i.mx287学习笔记5-Time
1.网络时间接口下面介绍几个常用的时间同步服务器的域名及IP地址：域名 IP地址time-a.nist.gov129.6.15.28time-b.nist.gov129.6.15.29time-a.timefreq.bldrdoc.gov 132.163.4.101time-b.timefreq.bldrdoc132.163.4.102time-c.timefreq.bldrdoc.gov132.163.4.103utcnist.colorado.edu128.138.140.44time.nist.gov192.43.244.18time-nw.nist.gov 131.107.1.10nist1.datum.com66.243.43.21nist1-dc.glassey.com 216.200.93.8nist1-ny.glassey.com208.184.49.9nist1-sj.glassey.com207.126.98.204nist1.aol-ca.truetime.com207.200.81.113nist1.aol-va.truetime.com205.188.185.33国家授时210.72.145.44
2.QT电脑端测试
源码
QStringList net_time;
QTcpSocket *socket = new QTcpSocket();
socket->connectToHost("time.nist.gov", 13);
if (socket->waitForConnected())
{
if (socket->waitForReadyRead())
{
QString str(socket->readAll());
str = str.trimmed();
str = str.section(" ", 1, 2);
qDebug() <<"Time:"<< str;
}
}
else
{
qDebug("Connected:err");
}
socket->close();
delete socket;
3.显示系统时间初始化
QTimer *timer = new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(timerUpdate()));
timer->start(1000);显示：
void MainWindow::timerUpdate(void)
{
QDateTime time = QDateTime::currentDateTime();
QString str = time.toString("yyyy-MM-dd hh:mm:ss dddd");
ui->label->setText(str);
}
效果：
4.开启定时器初始化
qsrand(time(0));
startTimer(1000);源码
void MainWindow::timerEvent(QTimerEvent *t)
{
*t =*t;
QString ab = QString::number(count);
ui->label_2->setText(ab);
count++;
}
效果，1秒自加一次
文档来源：51CTO技术博客https://blog.51cto.com/u_15294654/3112500
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