c++中是否有任何 API用于获取指定文件夹的大小？
如果没有，我怎样才能得到一个文件夹的总大小，包括所有子文件夹和文件？
问问题
20436 次
13 回答
10
让操作系统为你做这件事怎么样：
long long int getFolderSize(string path)
{
// command to be executed
std::string cmd("du -sb ");
cmd.append(path);
cmd.append(" | cut -f1 2>&1");
// execute above command and get the output
FILE *stream = popen(cmd.c_str(), "r");
if (stream) {
const int max_size = 256;
char readbuf[max_size];
if (fgets(readbuf, max_size, stream) != NULL) {
return atoll(readbuf);
}
pclose(stream);
}
// return error val
return -1;
}
于 2013-03-19T11:14:30.210 回答
9
其实我不想使用任何第三方库。只想用纯c++实现。
如果您使用 MSVC++，您将拥有<filesystem>“作为标准 C++”。
但是使用 boost 或 MSVC - 两者都是“纯 C++”。
如果您不想使用 boost，而只有 C++ std:: library 这个答案有点接近。正如您在此处看到的，有一个 Filesystem Library Proposal (Revision 4)。在这里你可以阅读：
该库的 Boost 版本已经广泛使用了十年。该库的 Dinkumware 版本基于 N1975（相当于 Boost 库的第 2 版），随 Microsoft Visual C++ 2012 一起提供。
为了说明使用，我改编了@Nayana Adassuriya的答案，做了非常小的修改（好吧，他忘了初始化一个变量，我使用了unsigned long long，最重要的是使用：path filePath(complete (dirIte->path(), folderPath));在调用其他函数之前恢复完整路径）。我已经测试过，它在 Windows 7 中运行良好。
#include <iostream>
#include <string>
#include <filesystem>
using namespace std;
using namespace std::tr2::sys;
void getFoldersize(string rootFolder,unsigned long long & f_size)
{
path folderPath(rootFolder);
if (exists(folderPath))
{
directory_iterator end_itr;
for (directory_iterator dirIte(rootFolder); dirIte != end_itr; ++dirIte )
{
path filePath(complete (dirIte->path(), folderPath));
try{
if (!is_directory(dirIte->status()) )
{
f_size = f_size + file_size(filePath);
}else
{
getFoldersize(filePath,f_size);
}
}catch(exception& e){ cout << e.what() << endl; }
}
}
}
int main()
{
unsigned long long f_size=0;
getFoldersize("C:\\Silvio",f_size);
cout << f_size << endl;
system("pause");
return 0;
}
于 2013-03-19T14:06:07.833 回答
5
您可以通过这种方式使用 boost。您可以尝试更深入地优化它。
#include <iostream>
#include <string>
#include <boost/filesystem.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/algorithm/string.hpp>
using namespace std;
namespace bsfs = boost::filesystem;
void getFoldersize(string rootFolder,long & file_size){
boost::replace_all(rootFolder, "\\\\", "\\");
bsfs::path folderPath(rootFolder);
if (bsfs::exists(folderPath)){
bsfs::directory_iterator end_itr;
for (bsfs::directory_iterator dirIte(rootFolder); dirIte != end_itr; ++dirIte )
{
bsfs::path filePath(dirIte->path());
try{
if (!bsfs::is_directory(dirIte->status()) )
{
file_size = file_size + bsfs::file_size(filePath);
}else{
getFoldersize(filePath.string(),file_size);
}
}catch(exception& e){
cout << e.what() << endl;
}
}
}
}
int main(){
long file_size =0;
getFoldersize("C:\\logs",file_size);
cout << file_size << endl;
system("pause");
return 0;
}
于 2013-03-19T10:36:43.303 回答
4
文件夹中文件的大小 请查看此链接
#include <iostream>
#include <windows.h>
#include <string>
using namespace std;
__int64 TransverseDirectory(string path)
{
WIN32_FIND_DATA data;
__int64 size = 0;
string fname = path + "\\*.*";
HANDLE h = FindFirstFile(fname.c_str(),&data);
if(h != INVALID_HANDLE_VALUE)
{
do {
if( (data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) )
{
// make sure we skip "." and "..". Have to use strcmp here because
// some file names can start with a dot, so just testing for the
// first dot is not suffient.
if( strcmp(data.cFileName,".") != 0 &&strcmp(data.cFileName,"..") != 0)
{
// We found a sub-directory, so get the files in it too
fname = path + "\\" + data.cFileName;
// recurrsion here!
