QT学习笔记—启动外部程序

Qt中与启动外部程序的类：QProcess ，其父类是QIODevice。

The QProcess class is used to start external programs and to communicate with them
QProcess类用于启动外部应用程序以及和它们通信。

启动外部应用程序方法：

void QProcess::start(const QString &program, const QStringList &arguments, OpenMode mode = ReadWrite)
//program 启动的应用程序
//arguments 给启动的应用程序的参数

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实现一个类似windows的运行窗口的应用程序

设计界面：

编写代码：

#include "widget.h"
#include "ui_widget.h"
#include <QProcess>
#include <QFileDialog>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    
    
    ui->setupUi(this);

    setWindowTitle(tr("运行"));

    connect(ui->lineEdit, &QLineEdit::returnPressed, this, &Widget::on_EnterPushButton_clicked);
}

Widget::~Widget()
{
    
    
    delete ui;
}

void Widget::on_EnterPushButton_clicked()
{
    
    
    QProcess *myProcess = new QProcess();

    QString process = ui->lineEdit->text(); //获取要打开的应用程序
    myProcess->start(process.trimmed());     //trimmed()去掉末尾的空格

    this->close();  //关闭窗口
}

void Widget::on_CancelPushButton_2_clicked()
{
    
    
    this->close();
}

void Widget::on_BrowserPushButton_3_clicked()
{
    
    
    QString fileName = QFileDialog::getOpenFileName(this, tr("浏览"), tr("C:"), tr("程序(*exe *bat *com *cmd)"));
    ui->lineEdit->setText(fileName);
}

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实现关机操作

QProcess *myProcess = new QProcess();

QString process("C:/WINDOWS/system32/shutdown.exe");
QStringList arg;
arg << "-s";

myProcess->start(process, arg);  //启动程序