Title: add records to TStrings (TTreeview / TListview)?
{
Bei der Klasse TStrings und den Komponenten TTreeview/TListview gibt es die
Möglichkeit, neben dem einfachen einfügen eines Strings auch Objekte mitanzufügen.
Da eine Klasse TObject erwartet wird, muss man einen kleinen Umweg programmieren.
}
{
The Classes TStrings and the components TTreeview/TListview allow you to add an
additional Object to a string.
Since a TObject is expected, you need to make a little detour to achive this.
}
type
TMyRecord = record
id: Integer;
Name: string;
{...}
end;
PMyRecord = ^TMyRecord;
{...}
{ In this example I use a Listview component }
procedure Form1.Form1Create(Sender: TObject)
var
i: Integer;
pRec: PMyRecord;
begin
for i := 0 to 10 do
begin
new(pRec);
pRec.id := i;
pRec.Name := 'Entry' + IntToStr(i);
{...}
ListView1.AddItem('Entry' + IntToStr(i), Pointer(pRec));
end;
end;
{ To retrieve the stored records just use this: }
procedure Form1.ListView1Click(Sender: TObject);
var
i: Integer;
xRec: TMyRec;
begin
for i := 0 to Listview1.Count - 1 do
if ListView1.Selected[i] then
begin
xRec := PMyRecord(ListView1.Items.Objects[i])^;
ShowMessage(Format('Record #%d Name: %s', [xRec.id, xRec.Name]));
end;
end;
{ finally do not forget to free assigned memory }
procedure Form1.FormClose(Sender: TObject);
var
i: Integer;
begin
for i := 0 to ListView1.Count - 1 do
if ListView1.Items.Objects[i] nil then
Dispose(ListView1.Items.Objects[i]);
end;