size += TransverseDirectory(fname);
}
}
else
{
LARGE_INTEGER sz;
// All we want here is the file size. Since file sizes can be larger
// than 2 gig, the size is reported as two DWORD objects. Below we
// combine them to make one 64-bit integer.
sz.LowPart = data.nFileSizeLow;
sz.HighPart = data.nFileSizeHigh;
size += sz.QuadPart;
}
}while( FindNextFile(h,&data) != 0);
FindClose(h);
}
return size;
}
int main(int argc, char* argv[])
{
__int64 size = 0;
string path;
size = TransverseDirectory("c:\\dvlp");
cout << "\n\nDirectory Size = " << size << "\n";
cin.ignore();
return 0;
}
更多详情请点击这里
于 2013-03-19T09:36:00.357 回答
3
这样的事情会更好地避免添加符号（软）链接：
std::uintmax_t directorySize(const std::filesystem::path& directory)
{
std::uintmax_t size{ 0 };
for (const auto& entry : std::filesystem::recursive_directory_iterator(directory))
{
if (entry.is_regular_file() && !entry.is_symlink())
{
size += entry.file_size();
}
}
return size;
}
于 2020-06-22T19:49:43.023 回答
1
文件系统函数是每个操作系统的组成部分，主要是用 C 和汇编程序而不是 C++ 编写的，为此的每个 C++ 库实现都以某种方式封装了这些函数。考虑一下努力，如果您不会在不同的操作系统中使用您的实现，那么直接使用这些功能并节省一些开销和时间可能是一个好主意。
最好的祝福。
于 2013-03-19T14:25:44.407 回答
1
我有我的类型定义文件：
typedef std::wstring String;
typedef std::vector<String> StringVector;
typedef unsigned long long uint64_t;
代码是：
uint64_t CalculateDirSize(const String &path, StringVector *errVect = NULL, uint64_t size = 0)
{
WIN32_FIND_DATA data;
HANDLE sh = NULL;
sh = FindFirstFile((path + L"\\*").c_str(), &data);
if (sh == INVALID_HANDLE_VALUE )
{
//if we want, store all happened error
if (errVect != NULL)
errVect ->push_back(path);
return size;
}
do
{
// skip current and parent
if (!IsBrowsePath(data.cFileName))
{
// if found object is ...
if ((data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)
// directory, then search it recursievly
size = CalculateDirSize(path + L"\\" + data.cFileName, NULL, size);
else
// otherwise get object size and add it to directory size
size += (uint64_t) (data.nFileSizeHigh * (MAXDWORD ) + data.nFileSizeLow);
}
} while (FindNextFile(sh, &data)); // do
FindClose(sh);
return size;
}
bool IsBrowsePath(const String& path)
{
return (path == _T(".") || path == _T(".."));
}
如果需要，这使用 UNICODE 并返回失败的目录。
调用使用：
StringVector vect;
CalculateDirSize(L"C:\\boost_1_52_0", &vect);
CalculateDirSize(L"C:\\boost_1_52_0");
但永远不会通过size
于 2013-07-25T13:43:24.620 回答
1
//use FAT32
#undef UNICODE // to flag window deactive unicode
#include<Windows.h> //to use windows api
#include<iostream>
#include<iomanip>
#include<cstring>
#include<string>
#include<algorithm>
using namespace std;
#pragma pack(1) //tell compiler do'nt do prag
struct BPB
{
BYTE JMP[3];
BYTE OEM[8];
WORD NumberOfBytesPerSector;
BYTE NumberOfSectorsPerCluster;
WORD NumberOfReservedSectors;
BYTE NumberOfFATs;
WORD NumberOfRootEntries16;
WORD LowNumbferOfSectors;
BYTE MediaDescriptor;
WORD NumberOfSectorsPerFAT16;
WORD NumberOfSectorsPerTrack;
WORD NumberOfHeads;
DWORD NumberOfHiddenSectors;
DWORD HighNumberOfSectors;
DWORD NumberOfSectorsPerFAT32;
WORD Flags;
WORD FATVersionNumber;
DWORD RootDirectoryClusterNumber;
WORD FSInfoSector;
WORD BackupSector;
BYTE Reserver[12];
BYTE BiosDrive;
BYTE WindowsNTFlag;
BYTE Signature;
DWORD VolumeSerial;
BYTE VolumeLabel[11];
BYTE SystemID[8];
BYTE CODE[420];
WORD BPBSignature;
};
//-----------------------------------------------------------
struct DirectoryEntry
{
BYTE Name[11];
BYTE Attributes;
BYTE Reserved;
BYTE CreationTimeTenth;
WORD CreationTime;
WORD CreationDate;
WORD LastAccessTime;
WORD HiClusterNumber;
WORD WriteTime;
WORD WriteDate;
WORD LowClusterNumber;
DWORD FileSize; //acual size of file
};
//---------------------------------------------------
void dirFunction(string s){
string path = "\\\\.\\" + s + ":";
