第一種方式的鏈接如下：

https://mp.csdn.net/postedit/84067805

第一種方式是重定向到文件，然后讀取，

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第二種方式不重定向到文件，直接讀取！

利用QProcess的特點

運行截圖如下：

源碼如下：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE class QProcess; QT_END_NAMESPACEnamespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();protected:void callTopShell();void initListWidget();protected slots:void readProcess();void processFinished();private:Ui::Widget *ui;QProcess *m_topProcess; };#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h"#include <QProcess> #include <QEventLoop> #include <QTimer> #include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);m_topProcess = new QProcess;callTopShell();connect(m_topProcess, SIGNAL(readyRead()), this, SLOT(readProcess()));connect(m_topProcess, SIGNAL(finished(int,QProcess::ExitStatus)),this, SLOT(processFinished()));initListWidget(); }Widget::~Widget() {delete ui; }void Widget::callTopShell() {QString cmdTop = "top -b -n 1";m_topProcess->start(cmdTop); }void Widget::processFinished(){qDebug()<< "process Finished";QEventLoop loop;QTimer::singleShot(0.2 * 1000, &loop, SLOT(quit()));loop.exec();initListWidget();callTopShell(); }void Widget::initListWidget() {ui->textEdit->clear(); }void Widget::readProcess() {qDebug()<< "readProcess called!";//qDebug()<< m_topProcess->readAll();ui->textEdit->insertPlainText(m_topProcess->readAll()); }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

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總結

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