继续上次的操作系统课设,这次需要设计一个简单的任务管理器,大部分人选择GTK来实现,我剑走偏锋,使用Qt来完成这个任务。
用户和应用程序可以通过/proc得到系统的信息,并可以改变内核的某些参数。由于系统的信息是动态改变的,所以用户或应用程序读取proc文件时,proc文件系统是动态从系统内核读出所需信息并提交的。
我们要显示系统信息,只需进行相应的文件操作就行了。
首先需要下载一份Qt的SDK,这是Qt的英文官网:http://qt.nokia.com/,当然也有中文版的:http://qt.nokia.com/title-cn/。
别问我为什么有个nokia,那是因为Qt是诺基亚开发的一个跨平台的C++图形用户界面应用程序框架。
Qt商业版只能试用30天,不过有GPL版的,可以免费使用。官网上还有一个非常不错的免费Qt集成开发环境Qt Creator IDE。我使用的就是这个软件:
打开相应的文件,读取所需要的信息,将其显示在控件上就可以了。
我采用的是Qt来实现图形界面。
工程文件夹:
编译完成后的实现效果:
这个实验总的来讲还是比较简单的,源码如下:
main.cpp
- #include
- #include "mainwindow.h"
- int main(int argc, char *argv[])
- {
- QApplication a(argc, argv); //应用程序类,每个应用程序有且只有一个
- MainWindow w; //实例化MainWindow类
- w.show(); //显示界面
- return a.exec(); //进入应用程序的循环中,直到程序退出
- }
mainwindow.h
- #ifndef MAINWINDOW_H
- #define MAINWINDOW_H
- #include
- namespace Ui {
- class MainWindow;
- }
- class MainWindow : public QMainWindow
- {
- Q_OBJECT
- public:
- explicit MainWindow(QWidget *parent = 0);
- ~MainWindow();
- private:
- Ui::MainWindow *ui; //界面资源类,所有的界面元素都是通过该类来调用
- QTimer *timer; //计时器
- private slots:
- void on_pushButton_pkill_clicked();
- void on_pushButton_prefresh_clicked();
- void on_pushButton_Model_install_clicked();
- void on_pushButton_Model_remove_clicked();
- void on_pushButton_Model_refresh_clicked();
- void on_pushButton_reboot_clicked();
- void on_pushButton_halt_clicked();
- void on_tabWidget_INFO_currentChanged(int index);
- void timer_update_currentTabInfo();
- //显示tab中的内容
- void show_tabWidgetInfo(int index);
- };
- #endif // MAINWINDOW_H
mainwindow.cpp
- #include "mainwindow.h"
- #include "ui_mainwindow.h"
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- int a0 = 0, a1 = 0, b0 = 0, b1 = 0;
- MainWindow::MainWindow(QWidget *parent) : //构造函数,初始化ui,计时器
- QMainWindow(parent),
- ui(new Ui::MainWindow)
- {
- ui->setupUi(this);
- timer = new QTimer(this);
- QWidget::connect( timer, SIGNAL( timeout() ), this, SLOT( timer_update_currentTabInfo() ) );
- QWidget::connect( ui->tabWidget_INFO, SIGNAL( currentChanged() ),
- this, SLOT( on_tabWidget_currentChanged() ) );
- timer->start(1000);
- }
- MainWindow::~MainWindow()
- {
- delete ui;
- delete timer;
- }
- void MainWindow::timer_update_currentTabInfo()
- {
- int index = ui->tabWidget_INFO->currentIndex();
- //定时器只刷新内存tab页面,用于进度条动态显示
- if (index == 0)
- {
- show_tabWidgetInfo(index);
- }
- }
- void MainWindow::show_tabWidgetInfo(int index)
- {
- QString tempStr; //读取文件信息字符串
- QFile tempFile; //用于打开系统文件
- int pos; //读取文件的位置
- if (index == 0) //内存資源
- {
- tempFile.setFileName("/proc/meminfo"); //打开内存信息文件
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The meminfo file can not open!"), QMessageBox::Yes);
- return ;
- }
- QString memTotal;
- QString memFree;
- QString memUsed;
- QString swapTotal;
- QString swapFree;
- QString swapUsed;
- int nMemTotal, nMemFree, nMemUsed, nSwapTotal, nSwapFree, nSwapUsed;
- while (1)
- {
- tempStr = tempFile.readLine();
- pos = tempStr.indexOf("MemTotal");
- if (pos != -1)
- {
- memTotal = tempStr.mid(pos+10, tempStr.length()-13);
- memTotal = memTotal.trimmed();
- nMemTotal = memTotal.toInt()/1024;
- }