HANDLE hFile = CreateFile(path.c_str(), GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0);//open partition
BPB bootSector;//var from bootSector structure
DWORD readBytes = 0;
if (hFile == INVALID_HANDLE_VALUE)
{
cout << "Error " << GetLastError()<<endl;
return;
}
ReadFile(hFile, (BYTE*)&bootSector, sizeof(bootSector), &readBytes, 0);//read partition and load bootSector information inside our structure
LONG t = 0;
ULONG distance = bootSector.NumberOfReservedSectors +
bootSector.NumberOfFATs*bootSector.NumberOfSectorsPerFAT32;//distance from begine until Root Directory or content of partetion
distance *= bootSector.NumberOfBytesPerSector;//convert distance number to bytes value
SetFilePointer(hFile, distance, &t, FILE_BEGIN);//set pointer to root directory begine or begine of data
int clusterSize = bootSector.NumberOfBytesPerSector*bootSector.NumberOfSectorsPerCluster; //cluster size
int NumberOfEntries = clusterSize / sizeof(DirectoryEntry); //number of record inside cluster
DirectoryEntry* root = new DirectoryEntry[NumberOfEntries];//descripe the partetion
ReadFile(hFile, (BYTE*)root, clusterSize, &readBytes, 0);
DWORD clusterNumber;
for (int i = 0; i < NumberOfEntries; i++)
{
if (root[i].Name[0] == 0)//there no entery after this
break;
if (root[i].Name[0] == 0xE5)
continue;
if ((root[i].Attributes & 0xF) == 0xF)
continue;
for (int j = 0; j < 8; j++)
cout << root[i].Name[j];
if((root[i].Attributes & 0x10) != 0x10){
cout<<".";
for (int j = 8; j < 11; j++)
cout << root[i].Name[j];
}
if ((root[i].Attributes & 0x10) == 0x10){
cout << "\t<Folder>" ;
}else{
cout<<"\t<File>" ;
}
clusterNumber = root[i].HiClusterNumber << 16;
clusterNumber |= root[i].LowClusterNumber;
cout <<"\t"<<root[i].FileSize<<"bytes" << "\t" << clusterNumber<<"cluster" << endl;
}
CloseHandle(hFile);
}
//---------------------------------------------------------------
string convertLowerToUpper(string f){
string temp = "";
for (int i = 0; i < f.size(); i++){
temp += toupper(f[i]);
}
return temp;
}
//---------------------------------------------------------------
string getFileName(BYTE filename[11]){
string name = "";
for (int i = 0; i < 8; i++){
if (filename[i] != ' ')
name += filename[i];
}
return (name);
}
//------------------------------------------------------------------
int findEntryNumber(DirectoryEntry* root, int NumberOfEntries, string required){
string n;
int j = 0;
for (int i = 0; i < NumberOfEntries; i++){
if (strcmp((getFileName(root[i].Name).c_str()), convertLowerToUpper(required).c_str()) == 0){
return i;
}
}
return -1;
}
//---------------------------------------------------------------
void typeFunction(string fileName, string s){
string path = "\\\\.\\" + s + ":";
HANDLE hFile = CreateFile(path.c_str(), GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0);//open partition
BPB bootSector;//var from bootSector structure
DWORD readBytes = 0;
if (hFile == INVALID_HANDLE_VALUE)
{
cout << "Error " << GetLastError()<<endl;
return;
}
ReadFile(hFile, (BYTE*)&bootSector, sizeof(bootSector), &readBytes, 0);//read partition and load bootSector information inside our structure
LONG t = 0;
ULONG distance = bootSector.NumberOfReservedSectors +
bootSector.NumberOfFATs*bootSector.NumberOfSectorsPerFAT32;//distance from begine until Root Directory or content of partetion
distance *= bootSector.NumberOfBytesPerSector;//convert distance number to bytes value
SetFilePointer(hFile, distance, &t, FILE_BEGIN);//set pointer to root directory begine or begine of data
int clusterSize = bootSector.NumberOfBytesPerSector*bootSector.NumberOfSectorsPerCluster; //cluster size
int NumberOfEntries = clusterSize / sizeof(DirectoryEntry); //number of record inside cluster
DirectoryEntry* root = new DirectoryEntry[NumberOfEntries];//descripe the partetion
