Qt+树莓派4B 磁盘、内存、mac地址等系统信息获取

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前言

因为树莓派4B使用sd卡作为存储介质,而sd卡存储空间有限,所以在使用树莓派开发时,经常遇见磁盘剩余空间判断等需求.本篇介绍qt获取树莓派4B磁盘、内存等系统信息的方法.

一、获取序列号

QString getSerialNumber()
{
    QProcess process;
    QString  strResult;

    process.start("sh", QStringList() << "-c" << "cat /proc/cpuinfo | grep Serial");
    process.waitForFinished(2000);
    strResult = process.readAllStandardOutput();

    QStringList list  = strResult.split(":");

    if(2 == list.size())
    {
        QString strSerial = list.at(1);
        return strSerial.remove(' ').remove('\r').remove('\n');
    }

    return strResult;
}
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二、获取内存

QString getMemInfo()
{
    QProcess process;
    QString  strResult;

    process.start("sh", QStringList() << "-c" << "cat /proc/meminfo");
    process.waitForFinished(2000);
    strResult = process.readAllStandardOutput();

    QStringList list = strResult.split('\n');

    QString strTotal;
    QString strAvalibable;

    foreach(auto i, list)
    {
        if(i.contains("MemTotal:"))
        {
            strTotal = i.remove("MemTotal:").remove(' ').remove("kB").remove('\r').remove('\n');
        }
        else if(i.contains("MemAvailable:"))
        {
            strAvalibable = i.remove("MemAvailable:").remove(' ').remove("kB").remove('\r').remove('\n');
        }

        if(!strTotal.isEmpty() && !strAvalibable.isEmpty())
        {
            break;
        }
    }

    QString strMemInfo = QString("总：%1GB / 余：%2GB").arg(QString::number(strTotal.toFloat()/1000000,'f', 2)).
            arg(QString::number(strAvalibable.toFloat()/1000000, 'f', 2));

    return strMemInfo;
}
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三、获取mac地址

QString getMac()
{
    QProcess process;
    QString  strResult;

    process.start("sh", QStringList() << "-c" << "cat /sys/class/net/eth0/address");
    process.waitForFinished(2000);
    strResult = process.readAllStandardOutput();

    return strResult.remove('\r').remove('\n');
}
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四、获取磁盘容量

QString getSystem()
{
	QProcess process;
    process.start("df",QStringList()<<"-B"<<"1");
    process.waitForFinished();
    QByteArray output = process.readAllStandardOutput();
    QString str_output = output;
    str_output=str_output.mid(str_output.indexOf("/dev/sda1"));
    //得到: /dev/sda1        49G   38G  9.3G   81%
    str_output=str_output.section('/',0,2);
    str_output=str_output.section(' ',1);
    //将多个空格换成单个空格
    str_output=str_output.replace(QRegExp("[\\s]+"), " ");

    QString text;
    text="磁盘总容量: "+str_output.section(' ',1,1)+"\n";
    text+="已用: "+str_output.section(' ',2,2)+"\n";
    text+="可用: "+str_output.section(' ',3,3);
    return text;
}
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