BOOL GetPathFreeSpace(LPCTSTR szPath, LARGE_INTEGER& liSize, DWORD *dwErr)
{
    liSize.LowPart  =  0 ;
    liSize.HighPart =  0 ;

    HMODULE hm = ::GetModuleHandle(TEXT("KERNEL32.DLL"));
    if(hm !=  0 )
	{
        typedef BOOL (WINAPI *GDFSEx)(LPCSTR,PULARGE_INTEGER, PULARGE_INTEGER, PULARGE_INTEGER);
        GDFSEx func = (GDFSEx)GetProcAddress(hm,"GetDiskFreeSpaceExA");
        if(func) 
		{
            ULARGE_INTEGER liFreeAvailable, liTotal;
            if(func(szPath, &liFreeAvailable, &liTotal, NULL)) 
			{
                liSize.QuadPart = liFreeAvailable.QuadPart;
                return TRUE;
            }
        }
    }
	*dwErr = GetLastError();

    return FALSE;
}