- else if (pos = tempStr.indexOf("MemFree"), pos != -1)
- {
- memFree = tempStr.mid(pos+9, tempStr.length()-12);
- memFree = memFree.trimmed();
- nMemFree = memFree.toInt()/1024;
- }
- else if (pos = tempStr.indexOf("SwapTotal"), pos != -1)
- {
- swapTotal = tempStr.mid(pos+11, tempStr.length()-14);
- swapTotal = swapTotal.trimmed();
- nSwapTotal = swapTotal.toInt()/1024;
- }
- else if (pos = tempStr.indexOf("SwapFree"), pos != -1)
- {
- swapFree = tempStr.mid(pos+10,tempStr.length()-13);
- swapFree = swapFree.trimmed();
- nSwapFree = swapFree.toInt()/1024;
- break;
- }
- }
- nMemUsed = nMemTotal - nMemFree;
- nSwapUsed = nSwapTotal - nSwapFree;
- memUsed = QString::number(nMemUsed, 10);
- swapUsed = QString::number(nSwapUsed, 10);
- memFree = QString::number(nMemFree, 10);
- memTotal = QString::number(nMemTotal, 10);
- swapFree = QString::number(nSwapFree, 10);
- swapTotal = QString::number(nSwapTotal, 10);
- ui->label_RAM_Used->setText(memUsed+" MB");
- ui->label_RAM_Left->setText(memFree+" MB");
- ui->label_RAM_Total->setText(memTotal+" MB");
- ui->label_SWAP_Used->setText(swapUsed+" MB");
- ui->label_SWAP_Left->setText(swapFree+" MB");
- ui->label_SWAP_Total->setText(swapTotal+" MB");
- ui->progressBar_RAM->setValue(nMemUsed*100/nMemTotal);
- ui->progressBar_SWAP->setValue(nSwapUsed*100/nSwapTotal);
- tempFile.close(); //关闭内存信息文件
- int tt = 2; //取2个点采样计算cpu当前利用律
- int cpuInfo[2][7];
- int cpuTotal[2][2];
- while (tt)
- {
- tempFile.setFileName("/proc/stat"); //打开CPU使用状态信息
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The stat file can not open!"), QMessageBox::Yes);
- return;
- }
- tempStr = tempFile.readLine();
- for (int i = 0; i < 7; i++)
- {
- cpuInfo[2-tt][i] = tempStr.section(" ", i+1, i+1).toInt();
- cpuTotal[1][2-tt] += cpuInfo[2-tt][i];
- if (i == 3)
- {
- cpuTotal[0][2-tt] += cpuInfo[2-tt][i];
- }
- }
- tt--;
- tempFile.close(); //关闭stat文件
- }
- int a = cpuTotal[0][1] - cpuTotal[0][0];
- int b = cpuTotal[1][1] - cpuTotal[1][0];
- if (a < 0)
- {
- a = -a;
- }
- if (b < 0)
- {
- b = -b;
- }
- ui->progressBar_CPU->setValue(a*100/b);
- tempFile.setFileName("/proc/stat");
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The stat file can not open!"), QMessageBox::Yes);
- return;
- }
- tempStr = tempFile.readLine();
- a0 = a1;
- b0 = b1;
- a1 = b1 = 0;
- int gg;
- for (int i = 0; i < 7; i++)
- {
- b1 += tempStr.section(" ", i+2, i+2).toInt();
- gg = b1;
- if (i == 3)
- {
- a1 += tempStr.section(" ", i+2, i+2).toInt();
- }
- }
- int m, n;
- m = a1 - a0;
- n = b1 - b0;
- if (m < 0)
- {
- m = -m;
- }
- if (n < 0)
- {
- n = -n;
- }
- ui->progressBar_CPU->setValue( (n-m)*100/n );
- tempFile.close(); //关闭stat文件
- }
- else if (index == 1) //进程信息
- {
- ui->listWidget_process->clear();
- QDir qd("/proc");
- QStringList qsList = qd.entryList();
- QString qs = qsList.join("\n");
- QString id_of_pro;
- bool ok;
- int find_start = 3;
- int a, b;
- int nProPid; //进程PID
- int number_of_sleep = 0, number_of_run = 0, number_of_zombie = 0;
- int totalProNum = 0; //进程总数
- QString proName; //进程名
- QString proState; //进程状态
- QString proPri; //进程优先级
- QString proMem; //进程占用内存
