From: "patrick allen" <pallen@fred.net>
Newsgroups: borland.public.delphi.vcl.components.using
References: <3b0dda39_1@dnews>
Subject: Re: DriveComboBox "I/O Error 21"
Date: Mon, 28 May 2001 22:42:01 -0400
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kai,

the following event handler responds to the drive box change event and
handles the IO21 error gracefully.

procedure TForm1.MydrivecomboboxChange(Sender: TObject);
begin
  try
    Mydirectorylistbox.drive := Mydrivecombobox.drive;
  except on EInOutError do
    messagedlg(#13 + 'the selected drive, or device is not ready'+ #13,
mtwarning, [mbok], 0);
  end;
end;

...good luck, patrick

Kai Peters <kpeters@otaksoft.com> wrote in message news:3b0dda39_1@dnews...
> When I cursor onto an  inaccessible drive (ie  CDROM drive), I  encounter
> this error.  Is there a way to handle this before it turns ugly?  (Please
> note: I have to use a drivecombobox.  A Browse for folder dialog is NOT an
> option).  I was not able to capture the error through the OnChange or
> KeyDown events
>
> TIA
>
> Darrell Funk