName );
回答5:
void remove_dir(char *path)
{
struct dirent *entry = NULL;
DIR *dir = NULL;
dir = opendir(path);
while(entry = readdir(dir))
{
DIR *sub_dir = NULL;
FILE *file = NULL;
char abs_path[100] = {0};
if(*(entry->d_name) != '.')
{
sprintf(abs_path, "%s/%s", path, entry->d_name);
if(sub_dir = opendir(abs_path))
{
closedir(sub_dir);
remove_dir(abs_path);
}
else
{
if(file = fopen(abs_path, "r"))
{
fclose(file);
remove(abs_path);
}
}
}
}
remove(path);
}
回答6:
Use SHFileOperation to remove the folder recursivelly
回答7:
The directory must be empty and your program must have permissions to delete it
but the function called rmdir will do it
rmdir("C:/Documents and Settings/user/Desktop/itsme")
回答8:
You can also try this if you are on linux:
system("rm -r path");
回答9:
The C++ Standard defines the remove() function, which may or may not delete a folder, depending on implementation. If it doesn't you need to use an implementation specific function such as rmdir().
回答10:
//For windows:
#include <direct.h>
if(_rmdir("FILEPATHHERE") != -1)
{
//success
} else {
//failure
}
回答11:
Try use system "rmdir -s -q file_to_delte".
This will delete the folder and all files in it.
回答12:
My own implementation based off hB0 that also allows you to view the number of files in each folder also with a little performance boost.
#include <string>
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <windows.h>
#include <conio.h>
union seperated {
struct {
unsigned int low;
unsigned int high;
} uint;
unsigned long long ull;
};
unsigned long long num_dirs = 1;
unsigned long long num_files = 0;
seperated size_files;
int DeleteDirectory( char* refRootDirectory ); //predeclare it
int DeleteDirectory( char* refRootDirectory ) {
HANDLE hFile; // Handle to directory
std::string strFilePath; // Filepath
WIN32_FIND_DATA FileInformation; // File information
int dwError; // Folder deleting error
std::string strPattern; // Pattern
strPattern = (std::string)(refRootDirectory) + "\\*.*";
hFile = ::FindFirstFile( strPattern.c_str(), &FileInformation );
if( hFile != INVALID_HANDLE_VALUE )
{
do {
if( FileInformation.cFileName[0] != '.' ) {
strFilePath.erase();
strFilePath = std::string(refRootDirectory) + "\\" + FileInformation.cFileName;
if( FileInformation.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) {
DeleteDirectory( (char*)strFilePath.c_str() );
dwError = ::GetLastError();
if( dwError != ERROR_NO_MORE_FILES ) {
std::cout << "!ERROR!: [[" << strFilePath.c_str() << "]]\n";
return dwError;
} else {
// Set directory attributes
if( ! ::SetFileAttributes(refRootDirectory,FILE_ATTRIBUTE_NORMAL) ) {
std::cout << "!ERROR!: [[" << strFilePath.c_str() << "]]\n";
return ::GetLastError();
}
// Delete directory
if( ! ::RemoveDirectory(refRootDirectory) ) {
std::cout << "!ERROR!: [[" << strFilePath.c_str() << "]]\n";
return ::GetLastError();
}
}
++num_dirs;
} else {
// Set file attributes
if( ! ::SetFileAttributes(strFilePath.c_str(),FILE_ATTRIBUTE_NORMAL) ) {
std::cout << "!ERROR!: [[" << strFilePath.c_str() << "]]\n";
return ::GetLastError();
}
// Delete file
if ( ! ::DeleteFile(strFilePath.c_str()) ) {
std::cout << "!ERROR!: [[" << strFilePath.c_str() << "]]\n";
return ::GetLastError();
}
size_files.ull += FileInformation.nFileSizeLow;
size_files.uint.high += FileInformation.nFileSizeHigh;
++num_files;
}
}
} while( ::FindNextFile(hFile,&FileInformation) );
// Close handle
::FindClose( hFile );
}
return 0;
}
unsigned long long num_files_total=0;
unsigned long long num_dirs_total=0;
unsigned long long total_size_files=0;
void my_del_directory( char* dir_name ) {
int iRC = DeleteDirectory( dir_name );
//int iRC=0;
std::cout << "\"" << dir_name << "\""
"\n Folders: " << num_dirs
<< "\n Files: " << num_files
<< "\n Size: " << size_files.ull << " Bytes";
if(iRC)
{
std::cout << "\n!ERROR!: " << iRC;
}
std::cout << "\n\n";
num_dirs_total += num_dirs;
num_files_total += num_files;
total_size_files += size_files.ull;
num_dirs = 1;
num_files = 0;
size_files.ull = 0ULL;
return;
}
int main( void )
{
size_files.ull = 0ULL;
my_del_directory( (char*)"C:\Windows\temp" );
// This will clear out the System temporary directory on windows systems
std::cout << "\n\nResults" << "\nTotal Folders: " << num_dirs_total
<< "\nTotal Files: " << num_files_total
<< "\nTotal Size: " << total_size_files << " Bytes\n";
return 0;
}
回答13:
For linux (I have fixed bugs in code above):
void remove_dir(char *path)
{
struct dirent *entry = NULL;
DIR *dir = NULL;
dir = opendir(path);
while(entry = readdir(dir))
{
DIR *sub_dir = NULL;
FILE *file = NULL;
char* abs_path new char[256];
if ((*(entry->d_name) != '.') || ((strlen(entry->d_name) > 1) && (entry->d_name[1] != '.')))
{
sprintf(abs_path, "%s/%s", path, entry->d_name);
if(sub_dir = opendir(abs_path))
{
closedir(sub_dir);
remove_dir(abs_path);
}
else
{
if(file = fopen(abs_path, "r"))
{
fclose(file);
remove(abs_path);
}
}
}
delete[] abs_path;
}
remove(path);
}
For windows:
void remove_dir(const wchar_t* folder)
{
std::wstring search_path = std::wstring(folder) + _T("/*.*");
std::wstring s_p = std::wstring(folder) + _T("/");
WIN32_FIND_DATA fd;
HANDLE hFind = ::FindFirstFile(search_path.c_str(), &fd);
if (hFind != INVALID_HANDLE_VALUE) {
do {
if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
if (wcscmp(fd.cFileName, _T(".")) != 0 && wcscmp(fd.cFileName, _T("..")) != 0)
{
remove_dir((wchar_t*)(s_p + fd.cFileName).c_str());
}
}
else {
DeleteFile((s_p + fd.cFileName).c_str());
}
} while (::FindNextFile(hFind, &fd));
::FindClose(hFind);
_wrmdir(folder);
}
}
回答14:
If you are using the Poco library, here is a portable way to delete a directory.
#include "Poco/File.h"
...
...
Poco::File fooDir("/path/to/your/dir");
fooDir.remove(true);
The remove function when called with "true" means recursively delete all files and sub directories in a directory.
回答15:
If you are using windows, then take a look at this link. Otherwise, you may look for your OS specific version api. I don't think C++ comes with a cross-platform way to do it. At the end, it's NOT C++'s work, it's the OS's work.
来源：https://stackoverflow.com/questions/734717/how-to-delete-a-folder-in-c