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Listing items in listbox without certain extensions

Posted on 2004-10-19
4
281 Views
Last Modified: 2010-04-05
I have a list of items in a listbox.  I now want to list these same items in a second listbox but without files with extensions of ".gif" and ".jpg". I have tried the following code but it doesn't work.  Why?  I am using Delphi 6.  Many thanks for your help.

i := 0;
repeat
begin

if (ExtractFileExt(ListBox1.Items.Strings[i]) <> '.gif') or (ExtractFileExt(ListBox1.Items.Strings[i]) <> '.jpg) then
ListBox2.Items.Add(ListBox1.Items.Strings[i];

end;
inc(i);
until i = ListBox1.Items.Count;    
0
Comment
Question by:rincewind666
  • 2
4 Comments
 
LVL 17

Assisted Solution

by:Wim ten Brink
Wim ten Brink earned 250 total points
ID: 12350069
(ExtractFileExt(ListBox1.Items.Strings[i]) <> '.gif') or (ExtractFileExt(ListBox1.Items.Strings[i]) <> '.jpg)

This evaluates to true all the time... :-)

(ExtractFileExt(ListBox1.Items.Strings[i]) <> '.gif') AND (ExtractFileExt(ListBox1.Items.Strings[i]) <> '.jpg)

AND
AND
AND
AND
AND

But better:
not (AnsiCompareText(ListBox1.Items.Strings[i], '.gif') or AnsiCompareText(ListBox1.Items.Strings[i], '.jpg'))

Add the if-then yourself, please...
0
 
LVL 17

Expert Comment

by:Wim ten Brink
ID: 12350081
Oh, and in my last code, it must be OR, not AND...
0
 
LVL 7

Accepted Solution

by:
LRHGuy earned 250 total points
ID: 12350140
You may be able to speed the process up a little bit, and make it more reable with something  like:

var
  E:string;

i := 0;
repeat
  begin
    E:=lowercase(ExtractFileExt(ListBox1.Items.Strings[I]);
    if (E<>'.gif') and (E<>'.jpg')    //easy to add more tests here...
    then
      ListBox2.Items.Add(ListBox1.Items.Strings[i];
  end;
  inc(i);
until i = ListBox1.Items.Count;    
0
 

Author Comment

by:rincewind666
ID: 12350648
Many thanks for your help. Greatly appreciated.
0

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