Qt(进阶2)

本篇博客参考链接

QProcess类的使用

1. 新建一个类对应一个界面，该界面将调用外部程序
2. 代码

Caesar.h

#ifndef CAESAR_H
#define CAESAR_H
#include <QProcess>
#include <QWidget>
namespace Ui {
class Caesar;
}
class Caesar : public QWidget
{
    Q_OBJECT
public:
    explicit Caesar(QWidget *parent = nullptr);
    ~Caesar();
private:
    Ui::Caesar *ui;
    QProcess *process;
    QString out;
private slots:
    void readOutput();//从进程中读取数据
    void on_encrption_button_clicked();//点击按钮触发外部程序
};
#endif // CAESAR_H

Caesar.cpp

#include "caesar.h"
#include "ui_caesar.h"
#include <QDebug>
Caesar::Caesar(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Caesar)
{
    ui->setupUi(this);
    this->process = new QProcess;
    QObject::connect(process,SIGNAL(readyRead()),this,SLOT(readOutput()));
    //准备从进程里读数据的槽
}
Caesar::~Caesar()
{
    delete ui;
}
void Caesar::on_encrption_button_clicked()
{
    QString cmd = this->ui->keyword_line->text();//获取keyword_line的内容
    QString plaintext=this->ui->plaintext_edit->toPlainText();
    cmd = "./caesar.py e "+plaintext+" "+cmd;
    qDebug()<<cmd; //相当于在终端执行命令 ./caesar e hello 5 
    //即在终端执行cmd字符串的内容
    process->start(cmd);
    out=tr("");
    ui->ciphertext_edit->setText(out);
}
void Caesar::readOutput(){
    out += process->readAll();
    qDebug()<<out;
    ui->ciphertext_edit->setText(out);
}

注：可执行文件一定要放在Qt项目对应的built文件中！！！