not able to load images to qtablewidget

[ChrisW67]

As janorcutt alluded to, ":/images/*.png" is not the name of an image file so you end up with a null QIcon. You want to load a single image file into each cell. Assuming your files are named img0.png through img8.png, then:

for (int r = 0; r < t.rowCount(); ++r)
{
  for (int c = 0; c < t.columnCount(); ++c)
  {
    QTableWidgetItem* item = new QTableWidgetItem;
    item->setBackgroundColor(Qt::black);
    item->setIcon(
      QIcon(
        QString(":/images/img%1.png").arg(r * t.columnCount() + c)
      )
    );
    t.setItem(r, c, item);
  }
}

for (int r = 0; r < t.rowCount(); ++r)
{
  for (int c = 0; c < t.columnCount(); ++c)
  {
    QTableWidgetItem* item = new QTableWidgetItem;
    item->setBackgroundColor(Qt::black);
    item->setIcon(
      QIcon(
        QString(":/images/img%1.png").arg(r * t.columnCount() + c)
      )
    );
    t.setItem(r, c, item);
  }
}

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should be closer to what you thought you were doing.

BTW: Your initial screen shot shows a 4x3 grid not a 3x3 grid