通过Qt GUI向CMD传递/发出命令

问题描述 投票:0回答:1

我想要实现的目标(并且正在努力)基本上是通过我的QT Mainwindow应用程序将命令传递给CMD。

我想拥有我的代码,首先运行CMD(最好隐藏)。我这里使用的QProcess是这样的:

(在我的Mainwindow.cpp文件中)

QString exePath = "C:/Windows/System32/cmd.exe";
      QProcess pro;
               pro.startDetached(exePath);
               pro.waitForStarted();

this question helped me a lot

但是,这个答案/问题缺少的是对CMD“附加”命令的实际帮助(不确定这是否是正确的术语,如果我错了请纠正我!)我已经尝试了以下这段代码

(也在我的Mainwindow.cpp文件中)

string exepathstring = "C:/Windows/System32/cmd.exe"; //because fstream doesnt accept argument of type QString
      QProcess pro;
           pro.startDetached(exePath);   //do I have to use "detached" here?
           pro.waitForFinished();   //not sure if i should use "for 
                              //finished" or "for started" or something else

      string connecttoserver = ui->lineEdit_command->text().toStdString();   //this is where people input a cmd command
                                                                             //need to convert it to to be able to append it
       fstream myoutfile(exepathstring, ios::in | ios::out | ios::app);
         myoutfile <<""<< connecttoserver << endl;

希望我可以使用正常的“追加文件”代码,但它什么都不做,我甚至没有得到错误:(

谁能告诉我哪里出错了?我怎样才能实现我的目标?

是的

  1. 启动我的“主窗口应用程序”后启动cmd(最好是隐藏)
  2. 接受用户输入,让我的应用程序在我点击按钮后将其传递给cmd。

这是我的整个mainwindow.cpp源文件

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QProcess>
#include <QString>
#include <fstream>
#include <iostream>
using namespace std;

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

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


void MainWindow::on_pushButton_clicked()
{
      QString exePath      = "C:/Windows/System32/cmd.exe";
      string exepathstring = "C:/Windows/System32/cmd.exe"; //because fstream doesnt accept argument of type QString

     QProcess pro;
              pro.startDetached(exePath); 
              pro.waitForFinished();   //not sure if i should use "for finished" or "for started" or something else

     string connecttoserver = ui->lineEdit_command->text().toStdString();   /*this is where people input a cmd command
                                                                           need to convert it to to be able to append it*/
     fstream myoutfile(exepathstring, ios::in | ios::out | ios::app);
             myoutfile <<""<< connecttoserver << endl;
    }

任何输入都会对我有很大的帮助^。^如果我使用了错误的术语,我真的很抱歉

c++ qt cmd fstream qmainwindow
1个回答
1
投票

如果你看看这个post,一个明显的问题是你使用static方法startDetached()和阻塞函数waitForFinished() ... QProcess::waitForStarted() / waitForFinished()将不会捕获来自分离QProcess的信号;因此你可以使用:

QProcess pro;
pro.start(exePath); 
pro.waitForStarted(); // the correct is `waitForStarted()`

你在fstream上尝试做什么并不清楚 - 在你的描述中,你希望用户向你的进程发送一个命令:那么这可能是:

QByteArray user_cmd = QVariant(ui->lineEdit_command->text()).toByteArray();
pro.write(user_cmd);
pro.write("\n\r"); // press Enter to execute the command

因此,您的代码可能是:

。H

#include <QProcess>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:
    void readResult();
    void on_pushButton_clicked();
private:
    Ui::MainWindow *ui;
     QProcess* pro;
};

CPP

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QString>
#include <QDebug>


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    connect(ui->pushButton, &QPushButton::clicked, this, &MainWindow::on_pushButton_clicked);
    QString exePath = "C:/Windows/System32";
    pro = new QProcess(parent);
    pro->setWorkingDirectory(exePath);
    pro->setReadChannel(QProcess::StandardOutput);
    connect(pro,&QProcess::readyReadStandardOutput, this, &MainWindow::readResult);
    pro->start("cmd.exe");
    if (!pro->waitForStarted())
    {
      qDebug() << "The process didnt start" << pro->error();
    }
}
void MainWindow::on_pushButton_clicked()
{
    if (ui->lineEdit_command->text().isEmpty())
        return;
    QByteArray cmd = QVariant(ui->lineEdit_command->text()).toByteArray();
     pro->write(cmd);
     pro->write("\n\r");
     ui->lineEdit_command->clear();

}
void MainWindow::readResult()
{
    while(pro->bytesAvailable()){
    QString dirout =  pro->readLine();
    qDebug() << dirout;
    }
}
MainWindow::~MainWindow()
{
    delete ui;
}
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