From kde-bindings  Wed Jun 24 21:43:00 2009
From: angel ignacio colmenares laguado <angel.ignacio.colmenares () gmail ! com>
Date: Wed, 24 Jun 2009 21:43:00 +0000
To: kde-bindings
Subject: [Kde-bindings] Qyoto: System.Data.DataTable as model for QTableVie
Message-Id: <3f37f8c90906241443j5a383973v80bd6d8b1fc9794a () mail ! gmail ! com>
X-MARC-Message: https://marc.info/?l=kde-bindings&m=124587984005541
MIME-Version: 1
Content-Type: multipart/mixed; boundary="--===============0836322338=="

--===============0836322338==
Content-Type: multipart/alternative; boundary=0016364d2121bdaf9c046d1efde2

--0016364d2121bdaf9c046d1efde2
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

i am implementing a custom model using a System.Data.DataTable, but get
this error:

Fatal error: C# instance has been wrongly GC'd for virtual
0xa3fa3f8->QAbstractItemModel::rowCount(const QModelIndex&) const call.

this is the code:

using System;
using Qyoto;
namespace qtnet
{

    public class TableModelSample
    {

        private QTableView view;
        private TableModel model;
        public TableModelSample()
        {
            System.Data.DataTable table = new System.Data.DataTable();
            table.Columns.Add("Name");
            table.Columns.Add("Age");

            for(int i=0 ; i<1000; i++){
               System.Data.DataRowView drv = table.DefaultView.AddNew();
               drv.BeginEdit();
               drv["Name"]=String.Format("name for {0} is = ", i );
               drv["Age"] =String.Format("age for {0} is = ", i );
               drv.EndEdit();
            }

            model= new TableModel(table.DefaultView);
            view = new QTableView();
            view.SetModel(model);
            view.WindowTitle = "Simple Table Model";
            view.Show();
        }

        public static int Main(string[] args){
              new QApplication(args);
              new TableModelSample();
              return QApplication.Exec();
        }

    }

    public class TableModel:QAbstractTableModel{
        System.Data.DataView model;

        public TableModel(System.Data.DataView model, QObject parent) :
base(parent){
            this.model=model;
        }

        public TableModel(System.Data.DataView
model):this(model,(QObject)null){

        }


        public override int RowCount (QModelIndex parent)
        {
            return model.Count;
        }

        public override int ColumnCount(QModelIndex parent){
           return this.model.Table.Columns.Count;
        }

        public override QModelIndex Parent(QModelIndex index) {
          return new QModelIndex();
         }

         public override QVariant Data(QModelIndex index, int role) {
        if (!index.IsValid())
            return new QVariant();

        if (role != (int) Qt.ItemDataRole.DisplayRole)
            return new QVariant();

        return new QVariant(model[index.Row()][index.Column()].ToString());

       }

    }
}


what is wrong in my code ?


angel ignacio colmenares laguado

--0016364d2121bdaf9c046d1efde2
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

