private string FindFirstVolume()
{
// Need at least some length on initial call or we'll get ERROR_INVALID_PARAMETER
_buffer.EnsureCharCapacity(400);
_findHandle = VolumeMethods.Imports.FindFirstVolumeMountPointW(
_volumeName,
_buffer,
_buffer.CharCapacity);
if (_findHandle.IsInvalid)
{
WindowsError error = Errors.GetLastError();
switch (error)
{
// Not positive on this case as I haven't been able to get this API
// to fully work correctly yet.
case WindowsError.ERROR_MORE_DATA:
_buffer.EnsureCharCapacity(_buffer.CharCapacity + 64);
return(FindFirstVolume());
case WindowsError.ERROR_NO_MORE_FILES:
_lastEntryFound = true;
return(null);
default:
throw Errors.GetIoExceptionForError(error);
}
}
_buffer.SetLengthToFirstNull();
return(_buffer.ToString());
}
public static extern bool FindNextVolumeMountPointW(
FindVolumeMountPointHandle hFindVolumeMountPoint,
SafeHandle lpszVolumeMountPoint,
uint cchBufferLength);
private void CloseHandle()
{
_findHandle?.Dispose();
_findHandle = null;
}
