Linux下Qt实现任务管理器

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QListWidget> #include <QListWidgetItem> #include <QStringList> 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() ) );//ui控件-事件响应 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(); 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) 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; 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"); //这个文件包含了CPU活动的信息 if ( !tempFile.open(QIODevice::ReadOnly) ) { QMessageBox::warning(this, tr("warning"), tr("The stat file can not open!"), QMessageBox::Yes); return; } tempStr = tempFile.readLine(); 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); while (1) { 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; } 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(); proState = te