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CD checking on background

Posted on 2003-11-18
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Last Modified: 2010-04-05
I'm writing a program which should stay invisible on the background and do a check whenever a CD is inserted or changed. For autorun CD's my program should prevent the autorun. Then if the inserted CD contains a certain file (or group of files) the program should perform some actions. Easy example of this could be a window which would automatically pop up and list all files on the root directory of CD with extension *.dpr whenever a CD is changed.

There are certain cases that makes this a bit difficult:

1. If the autoplay is ON the program should catch the QueryCancelAutoPlay Message and not let the autorun application start, but I think that this message gets processed only if my program is active. So the first question is how to make an invisible application to handle this?
2. If the autoplay is OFF the program should check for CD insert notification. Currently my program uses just timer to check for files on the CD every 1000ms, but this is certainly not the best approach.

Sorry for my bad english...

-Jouni-
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Question by:jo_re
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Author Comment

by:jo_re
ID: 9810505
I raised the points for this question because nobody seems to be interested in answering this. I'm sorry if the points are still not enough to get you interested...
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Accepted Solution

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Vihmapuu earned 800 total points
ID: 9826359
type
TMyThread=class(TThread)
  procedure Execute;
end;

procedure TMyThread.Execute;
  begin
    while not Terminated do
      begin
        //do your CD checking here
        Sleep(1000);  //milliseconds of how much you want to wait before next turn
      end;
  end;

begin
  //this is how you would start your thread
  with TMyThread.Create(true) do
    begin
      Priority:=tpLower;
      FreeOnTerminate:=true;
      Resume;
    end;
end;

The code above will create a low priority thread that would be working on background.
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