- QListWidgetItem *title = new QListWidgetItem("PID\t" + QString::fromUtf8("名称") + "\t\t" +
- QString::fromUtf8("状态") + "\t" +
- QString::fromUtf8("优先级") + "\t" +
- QString::fromUtf8("占用内存"), ui->listWidget_process);
- //循环读取进程
- while (1)
- {
- //获取进程PID
- a = qs.indexOf("\n", find_start);
- b = qs.indexOf("\n", a+1);
- find_start = b;
- id_of_pro = qs.mid(a+1, b-a-1);
- totalProNum++;
- nProPid = id_of_pro.toInt(&ok, 10);
- if(!ok)
- {
- break;
- }
- //打开PID所对应的进程状态文件
- tempFile.setFileName("/proc/" + id_of_pro + "/stat");
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The pid stat file can not open!"), QMessageBox::Yes);
- return;
- }
- tempStr = tempFile.readLine();
- if (tempStr.length() == 0)
- {
- break;
- }
- a = tempStr.indexOf("(");
- b = tempStr.indexOf(")");
- proName = tempStr.mid(a+1, b-a-1);
- proName.trimmed(); //删除两端的空格
- proState = tempStr.section(" ", 2, 2);
- proPri = tempStr.section(" ", 17, 17);
- proMem = tempStr.section(" ", 22, 22);
- switch ( proState.at(0).toLatin1() )
- {
- case 'S': number_of_sleep++; break; //Sleep
- case 'R': number_of_run++; break; //Running
- case 'Z': number_of_zombie++; break; //Zombie
- default : break;
- }
- if (proName.length() >= 12)
- {
- QListWidgetItem *item = new QListWidgetItem(id_of_pro + "\t" +
- proName + "\t" +
- proState + "\t" +
- proPri + "\t" +
- proMem, ui->listWidget_process);
- }
- else
- {
- QListWidgetItem *item = new QListWidgetItem(id_of_pro + "\t" +
- proName + "\t\t" +
- proState + "\t" +
- proPri + "\t" +
- proMem, ui->listWidget_process);
- }
- }
- QString temp;
- temp = QString::number(totalProNum, 10);
- ui->label_pNum->setText(temp);
- temp = QString::number(number_of_run, 10);
- ui->label_pRun->setText(temp);
- temp = QString::number(number_of_sleep, 10);
- ui->label_pSleep->setText(temp);
- temp = QString::number(number_of_zombie, 10);
- ui->label_pZombie->setText(temp);
- tempFile.close(); //关闭该PID进程的状态文件
- }
- else if (index == 2) //模块信息
- {
- ui->listWidget_model->clear();
- tempFile.setFileName("/proc/modules"); //打开模块信息文件
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The modules file can not open!"), QMessageBox::Yes);
- return ;
- }
- //设置模块首行项目
- QListWidgetItem *title = new QListWidgetItem( QString::fromUtf8("名称") + "\t\t\t" +
- QString::fromUtf8("使用内存数") + "\t\t" +
- QString::fromUtf8("使用次數"), ui->listWidget_model);
- QString mod_Name, mod_Mem, mod_Num;
- //循环读取文件内容,查找需要的信息
- while (1)
- {
- tempStr = tempFile.readLine();
- if (tempStr.length() == 0)
- {
- break;
- }
- mod_Name = tempStr.section(" ", 0, 0);
- mod_Mem = tempStr.section(" ", 1, 1);
- mod_Num = tempStr.section(" ", 2, 2);
- if (mod_Name.length() > 10)
- {
- QListWidgetItem *item = new QListWidgetItem(mod_Name + "\t\t" +
- mod_Mem + "\t\t" +
- mod_Num, ui->listWidget_model);
- }
- else
- {
- QListWidgetItem *item = new QListWidgetItem(mod_Name + "\t\t\t" +
- mod_Mem + "\t\t" +
- mod_Num, ui->listWidget_model);
- }
- }
- tempFile.close(); //关闭模块信息文件
- }
- else if (index == 3) //系统信息
- {
- //int ok;
- tempFile.setFileName("/proc/cpuinfo"); //打开CPU信息文件
