How can I find the size of all files located inside a folder?

Question

Is there any API in c++ for getting the size of a specified folder?

If not, how can I get the total size of a folder including all subfolders and files?

Answer 1

I have my types definition file with:

typedef std::wstring String;
typedef std::vector StringVector;
typedef unsigned long long uint64_t;

and code is:

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(".."));
}

This uses UNICODE and returns failed dirs if you want that.

To call use:

StringVector vect;
CalculateDirSize(L"C:\\boost_1_52_0", &vect);
CalculateDirSize(L"C:\\boost_1_52_0");

But never pass size