public bool MoveNext()
{
int err_code = 0;
int res = 0;
if (search_handle == IntPtr.Zero)
{
search_handle = WinApiFS.FindFirstVolumeMountPoint(volume_guid, mount_point_buffer, mount_point_buffer_len_tchars);
if (search_handle.ToInt32() == WinApiFS.INVALID_HANDLE_VALUE)
{
err_code = Marshal.GetLastWin32Error();
if (err_code == 18)
{
//no more files
return(false);
}
else if (err_code == 21)
{
//device not ready
return(false);
}
else
{
throw new Win32Exception(err_code);
}
}
else
{
return(true);
}
}
else
{
res = WinApiFS.FindNextVolumeMountPoint(search_handle, mount_point_buffer, mount_point_buffer_len_tchars);
if (res == 0)
{
err_code = Marshal.GetLastWin32Error();
if (err_code == 18)
{
//no more files
return(false);
}
else
{
throw new Win32Exception(err_code);
}
}
else
{
return(true);
}
}
}