ReadFile(hFile, (BYTE*)root, clusterSize, &readBytes, 0);
DWORD clusterNumber;
int index = findEntryNumber(root, NumberOfEntries, fileName);
if (index == -1){
cout << "File is not found" << endl;
return;
}
if (((root[index].Attributes & 0x10) == 0x10) ){
cout << "Is not file name" << endl;
return;
}
clusterNumber = root[index].HiClusterNumber << 16;
clusterNumber |= root[index].LowClusterNumber;
ULONG temp = (clusterNumber - 2) * clusterSize;
distance += temp;
t = 0;
SetFilePointer(hFile, distance, &t, FILE_BEGIN);
BYTE* buffer = new BYTE[clusterSize];
readBytes = 0;
ReadFile(hFile, (BYTE*)buffer, clusterSize, &readBytes, 0);
for (int i = 0; i < root[index].FileSize; i++){
cout << buffer[i];
}
cout << endl;
CloseHandle(hFile);
}
//----------------------------------------------------------------------
void delFunction(string filename, string s){
string path = "\\\\.\\" + s + ":";
HANDLE hFile = CreateFile(path.c_str(), GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0);//open partition
BPB bootSector;//var from bootSector structure
DWORD readBytes = 0;
if (hFile == INVALID_HANDLE_VALUE)
{
cout << "Error " << GetLastError()<<endl;
return;
}
ReadFile(hFile, (BYTE*)&bootSector, sizeof(bootSector), &readBytes, 0);//read partition and load bootSector information inside our structure
LONG t = 0;
ULONG distance = bootSector.NumberOfReservedSectors +
bootSector.NumberOfFATs*bootSector.NumberOfSectorsPerFAT32;//distance from begine until Root Directory or content of partetion
distance *= bootSector.NumberOfBytesPerSector;//convert distance number to bytes value
SetFilePointer(hFile, distance, &t, FILE_BEGIN);//set pointer to root directory begine or begine of data
int clusterSize = bootSector.NumberOfBytesPerSector*bootSector.NumberOfSectorsPerCluster; //cluster size
int NumberOfEntries = clusterSize / sizeof(DirectoryEntry); //number of record inside cluster
DirectoryEntry* root = new DirectoryEntry[NumberOfEntries];//descripe the partetion
ReadFile(hFile, (BYTE*)root, clusterSize, &readBytes, 0);
DWORD clusterNumber;
readBytes = 0;
t = 0;
int index = findEntryNumber(root, NumberOfEntries, filename);
if (index == -1){
cout << "FIle is not found" << endl;
return;
}
if ((root[index].Attributes & 0x10) == 0x10){
cout << "Is not file name" << endl;
return;
}
//delete file
root[index].Name[0] = 0xE5;
SetFilePointer(hFile, distance, &t, FILE_BEGIN);
WriteFile(hFile, (BYTE*)root, clusterSize, &readBytes, 0);
cout<<filename<<" is deleted\n";
CloseHandle(hFile);
}
//----------------------------------------------------------------------
string removeExtention(string s){
string t = "";
for (int i = 0; i < s.size(); i++){
if (s[i] == '.')break;
t += s[i];
}
return t;
}
//-------------------------------------------------------------------
void main()
{
string swich_value;
string directory;
string file_name;
//dirFunction("G");
cout<<"plz, Enter single Partition character ------> example E or G\n\n";
cin>>directory;
string path = "\\\\.\\" + directory + ":";
cout<<"current directory is "<<path<<endl;
cout<<"Enter Options: \n1- dir \n2- type file_name.extention \n3- del file_name.extention\n\n";
again:
cin>>swich_value;
if(swich_value.at(1)!='i')
cin>>file_name;
string answer;
switch(swich_value.at(1)){
case 'i':
dirFunction(directory);
cout<<"\nare you want to do another process: y or n?";
cin>>answer;
if (answer.at(0)=='y')
goto again;
break;
case 'y':
typeFunction(removeExtention(file_name), directory);
cout<<"\nare you want to do another process: y or n?";
cin>>answer;
if (answer.at(0)=='y')
goto again;
break;
case 'e':
delFunction(removeExtention(file_name), directory);
cout<<"\nare you want to do another process: y or n?";
cin>>answer;
if (answer.at(0)=='y')
goto again;
