IndexOfName (Delphi)

Description

The following example updates the strings in a list box, given the strings contained in another list box. If a string in the source list box has the form Name=Value and the destination list box contains a string with the same Name part, the Value part in the destination list box is replaced by the source's value. TListBox objects that are not name-value pairs are not assigned a Name, therefore IndexOfName returns -1.

Code

procedure MergeStrings(Dest, Source: TStrings);
var
  I, DI: Integer;
  begin
  for I := 0 to Source.Count - 1 do
  begin
    if Pos ('=', Source[I]) > 1 then
    begin
      DI := Dest.IndexOfName(Source.Names[I]);
      if DI > -1 then Dest[DI] := Source[I];
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  MergeStrings(ListBox1.Items, ListBox2.Items);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  ListBox1.Items.Add('Plants = 10');
  ListBox1.Items.Add('Animals = 20');
  ListBox1.Items.Add('Minerals = 15');
  ListBox2.Items.Add('Animals = 4');
  ListBox2.Items.Add('Plants = 3');
  ListBox2.Items.Add('Minerals = 78');
end;

Uses

• System.Classes.TStrings.IndexOfName ( fr | de | ja )
• System.Classes.TStrings.Count ( fr | de | ja )
• System.Classes.TStrings.Names ( fr | de | ja )
• System.Classes.TStrings.Strings ( fr | de | ja )
• System.Pos ( fr | de | ja )