Treeview and Selected Item


How can i access the selected Object index or ChildObject index in a treeview?  It seems differents then the ListBox

  Desactiver1.Enabled := (TAppareils(Treeview1.Selected).Active = 'true');  

This work (Treeview1.Selected), but not when i access one of is childs... i receive an acess violation.


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Hi Fled...

What is "TAppareils" ???

The code

  Caption := TreeView1.Selected.Text;

works fine! May be the cast of class TTreeNode to TAppareils raise the error...

The class of childs and "parents" are the same (TTreeNode) in the TreeView.Items... The difference are that the root members has Parent = nil, and childs not.

Post the complete code to help me help you...

FledAuthor Commented:
TAppareils is a user class..  This is the code to fill the treeview...

  UnAppareil : TAppareils;
  Node : TTreeNode;
  ChildNode : TTreeNode;
  PlageHaut, PlageBas : string;

    if not CDSAppareils.Active then
        CDSAppareils.Active := true;


    While not CDSAppareils.Eof do
      UnAppareil := TAppareils.Create;
      Node := TTreeNode.Create(nil);

      UnAppareil.NomLogique     := CDSAppareils.FieldValues['chr_NomLogique'];
      UnAppareil.Manufacturier  := CDSAppareils.FieldValues['chr_Manufacturier'];
      UnAppareil.Identificateur := CDSAppareils.FieldValues['chr_Identificateur'];
      UnAppareil.NoSerie        := CDSAppareils.FieldValues['chr_NoSerie'];
      UnAppareil.NoModele       := CDSAppareils.FieldValues['Chr_NoModele'];
      UnAppareil.Active         := CDSAppareils.FieldValues['chr_Actif'];
      UnAppareil.PlageUtilBas   := CDSAppareils.FieldValues['flo_PlageBas'];
      UnAppareil.PlageUtilHaut  := CDSAppareils.FieldValues['flo_PlageHaut'];
      UnAppareil.Resolution     := CDSAppareils.FieldValues['chr_Resolution'];
      UnAppareil.Exactitude     := CDSAppareils.FieldValues['chr_Exactitude'];

      PlageHaut                 := format('%.1f °C', [UnAppareil.PlageUtilHaut]);
      PlageBas                  := format('%.1f °C', [UnAppareil.PlageUtilBas]);

      Form1.TreeView1.Images    := form1.ImageList1;

      Node := Form1.TreeView1.Items.AddObject(nil, UnAppareil.NomLogique, UnAppareil);

      ChildNode := Form1.Treeview1.Items.AddChildObject(Node, UnAppareil.Identificateur + ' - ' +
                    Trim(UnAppareil.Manufacturier) + ' - ' + 'Serie: ' + UnAppareil.NoSerie
                    + ' - ' + 'Model: ' + UnAppareil.NoModele + ' - ' + 'Exact: ' +
                    UnAppareil.Exactitude + ' - ' + 'Resol: ' + UnAppareil.Resolution + ' - '
                    + 'Plages: ( ' + PlageBas + ' - ' + PlageHaut + ' ) ', UnAppareil);

      if UnAppareil.Active = 'true' then
          node.ImageIndex     := 2;
          node.SelectedIndex  := 2;
          ChildNode.ImageIndex := 2;
          ChildNode.SelectedIndex := 2;

          node.ImageIndex     := 3;
          node.SelectedIndex  := 3;
          ChildNode.ImageIndex := 3;
          ChildNode.SelectedIndex := 3;



this would be the correct access:

Desactiver1.Enabled := (TAppareils(Treeview1.Selected.Data).Active = 'true');  

meikl ;-)

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