Question

I used QTableWidget in my program, and tried to set the background color of some certain cells, however every time i got nothing except Access violation.

QTableWidget* tTable = new QTableWidget();
tTable->setItem(0, 0, new QTableWidgetItem());
tTable->item(0, 0)->setBackgroundColor(Qt::red);

I’m using MSVC 2010.

Answer 1

Use setRowCount and setColumnCount in order to set the number of rows and columns for your table.

QTableWidget* tTable = new QTableWidget();
tTable->setRowCount(1);
tTable->setColumnCount(1);
tTable->setItem(0, 0, new QTableWidgetItem());
tTable->item(0, 0)->setBackgroundColor(Qt::red);

Alternatively provide the number of rows and columns of the table in the constructor

QTableWidget* tTable = new QTableWidget(1,1,this);