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没有任何人敢保证自己写的程序没有任何BUG,尤其是在商业项目中,程序量越大,复杂度越高, 出错的概率越大,尤其是现场环境千差万别,和当初本地电脑测试环境很可能不一样,有很多特殊情况没有考虑到,如果需要保证程序7*24小时运行,则需要想一些办法能够让程序死了能够活过来,在嵌入式linux上,大部分会采用看门狗的形式来处理,程序打开看门狗驱动后,定时喂狗,一旦超过规定的时间,则硬件软复位等。这种方式相对来说比较可靠,如果需要在普通PC机上运行怎办呢?本篇文章提供一个软件实现守护进程的办法,原理就是udp通信,单独写个守护进程程序,专门负责检测主程序是否存在,不存在则启动。主程序只需要启动live类监听端口,收到hello就回复ok就行。 为了使得兼容任意程序,特意提炼出来共性,增加了多种设置。 1:可设置检测的程序名称。 2:可设置udp通信端口。 3:可设置超时次数。 4:自动记录已重启次数。 5:自动记录最后一次重启时间。 6:是否需要重新刷新桌面。 7:可重置当前重启次数和最后重启时间。 8:自动隐藏的托盘运行或者后台运行。 9:提供 界面设置程序名称已经开启和暂停服务。 代码 下载: live.zip (64 K) 下载次数:668 window.open('http://www.qtcn.org/bbs/attachment/Mon_1903/44_110085_fffb63ce70b4bcb.png?11');" style="max-width:700px;max-height:700px;" onload="if(is_ie6&&this.offsetWidth>700)this.width=700;" >  守护进程核心代码: - #pragma execution_character_set("utf-8")
- #include "frmmain.h"
- #include "ui_frmmain.h"
- #include "qtimer.h"
- #include "qudpsocket.h"
- #include "qsharedmemory.h"
- #include "qprocess.h"
- #include "qdatetime.h"
- #include "qapplication.h"
- #include "qdesktopservices.h"
- #include "qmessagebox.h"
- #if (QT_VERSION > QT_VERSION_CHECK(5,0,0))
- #include "qstandardpaths.h"
- #endif
- #include "app.h"
- frmMain::frmMain(QWidget *parent) : QWidget(parent), ui(new Ui::frmMain)
- {
- ui->setupUi(this);
- this->initForm();
- }
- frmMain::~frmMain()
- {
- delete ui;
- }
- void frmMain::changeEvent(QEvent *event)
- {
- //隐藏当前界面,最小化到托盘
- if(event->type() == QEvent::WindowStateChange) {
- if(windowState() & Qt::WindowMinimized) {
- hide();
- }
- }
- QWidget::changeEvent(event);
- }
- void frmMain::initForm()
- {
- count = 0;
- ok = false;
- //每秒钟定时询问心跳
- timerHeart = new QTimer(this);
- timerHeart->setInterval(2000);
- connect(timerHeart, SIGNAL(timeout()), this, SLOT(sendHearData()));
- //从6050端口开始,如果绑定失败则将端口加1,直到绑定成功
- udp = new QUdpSocket(this);
- int port = 6050;
- while(!udp->bind(port)) {
- port++;
- }
- connect(udp, SIGNAL(readyRead()), this, SLOT(readData()));
- if (App::TargetAppName.isEmpty()) {
- ui->btnStart->setText("启动");
- ui->btnStart->setEnabled(false);
- timerHeart->stop();
- } else {
- ui->btnStart->setText("暂停");
- ui->btnStart->setEnabled(true);
- timerHeart->start();
- }
- ui->txtAppName->setText(App::TargetAppName);
- ui->txtAppName->setFocus();
- }
- void frmMain::sendHearData()
- {
- udp->writeDatagram("hello", QHostAddress::LocalHost, App::TargetAppPort);
- //判断当前是否没有回复
- if (!ok) {
- count++;
- } else {
- count = 0;
- ok = false;
- }
- //如果超过规定次数没有收到心跳回复,则超时重启
- if (count >= App::TimeoutCount) {
- timerHeart->stop();
- QSharedMemory mem(App::TargetAppName);
- if (!mem.create(1)) {
- killApp();
- }
- QTimer::singleShot(1000 , this, SLOT(killOther()));
- QTimer::singleShot(3000 , this, SLOT(startApp()));
- QTimer::singleShot(4000 , this, SLOT(startExplorer()));
- }
- }
- void frmMain::killApp()
- {
- QProcess *p = new QProcess;
- p->start(QString("taskkill /im %1.exe /f").arg(App::TargetAppName));
- }
- void frmMain::killOther()
- {
- QProcess *p = new QProcess;
- p->start(QString("taskkill /im %1.exe /f").arg("WerFault"));
- //重建缓存,彻底清除托盘图标
- if (App::ReStartExplorer) {
- QProcess *p1 = new QProcess;
- p1->start("taskkill /f /im explorer.exe");
- }
- }
- void frmMain::startApp()
- {
- if (ui->btnStart->text() == "开始" || ui->btnStart->text() == "启动") {
- count = 0;
- return;
- }
- QProcess *p = new QProcess;
- p->start(QString("\"%1/%2.exe\"").arg(qApp->applicationDirPath()).arg(App::TargetAppName));
- count = 0;
- ok = true;
- timerHeart->start();
