public static NT_FILE_BASIC_INFO GetFileInfo_basic(string file_name)
{
IntPtr file_handle = IntPtr.Zero;
try
{
//open file
file_handle = WinApiFS.CreateFile_intptr
(file_name,
Win32FileAccess.GENERIC_READ,
FileShare.ReadWrite,
IntPtr.Zero,
FileMode.Open,
CreateFileOptions.BACKUP_SEMANTICS,
IntPtr.Zero);
if (file_handle.ToInt32() == WinApiFS.INVALID_HANDLE_VALUE)
{
int win_err = Marshal.GetLastWin32Error();
Exception ex = new Win32Exception(win_err);
throw ex;
}
NT_FILE_BASIC_INFO ret = GetFileInfo_basic(file_handle);
return(ret);
}
finally
{
if ((file_handle != IntPtr.Zero) && (file_handle.ToInt32() != WinApiFS.INVALID_HANDLE_VALUE))
{
WinApiFS.CloseHandle(file_handle);
}
}
}
public static NT_FILE_BASIC_INFO GetFileInfo_basic(IntPtr file_handle)
{
IntPtr ret_ptr = IntPtr.Zero;
try
{
//нинциализируем IO_STATUS
IO_STATUS_BLOCK status_block = new IO_STATUS_BLOCK();
//инициализируем NT_FILE_BASIC_INFO
int ret_len = Marshal.SizeOf(typeof(NT_FILE_BASIC_INFO));
ret_ptr = Marshal.AllocHGlobal(ret_len);
//вызываем - по некторым сведениям вызов может в некоторых случаях блокироваться до
//бесконечности!
uint res = ntApiFS.NtQueryInformationFile
(file_handle,
ref status_block,
ret_ptr,
ret_len,
FILE_INFORMATION_CLASS.FileBasicInformation);
//обрабатываем исключения
NTSTATUS_helper.ThrowOnError(res, status_block, NTSTATUS_severity.Warning);
//получаем управляемую структуру из указателя
NT_FILE_BASIC_INFO ret = (NT_FILE_BASIC_INFO)Marshal.PtrToStructure
(ret_ptr,
typeof(NT_FILE_BASIC_INFO));
return(ret);
}
finally
{
if (ret_ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(ret_ptr);
}
}
}
