linux系统和windows系统检测磁盘大小报警

1.应用场景

需要往磁盘中存储图片和或者数据，需要检测磁盘大小，当小于5GB的时候提示用户，并停止存储图片和数据，避免磁盘塞满，无法启动系统或者操作电脑；

2.实现方法

用一个定时器去定时查询磁盘空间大小，linux系统，采用QProess执行命令，然后解析命令返回值，获取剩余的磁盘空间

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void FaceMatch::SlotCheckDriverMemory() {     ///磁盘名     QString strpicPath = CConfig::instance()->GetResaultPath(); #ifdef OS_WINDOWS     QString iDriver = strpicPath.left(3);     LPCWSTR strDriver = (LPCWSTR)iDriver.utf16();     ULARGE_INTEGER freeDiskSpaceAvailable, totalDiskSpace, totalFreeDiskSpace;     ///调用函数获取磁盘参数(单位为字节Byte)     GetDiskFreeSpaceEx(strDriver, &freeDiskSpaceAvailable, &totalDiskSpace, &totalFreeDiskSpace);     quint64 freeDB = totalFreeDiskSpace.QuadPart / (1024 * 1024 * 1024);     m_VideoAnalysisTaskList->SlotSetStoreSpace(freeDB>=5);     if (freeDB < 5)//space less than 5GB     {         if (m_bigThanFiveGB == true)         {             m_bigThanFiveGB = false;             SlotError(-1, strpicPath + "磁盘空间不足5G，请在SystemConfig.xml配置文件切换磁盘，或者清除数据。");         }         else         {             m_bigThanFiveGB = false;         }       }     else//space big than 5GB     {         if (m_bigThanFiveGB == false)//space         {             m_bigThanFiveGB = true;             m_VideoAnalysisTaskList->StartNextWaitTask("struct");             m_VideoAnalysisTaskList->StartNextWaitTask("gait");             SlotError(0, strpicPath + QString("磁盘空间剩余%1,继续分析").arg(freeDB));         }     }       #else     //获取保存的路径的     QProcess process;     process.start("df -h " + strpicPath);     if (process.waitForFinished())     {         QString bytes = process.readAll();         QString strLeftSize=bytes.split("\n").at(1);         QStringList list=strLeftSize.split(" ");         for(int i=0;i<list.size();)         {             if(list[i]==" "||list[i]=="")             {                 list.removeAt(i);             }             else             {                 i++;             }         }         if(list.size()<4)         {              LOG_ERROR("Get store info error:%s ",bytes.toStdString().c_str());              return;         }        strLeftSize=list[3];        strLeftSize= strLeftSize.remove("G");        int freeDB =strLeftSize.toInt();         m_VideoAnalysisTaskList->SlotSetStoreSpace(freeDB >=5);        if(freeDB<5)//space less than 5GB        {            if(m_bigThanFiveGB==true)            {                m_bigThanFiveGB=false;               SlotError (-1, CConfig::instance()->GetResaultPath()+ "磁盘空间不足5G，请在SystemConfig.xml配置文件切换磁盘，或者清除数据。");            }            else            {                 m_bigThanFiveGB=false;            }          }        else//space big than 5GB        {            if(m_bigThanFiveGB==false)//space            {                m_bigThanFiveGB=true;                m_VideoAnalysisTaskList->StartNextWaitTask("struct");                m_VideoAnalysisTaskList->StartNextWaitTask("gait");                 SlotError (0, CConfig::instance()->GetResaultPath() + QString("磁盘空间剩余%1,继续分析").arg(freeDB));            }        }     } #endif         }