- App::ReStartCount++;
- App::ReStartLastTime = QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss");
- App::writeConfig();
- ui->labCount->setText(QString("已重启 %1 次").arg(App::ReStartCount));
- ui->labInfo->setText(QString("最后一次重启在 %1").arg(App::ReStartLastTime));
- }
- void frmMain::startExplorer()
- {
- //取得操作系统目录路径,指定操作系统目录下的explorer程序,采用绝对路径,否则在64位操作系统下无效
- #if (QT_VERSION > QT_VERSION_CHECK(5,0,0))
- QString str = QStandardPaths::writableLocation(QStandardPaths::ApplicationsLocation);
- #else
- QString str = QDesktopServices::storageLocation(QDesktopServices::ApplicationsLocation);
- #endif
- if (App::ReStartExplorer) {
- str = QString("%1\\Windows\\explorer.exe").arg(str.mid(0, 2));
- QProcess *p = new QProcess(this);
- p->start(str);
- }
- }
- void frmMain::readData()
- {
- QByteArray tempData;
- do {
- tempData.resize(udp->pendingDatagramSize());
- udp->readDatagram(tempData.data(), tempData.size());
- QString data = QLatin1String(tempData);
- if (data.right(2) == "OK") {
- count = 0;
- ok = true;
- }
- } while (udp->hasPendingDatagrams());
- }
- void frmMain::on_btnOk_clicked()
- {
- App::TargetAppName = ui->txtAppName->text();
- if (App::TargetAppName == "") {
- QMessageBox::critical(this, "提示", "应用程序名称不能为空!");
- ui->txtAppName->setFocus();
- return;
- }
- App::writeConfig();
- ui->btnStart->setEnabled(true);
- }
- void frmMain::on_btnStart_clicked()
- {
- count = 0;
- if (ui->btnStart->text() == "暂停") {
- timerHeart->stop();
- ui->btnStart->setText("开始");
- } else {
- timerHeart->start();
- ui->btnStart->setText("暂停");
- }
- }
- void frmMain::on_btnReset_clicked()
- {
- App::ReStartCount = 0;
- App::ReStartLastTime = "2019-01-01 12:00:00";
- App::writeConfig();
- ui->txtAppName->setText(App::TargetAppName);
- ui->labCount->setText(QString("已重启 %1 次").arg(App::ReStartCount));
- ui->labInfo->setText(QString("最后一次重启在 %1").arg(App::ReStartLastTime));
- QMessageBox::information(this, "提示", "重置配置文件成功!");
- }
主程序使用核心代码: - #include "applive.h"
- #include "qmutex.h"
- #include "qudpsocket.h"
- #include "qstringlist.h"
- #include "qapplication.h"
- #include "qdatetime.h"
- #include "qdebug.h"
- #define TIMEMS qPrintable(QTime::currentTime().toString("HH:mm:ss zzz"))
- QScopedPointer<AppLive> AppLive::self;
- AppLive *AppLive::Instance()
- {
- if (self.isNull()) {
- QMutex mutex;
- QMutexLocker locker(&mutex);
- if (self.isNull()) {
- self.reset(new AppLive);
- }
- }
- return self.data();
- }
- AppLive::AppLive(QObject *parent) : QObject(parent)
- {
- udpServer = new QUdpSocket(this);
- QString name = qApp->applicationFilePath();
- QStringList list = name.split("/");
- appName = list.at(list.count() - 1).split(".").at(0);
- }
- void AppLive::readData()
- {
- QByteArray tempData;
- do {
- tempData.resize(udpServer->pendingDatagramSize());
- QHostAddress sender;
- quint16 senderPort;
- udpServer->readDatagram(tempData.data(), tempData.size(), &sender, &senderPort);
- QString data = QLatin1String(tempData);
- if (data == "hello") {
- udpServer->writeDatagram(QString("%1OK").arg(appName).toLatin1(), sender, senderPort);
- }
- } while (udpServer->hasPendingDatagrams());
- }
- bool AppLive::start(int port)
- {
- bool ok = udpServer->bind(port);
- if (ok) {
- connect(udpServer, SIGNAL(readyRead()), this, SLOT(readData()));
- qDebug() << TIMEMS << "Start AppLive Ok";
- }
- return ok;
- }
- void AppLive::stop()
- {
- udpServer->abort();
- disconnect(udpServer, SIGNAL(readyRead()), this, SLOT(readData()));
- }
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