QT在linux环境下读取和设置系统时间（通过system来直接调用Linux命令，注意权限问题）

QT在Linux环境下读取和设置系统时间

本文博客链接:http://blog.csdn.NET/jdh99,作者:jdh,转载请注明.

环境：

主机:Fedora12

开发软件：QT

读取系统时间

void moreidDialog::refresh_time()
{
    QDateTime time;
    txt_time->setText(time.currentDateTime().toString("yyyy") + "." +
                      time.currentDateTime().toString("M") + "." +
                      time.currentDateTime().toString("d") + "." +
                      time.currentDateTime().toString("h") + "." +
                      time.currentDateTime().toString("m"));
}

读取到分，时间间隔用"."，最终读取并显示的效果：2011.12.27.9.14

 

设置系统时间

//保存时间键
void moreidDialog::slot_save_time_key()
{
    QDateTime time;
    QString str = txt_time->text();
    //判断格式是否正确
    if (str.count(".") != 4)
    {
        txt_time->setText(tr("ge shi cuo wu"));
        return;
    }
    int i = 0,j = 0;
    i = str.indexOf(".");
    QString year = str.mid(0,i);
    j = str.indexOf(".",i + 1);
    QString month = str.mid(i + 1,j - i - 1);
    i = j;
    j = str.indexOf(".",i + 1);
    QString day = str.mid(i + 1,j - i - 1);
    i = j;
    j = str.indexOf(".",i + 1);
    QString hour = str.mid(i + 1,j - i - 1);
    i = j;
    j = str.indexOf(".",i + 1);
    QString min = str.mid(i + 1,j - i - 1);
    bool ok = false;
    year.toInt(&ok);
    if (ok == false)
    {
        txt_time->setText(tr("ge shi cuo wu"));
        return;
    }
    month.toInt(&ok);
    if (ok == false)
    {
        txt_time->setText(tr("ge shi cuo wu"));
        return;
    }
    day.toInt(&ok);
    if (ok == false)
    {
        txt_time->setText(tr("ge shi cuo wu"));
        return;
    }
    hour.toInt(&ok);
    if (ok == false)
    {
        txt_time->setText(tr("ge shi cuo wu"));
        return;
    }
    min.toInt(&ok);
    if (ok == false)
    {
        txt_time->setText(tr("ge shi cuo wu"));
        return;
    }
    str = "date -s " + month + "/" + day + "/" + year;
    system(str.toLatin1().data());
    str = "date -s " + hour + ":" + min + ":" + "00";
    system(str.toLatin1().data());
    //强制写入到CMOS
    system("clock -w");
}

 

同步系统时钟与硬件时钟时间命令:

硬件时钟同步到系统时钟:hwclock --hctosys

系统时钟同步到硬件时钟:hwclock -systohc

http://blog.csdn.net/jdh99/article/details/7102196