break;
}
}
于 2015-11-26T22:46:47.177 回答
1
您可以使用“boost::filesystem”
#include <boost/filesystem.hpp>
namespace fs = boost::filesystem;
unsigned long long int get_directory_size(const fs::path& directory){
if (!fs::exists(directory)) return 0;
if (fs::is_directory(directory)){
unsigned long long int ret_size = 0;
fs::directory_iterator m_dir_itr(directory);
for (m_dir_itr = fs::begin(m_dir_itr); m_dir_itr != fs::end(m_dir_itr); ++m_dir_itr){
fs::directory_entry m_dir_entry = *m_dir_itr;
if (fs::is_regular_file(m_dir_entry.path())){
ret_size += fs::file_size(m_dir_entry.path());
}else if (fs::is_directory(m_dir_entry.path())){
ret_size += get_directory_size(m_dir_entry.path());
}
}
return ret_size;
} else if (fs::is_regular_file(directory)){
return fs::file_size(directory);
}
return 0;
}
#include <stdio.h>
int main(int /*argc*/, char** /*argv*/) {
// Assuming 'C:/Folder' be any directory then its size can be found using
auto folder_size = get_directory_size("C:/Folder");
printf("Size of 'C:/Folder' is %d\n",folder_size);
return 0;
}
于 2017-11-05T05:18:40.300 回答
1
随着 的引入std::filesystem，您不再需要使用任何系统 API 或任何外部库。
#include <filesystem>
namespace n_fs = ::std::filesystem;
double archive::getFolderSize(std::string path)
{
double r = 0.0;
try{
if (!n_fs::is_directory(path))
{
r += (double)n_fs::file_size(path);
}
else
{
for(auto entry: n_fs::directory_iterator(path))
getFolderSize(entry.path().string());
}
}
catch(exception& e)
{
std::cout << e.what() << std::endl();
}
return r;
}
int main(){
double folderSize = getFolderSize("~/dev/"); //Replace with your path
std::cout << "Size of Folder: " << folderSize;
}
于 2019-04-27T11:49:24.127 回答
0
尝试使用 GetFileSizeEx 函数。以下是一些示例代码。不过，您需要从 LARGE_INTEGER 联合中获取大小。
#include <iostream>
#include <windows.h>
#include <stdio.h>
#include <io.h>
using namespace std;
int main()
{
FILE *fp;
fp = fopen("C:\test.txt","r");
int fileNo = _fileno(fp);
HANDLE cLibHandle = (HANDLE)_get_osfhandle(fileNo);
long int fileSize = 0;
LARGE_INTEGER fileSizeL;
GetFileSizeEx(cLibHandle, &fileSizeL);
return 0;
}
于 2013-03-19T10:54:18.480 回答
0
5 年，而不是标准 C++ 的简单解决方案，这就是为什么我想为这个问题贡献我的解决方案：
uint64_t GetDirSize(const std::string &path)
{
uint64_t size = 0;
for (const auto & entry : std::experimental::filesystem::directory_iterator(path))
{
if(entry.status().type() == std::experimental::filesystem::file_type::regular)
size += std::experimental::filesystem::file_size(entry.path());
if (entry.status().type() == std::experimental::filesystem::file_type::directory)
size += GetDirSize(entry.path().generic_string());
}
return size;
}
例如，
GetDirSize("C:\\dir_name")
如果您使用的是 Windows，请通过调用来使用它。
于 2019-03-08T17:16:07.957 回答
0
在 Windows 上计算文件夹大小（以字节为单位）。
size_t GetFolderSizeInBytes(std::wstring path)
{
size_t result = 0;
WIN32_FIND_DATA findData;
HANDLE hFileHandle;
std::wstring sourcePath(path);
if (GetFileAttributes(sourcePath.c_str()) & FILE_ATTRIBUTE_DIRECTORY)
sourcePath.push_back(L'\\');
std::wstring fileName(sourcePath);
fileName.append(L"*");
hFileHandle = FindFirstFileEx(
fileName.data(),
FindExInfoStandard,
&findData,
FindExSearchNameMatch,
NULL,
FIND_FIRST_EX_ON_DISK_ENTRIES_ONLY);
if (hFileHandle != INVALID_HANDLE_VALUE)
{
do
{
if (!wcscmp(findData.cFileName, L".") || !wcscmp(findData.cFileName, L".."))
continue;
if ((findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
{
// Folder
std::wstring newPath = path + L"\\" + findData.cFileName;
result += GetFolderSizeInBytes(newPath);
}
else
{
// File
unsigned long high = findData.nFileSizeHigh;
unsigned long low = findData.nFileSizeLow;
size_t size = size_t(high * (MAXWORD + 1)) + low;
result += size;
}
} while (FindNextFile(hFileHandle, &findData));
FindClose(hFileHandle);
}
return result;
}
于 2021-07-15T21:28:47.883 回答