How to use QTimer
qt, timer
Solution
It's good practice to give a parent to your `QTimer` to use Qt's memory management system.
`update()` is a QWidget function - is that what you are trying to call or not? http://qt-project.org/doc/qt-4.8/qwidget.html#update.
If number 2 does not apply, make sure that the function you are trying to trigger is declared as a slot in the header.
Finally if none of these are your issue, it would be helpful to know if you are getting any run-time connect errors.
Problem
In Qt I'm trying to set a `QTimer` that calls a function called "update" every second. Here is my .cpp file: ``` #include "mainwindow.h" #include "ui_mainwindow.h" #include <QTimer> #include "QDebug" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); QTimer *timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(update())); timer->start(1000); } MainWindow::~MainWindow() { delete ui; } void MainWindow::update() { qDebug() << "update"; } ``` and the main: ``` #include <QtGui/QApplication> #include "mainwindow.h" int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); } ``` The project is being build, but it doesn't execute update, since the line "update" is not showing anywhere... Does anybody see what I´m doing wrong?