i am implementing a custom model using a System.Data.DataTable, but get<br>=
this error:<br><br clear=3D"all">Fatal error: C# instance has been wrongly =
GC&#39;d for virtual 0xa3fa3f8-&gt;QAbstractItemModel::rowCount(const QMode=
lIndex&amp;) const call.<br>
<br>this is the code:<br><br>using System;<br>using Qyoto;<br>namespace qtn=
et<br>{<br>=A0=A0=A0 <br>=A0=A0=A0 public class TableModelSample<br>=A0=A0=
=A0 {<br>=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 private QTableView vie=
w;<br>=A0=A0=A0 =A0=A0=A0 private TableModel model;<br>
=A0=A0=A0 =A0=A0=A0 public TableModelSample()<br>=A0=A0=A0 =A0=A0=A0 {<br>=
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 System.Data.DataTable table =3D new System.Da=
ta.DataTable();<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 table.Columns.Add(&quot;Na=
me&quot;);<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 table.Columns.Add(&quot;Age&quo=
t;);<br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 for(int i=
=3D0 ; i&lt;1000; i++){<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0 System.Data=
.DataRowView drv =3D table.DefaultView.AddNew();<br>=A0=A0=A0 =A0=A0=A0 =A0=
=A0=A0 =A0=A0 drv.BeginEdit();<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0 drv[=
&quot;Name&quot;]=3DString.Format(&quot;name for {0} is =3D &quot;, i );<br=
>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0 drv[&quot;Age&quot;] =3DString.Format(=
&quot;age for {0} is =3D &quot;, i );<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=
=A0 drv.EndEdit();<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 }<br>=A0=A0=A0 =A0=A0=
=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 model=3D new TableModel(tab=
le.DefaultView);<br>=A0=A0=A0 =A0=A0=A0 =A0 =A0 view =3D new QTableView();<=
br>
=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 view.SetModel(model);<br>=A0=A0=A0 =A0=A0=A0 =
=A0=A0=A0 view.WindowTitle =3D &quot;Simple Table Model&quot;;<br>=A0=A0=A0=
 =A0=A0=A0 =A0=A0=A0 view.Show();<br>=A0=A0=A0 =A0=A0=A0 }<br><br>=A0=A0=A0=
 =A0=A0=A0 public static int Main(string[] args){<br>=A0=A0=A0=A0=A0 =A0=A0=
=A0 =A0=A0=A0 new QApplication(args);<br>
=A0=A0=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 new TableModelSample();<br>=A0=A0=A0=A0=
=A0 =A0=A0=A0 =A0=A0=A0 return QApplication.Exec();<br>=A0=A0=A0 =A0=A0=A0 =
}<br>=A0=A0=A0 <br>=A0=A0=A0 }<br>=A0=A0=A0 <br>=A0=A0=A0 public class Tabl=
eModel:QAbstractTableModel{<br>=A0=A0=A0 =A0=A0=A0 System.Data.DataView mod=
el;<br>=A0=A0=A0 =A0=A0=A0 <br>
=A0=A0=A0 =A0=A0=A0 public TableModel(System.Data.DataView model, QObject p=
arent) : base(parent){<br>=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0 this.model=3Dmode=
l;<br>=A0=A0=A0 =A0=A0=A0 }<br>=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 =
public TableModel(System.Data.DataView model):this(model,(QObject)null){<br=
>
=A0=A0=A0 =A0=A0=A0=A0=A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 }<br>=A0=A0=A0 =A0=
=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 public override int =
RowCount (QModelIndex parent)<br>=A0=A0=A0 =A0=A0=A0 {=A0=A0=A0 =A0=A0=A0 =
=A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 return model.Count; <br>=A0=A0=
=A0 =A0=A0=A0 }<br>=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 public overr=
ide int ColumnCount(QModelIndex parent){<br>
=A0=A0=A0 =A0=A0=A0=A0=A0=A0 return this.model.Table.Columns.Count;<br>=A0=
=A0=A0 =A0=A0=A0 }<br><br>=A0=A0=A0 =A0=A0=A0 public override QModelIndex P=
arent(QModelIndex index) {<br>=A0=A0=A0 =A0=A0=A0=A0=A0 return new QModelIn=
dex(); <br>=A0=A0=A0=A0 =A0=A0=A0 }<br>=A0=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0=
=A0 =A0=A0=A0 public override QVariant Data(QModelIndex index, int role) {<=
br>
=A0=A0=A0 =A0=A0=A0 if (!index.IsValid())<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =
return new QVariant();<br>=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=A0 =A0=A0=A0 if (r=
ole !=3D (int) Qt.ItemDataRole.DisplayRole)<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=
=A0 return new QVariant();<br>=A0=A0=A0 =A0=A0=A0 =A0=A0=A0 =A0=A0=A0 <br>=
=A0=A0=A0 =A0=A0=A0 return new QVariant(model[index.Row()][index.Column()].=
ToString());<br>
=A0=A0=A0 =A0=A0 <br>=A0=A0=A0 =A0=A0 }<br>=A0=A0=A0 =A0=A0=A0 <br>=A0=A0=
=A0 }<br>}<br><br><br>what is wrong in my code ?<br><br><br>angel ignacio c=
olmenares laguado<br>

--0016364d2121bdaf9c046d1efde2--

--===============0836322338==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Kde-bindings mailing list
Kde-bindings@kde.org
https://mail.kde.org/mailman/listinfo/kde-bindings

--===============0836322338==--