Qt 守护进程创建

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QTimer>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    m_process = new QProcess();
    m_process->setProcessChannelMode(QProcess::MergedChannels);
    QTimer *timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(check()));
    timer->start(2000);
}

MainWindow::~MainWindow()
{
    delete ui;
    if (m_process) {
        m_process->close();
        delete m_process;
    }
}

void MainWindow::check()
{
    m_process->start("cmd", QStringList()<<"/c"<<"tasklist | findstr FeiQ");
    m_process->waitForFinished(3000);
    QString strRet = m_process->readLine();
    if(strRet.isEmpty()){
        m_process->startDetached("e:\\FeiQ.exe");
         m_process->waitForFinished(3000);
    }
    qDebug()<<strRet;
}

很简单，检查进程是否存在，不存在则启动之。