Hi all,
i'm new to QT, I get application crashed when i delete the last item in QListWidget....
following is my code...

Qt Code: 
  1. #include <QtGui>
  2.  
  3. class MainWindow : public QWidget
  4. {
  5.     Q_OBJECT
  6. public:
  7.     explicit MainWindow(QWidget *parent = 0)
  8.         : QWidget(parent)
  9.     {
  10.         _listWidget = new QListWidget(this);
  11.         _listWidget->resize(300,200);
  12.         _textEdit = new QTextEdit(this);
  13.         _textEdit->move(0,240);
  14.  
  15.         for(int i= 0 ; i < 3 ; i++){
  16.             QListWidgetItem *item = new QListWidgetItem(_listWidget);
  17.             item->setData(Qt::DisplayRole, tr("item %1").arg(i));
  18.             item->setData(Qt::DecorationRole, qApp->style()->standardIcon(QStyle::SP_DirIcon));
  19.         }
  20.  
  21.         connect(_listWidget, SIGNAL(currentItemChanged(QListWidgetItem*,QListWidgetItem*)),
  22.                 this, SLOT(listItemChged(QListWidgetItem*,QListWidgetItem*)));
  23.  
  24.         QPushButton *delBtn = new QPushButton(tr("Delete current item"), this);
  25.         delBtn->move(0, 210);
  26.         connect(delBtn, SIGNAL(clicked()), this, SLOT(delCurrItem()));
  27.  
  28.         resize(600,700);
  29.     }
  30.  
  31.  
  32. private slots:
  33.     void listItemChged(QListWidgetItem* currItem, QListWidgetItem*)
  34.     {
  35.         _textEdit->append(currItem->data(Qt::DisplayRole).toString());
  36.     }
  37.  
  38.     void delCurrItem()
  39.     {
  40.         if(_listWidget->count() < 1) return;
  41.         delete  _listWidget->currentItem();
  42.     }
  43.  
  44. private:
  45.     QListWidget *_listWidget;
  46.     QTextEdit *_textEdit;
  47.  
  48. };
  49.  
  50. #include "main.moc"
  51.  
  52. int main(int argc, char *argv[])
  53. {
  54.     QApplication app(argc, argv);
  55.     MainWindow mainWin;
  56.     mainWin.show();
  57.     return app.exec();
  58. }
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Could somebody help me? thanks in advance....
Sorry for my poor English....