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The cpuinfo file can not open!"), QMessageBox::Yes);
- return;
- }
- //循环读取文件内容,查找需要的信息
- while (1)
- {
- tempStr = tempFile.readLine();
- pos = tempStr.indexOf("model name");
- if (pos != -1)
- {
- pos += 13; //跳过前面的"model name:"所占用的字符
- QString *cpu_name = new QString( tempStr.mid(pos, tempStr.length()-13) );
- ui->label_CPUName->setText(*cpu_name);
- }
- else if (pos = tempStr.indexOf("vendor_id"), pos != -1)
- {
- pos += 12; //跳过前面的"vendor_id:"所占用的字符
- QString *cpu_type = new QString( tempStr.mid(pos, tempStr.length()-12) );
- ui->label_CPUType->setText(*cpu_type);
- }
- else if (pos = tempStr.indexOf("cpu MHz"), pos != -1)
- {
- pos += 11; //跳过前面的"cpu MHz:"所占用的字符
- QString *cpu_frq = new QString( tempStr.mid(pos, tempStr.length()-11) );
- double cpufrq = cpu_frq->toDouble(); //4核CPU
- cpu_frq->setNum(cpufrq*4);
- ui->label_CPUFrequency->setText(*cpu_frq + " HZ");
- }
- else if (pos = tempStr.indexOf("cache size"), pos!=-1)
- {
- pos += 13; //跳过前面的"cache size:"所占用的字符
- QString *cache_size = new QString( tempStr.mid(pos, tempStr.length()-16) );
- int cachesize = cache_size->toInt(); //4核CPU
- cache_size->setNum(cachesize*4);
- ui->label_CatheCapacity->setText(*cache_size + " KB");
- }
- else //跳过其他的内容
- {
- }
- }
- tempFile.close(); //关闭CPU信息文件
- //打开操作系统信息文件
- tempFile.setFileName("/proc/version");
- if ( !tempFile.open(QIODevice::ReadOnly) )
- {
- QMessageBox::warning(this, tr("warning"), tr("The version file can not open!"), QMessageBox::Yes);
- return ;
- }
- tempStr = tempFile.readLine();
- pos = tempStr.indexOf("version");
- QString *os_version = new QString( tempStr.mid(0, pos-1) );
- ui->label_SystemType->setText(*os_version);
- int pos1 = tempStr.indexOf("(");
- QString *os_type = new QString( tempStr.mid(pos, pos1-pos-1) );
- ui->label_SystemVersion->setText(*os_type);
- pos = tempStr.indexOf("gcc version");
- pos1 = tempStr.indexOf("#");
- QString *gcc_info = new QString( tempStr.mid(pos+12, pos1-pos-14) );
- ui->label_GCCVersion->setText(*gcc_info);
- tempFile.close(); //关闭操作系统信息文件
- }
- else //说明
- {
- }
- return;
- }
- void MainWindow::on_pushButton_halt_clicked()
- {
- system("halt");
- }
- void MainWindow::on_pushButton_reboot_clicked()
- {
- system("reboot");
- }
- void MainWindow::on_tabWidget_INFO_currentChanged(int index)
- {
- show_tabWidgetInfo(index); //显示tab中的内容
- return ;
- }
- void MainWindow::on_pushButton_pkill_clicked()
- {
- //获得进程号
- QListWidgetItem *item = ui->listWidget_process->currentItem();
- QString pro = item->text();
- pro = pro.section("\t", 0, 0);
- system("kill " + pro.toLatin1());
- QMessageBox::warning(this, tr("kill"), QString::fromUtf8("该进程已被杀死!"), QMessageBox::Yes);
- //回到进程信息tab表
- show_tabWidgetInfo(1);
- }
- void MainWindow::on_pushButton_prefresh_clicked()
- {
- show_tabWidgetInfo(1);
- }
- void MainWindow::on_pushButton_Model_install_clicked()
- {
- show_tabWidgetInfo(2); //安装模块还不知道如何实现
- }
- void MainWindow::on_pushButton_Model_remove_clicked()
- {
- show_tabWidgetInfo(2); //卸载模块还不知道如何实现
- }
- void MainWindow::on_pushButton_Model_refresh_clicked()
- {
- show_tabWidgetInfo(2);
- }