c++ - Qt Calling External Python Script

Question

I am trying to write a GUI wrapper for one of my command line tools written in Python.
It was suggested to me that I should use Qt.

Below is my project's .cpp file:

#include "v_1.h"
#include "ui_v_1.h"
#include<QtCore/QFile>
#include<QtCore/QTextStream>
#include <QProcess>
#include <QPushButton>
v_1::v_1(QWidget *parent) :
    QMainWindow(parent),ui(new Ui::v_1)
    {
        ui->setupUi(this);
    }
    v_1::~v_1()
    {
        delete ui;
    }

void v_1::on_pushButton_clicked()
{
    QProcess p;
    p.start("python script -arg1 arg1");
    p.waitForFinished(-1);
    QString p_stdout = p.readAllStandardOutput();
    ui->lineEdit->setText(p_stdout);
}

Below is my project's header file:

#ifndef V_1_H
#define V_1_H
#include <QMainWindow>
namespace Ui {
class v_1;
}

class v_1 : public QMainWindow
{
    Q_OBJECT   
public:
    explicit v_1(QWidget *parent = 0);
    ~v_1();

private slots:
    void on_pushButton_clicked();
private:
    Ui::v_1 *ui;
};

#endif // V_1_H

The UI file is just a Push Button and a LineEdit widget.

I allocated the Push Button a slot when it is clicked. The on_pushButton_clicked() method works fine when I call some utilities like ls or ps, and it pipes the output of those commands to the LineEdit widget, but when I try calling a Python script, it does not show me anything on the LineEdit widget.

Any help would be greatly appreciated.

score 1 · Accepted Answer

您是否尝试过以下方法：

确保 python 在您的系统路径中
将文档中所述的参数作为 QStringList 传递
测试时将 readAllStandardOutput 更改为 readAll

void v_1::on_pushButton_clicked() 
{
    QProcess p;
    QStringList params;

    params << "script.py -arg1 arg1";
    p.start("python", params);
    p.waitForFinished(-1);
    QString p_stdout = p.readAll();
    ui->lineEdit->setText(p_stdout);
}

score 1 · Accepted Answer

Hunor的回答也对我有用。但我没有使用进程 ID。我做了：

void MainWindow::on_pushButton_clicked()
{
   QString path = '/Somepath/mypath';
   QString  command("python");
   QStringList params = QStringList() << "script.py";

   QProcess *process = new QProcess();
   process->startDetached(command, params, path);
   process->waitForFinished();
   process->close();
}

score -1 · Accepted Answer

对我来说，下面的代码有效：

void MainWindow::on_pushButton_clicked()
{
    QString path = QCoreApplication::applicationDirPath();
    QString  command("python");
    QStringList params = QStringList() << "script.py";

    QProcess *process = new QProcess();
    process->startDetached(command, params, path, &processID);
    process->waitForFinished();
    process->close();
}

路径：您可以设置自己的路径
命令：您要在哪个程序中运行（在本例中为 python）
参数：您要执行的脚本
&processID用于在主窗口关闭时终止进程

c++ - Qt Calling External Python Script

3 回答 3

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