[DUG] Is it a bug in latest version of Delphi? - Solution

[Rohit Gupta]

Sinu,

I dont know if its been answered satisfactorily.  There are too many 
replies to wade through.  I recall that along the way Windows standard 
changed from 0 being a null pointer to -1.  I had to change some of my 
code in stringlist to work.  I think my solution was to just multiply by 
2 and then store it.  Found my note - it happened in 2003.  My 
conclusion now, is that its a combination of windows version/updates and 
version of Delphi that causes this issue.

Rohit

sinu sudhakaran wrote:
> Hi all,
>
> I came across a strange bug(???) in latest versions of Delphi.
>
> Have a look at the following code.
>
> procedure TForm1.Button1Click(Sender: TObject);
> var
> i : integer;
> begin
> ComboBox1.Clear;
> ComboBox1.Items.AddObject('All Locations', TObject(-1));
> ComboBox1.Items.AddObject('Only this Location', TObject(0));
> ComboBox1.Items.AddObject(Test Location', TObject(1));
>
> i := Integer(ComboBox1.Items.Objects[0]);
> showmessage(inttostr(i));
> end;
>
> When I tried to run this code in Delphi 6 and Delphi 2007 , I am 
> getting List Index out of bounds[0] error in Showmessage. When I tried 
> -2, -3, -4… instead of -1 object , I got the proper output without any
> List index out of bounds error. Also I am getting -1 without any error 
> when I tried this code in Delphi 3.
>
> Is it a bug in latest version of Delphi ? Any help is appreciated.
>
> Thank you
>
> Regards,
> Sinu
>
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