Qt Timer is a Qt class that allows developers to create and manipulate timers in their applications. Timers are used to trigger events at specified intervals of time.
The QTimer class provides a high-level interface for creating timed events. It can be used to trigger a function or method call periodically or after a certain amount of time has elapsed.
To use the QTimer class, you first need to create an instance of it. Then you can specify the timeout period, which determines how often the timer will fire. You can also connect the timer’s timeout signal to a slot or function that will be executed when the timer fires.
Here’s an example of how to use the QTimer class to create a simple timer that will print “Hello World!” every second:
#include <QTimer>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QTimer *timer = new QTimer();
QObject::connect(timer, &QTimer::timeout, [](){
qDebug() << "Hello World!";
});
timer->start(1000); // fire every 1 second
return app.exec();
}
In this example, we create a QTimer instance and connect its timeout signal to a lambda function that prints “Hello World!” using qDebug(). We then start the timer with a timeout value of 1000 milliseconds (1 second).
When the application runs, the timer will fire every second and “Hello World!” will be printed to the console.
