本文共 2604 字，大约阅读时间需要 8 分钟。

逻辑：

1.使用QProcess在开线程前设置输出文件【setStandardOutputFile】;

2.开一个线程，去专门调用shell命令，比如ping；

3.Qt读取重定向文件，进行界面显示；

程序运行截图如下：

源码如下：

widget.h

QT_BEGIN_NAMESPACEclass QProcess;class QTimer;QT_END_NAMESPACEnamespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECTpublic:    explicit Widget(QWidget *parent = 0);    ~Widget();    void removeExistFile(const QString fileName);    void getTopInformation(const QString cmd, const QString fileName);protected slots:    void readTopInfo();    void pingBtnClicked();private:    Ui::Widget *ui;    QProcess *m_process;    QTimer *m_readTime;    QString m_outputFileName;};#endif // WIDGET_H

main.cpp

clude 
   
    int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    w.show();    return a.exec();}
   

widget.cpp

#include "widget.h"#include "ui_widget.h"#include 
   
    #include 
    
     #include 
     
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        Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    m_outputFileName = "ping.txt";    removeExistFile(m_outputFileName);    this->setWindowTitle("CSDN IT1995");    m_process = new QProcess;    connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(pingBtnClicked()));}Widget::~Widget(){    delete ui;}void Widget::removeExistFile(const QString fileName){    if(QFile::exists(fileName)){        if(QFile::remove(fileName)){            qDebug() << fileName + " is discovered! remove successful";        }        else{            qDebug() << fileName + " remove failed";        }        return;    }    qDebug() << fileName + "is undiscovered!";}void Widget::getTopInformation(const QString cmd, const QString fileName){   m_process->setStandardOutputFile(fileName);   m_process->start(cmd);   QEventLoop loop;   m_readTime = new QTimer;   connect(m_readTime, SIGNAL(timeout()), this, SLOT(readTopInfo()));   connect(m_process, SIGNAL(finished(int,QProcess::ExitStatus)), &loop, SLOT(quit()));   m_readTime->start(500);   loop.exec();}void Widget::readTopInfo(){    QFile file("ping.txt");    if(!file.open(QIODevice::ReadOnly | QIODevice::Text)){        qDebug() << "open failed!";        return;    }    QTextStream in(&file);    QString pingFileInfo = in.readAll();    QStringList lineList = pingFileInfo.split("\n");    ui->listWidget->clear();    for(int i = 0; i < lineList.size(); i++){        ui->listWidget->insertItem(i, lineList[i]);    }}void Widget::pingBtnClicked(){    QString ipOrUrl = ui->lineEdit->text();    QString cmd = "ping " + ipOrUrl;    ui->pushButton->setEnabled(false);    getTopInformation(cmd, "ping.txt");}
       
      
     
    
   

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