c++ - 检索用户选择的结果作为调用 Qt 中的外部程序的输入？

Question

我希望用户选择一个输入文件(例如 ~/MySampleTextFile.txt)，然后选择一个输出目录。我希望程序将输入文件复制到输出目录。我想知道如何访问输入文件和输出目录作为下面 on_runButton_clicked() 函数的输入？感谢您的帮助。

UI of program

主窗口.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QString>

extern std::string selected_output_dir;
using namespace std;
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    QString on_inputFileNameButton_clicked();

    void on_runButton_clicked();

    QString on_outputDirButton_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

主要.cpp:

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

主窗口.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"
# include <QFileDialog>
# include <QMessageBox>
# include <QString>
# include <QProcess>

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

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

QString MainWindow::on_inputFileNameButton_clicked()
{
    QString filename=QFileDialog::getOpenFileName(
                this,
                tr("Select file to analyze"),
                "~",
                "All files (*.*);; Text file (*.txt)"
                );
//    Qstring selected_output_dir = filename;
    QMessageBox::information(this,tr("File Name"),filename);
    return filename;
}

void MainWindow::on_runButton_clicked()
{
    QString input_file_name = "/Users/Shared/MySampleTextFile.txt";
    QMessageBox::information(this,tr("File Name"),input_file_name);
    QString output_dir = "/home/";
    QString command_to_call = "cp " + input_file_name +" " + output_dir; // copy the input_file_name to output_dir
    QProcess::execute (command_to_call);
}

QString MainWindow::on_outputDirButton_clicked()
{
    QString output_dir = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
                                                "",
                                                QFileDialog::ShowDirsOnly
                                                | QFileDialog::DontResolveSymlinks);
    QMessageBox::information(this,tr("Output directory"),output_dir);
    return output_dir;
}

主窗口.ui:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>someProgramv0.1</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QPushButton" name="runButton">
    <property name="geometry">
     <rect>
      <x>150</x>
      <y>160</y>
      <width>115</width>
      <height>32</height>
     </rect>
    </property>
    <property name="text">
     <string>Run</string>
    </property>
   </widget>
   <widget class="QLabel" name="mainProgramTitle">
    <property name="geometry">
     <rect>
      <x>130</x>
      <y>70</y>
      <width>141</width>
      <height>16</height>
     </rect>
    </property>
    <property name="text">
     <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;span style=&quot; font-size:14pt; font-weight:600; font-style:italic; color:#ff0000;&quot;&gt;SomeProgram v0.1&lt;/span&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
    </property>
   </widget>
   <widget class="QWidget" name="layoutWidget">
    <property name="geometry">
     <rect>
      <x>80</x>
      <y>130</y>
      <width>269</width>
      <height>32</height>
     </rect>
    </property>
    <layout class="QHBoxLayout" name="horizontalLayout">
     <item>
      <widget class="QPushButton" name="inputFileNameButton">
       <property name="text">
        <string>Input File</string>
       </property>
      </widget>
     </item>
     <item>
      <widget class="QPushButton" name="outputDirButton">
       <property name="text">
        <string>Output Folder</string>
       </property>
      </widget>
     </item>
    </layout>
   </widget>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>400</width>
     <height>22</height>
    </rect>
   </property>
   <widget class="QMenu" name="menu_File">
    <property name="title">
     <string>&amp;File</string>
    </property>
   </widget>
   <addaction name="menu_File"/>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

Answer 1

您可以像这样存储 filename 和 output_dir(在 MainWindow 的私有(private)部分):

主窗口.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

...

private:
    Ui::MainWindow *ui;
    QString filename_;
    Qstring output_dir_;
};

#endif // MAINWINDOW_H

然后在 on_runButton_clicked() 中像这样使用它:

主窗口.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"

...

QString MainWindow::on_inputFileNameButton_clicked()
{
    filename_ =QFileDialog::getOpenFileName(
                this,
                tr("Select file to analyze"),
                "~",
                "All files (*.*);; Text file (*.txt)"
                );
//    Qstring selected_output_dir = filename;
    QMessageBox::information(this,tr("File Name"),filename_);
    return filename;
}

void MainWindow::on_runButton_clicked()
{
    QString command_to_call = "cp " + filename_ +" " + output_dir_; // copy the input_file_name to output_dir
    QProcess::execute (command_to_call);
}

QString MainWindow::on_outputDirButton_clicked()
{
    output_dir_ = QFileDialog::getExistingDirectory(this, tr("Open Directory"),
                                                "",
                                                QFileDialog::ShowDirsOnly
                                                | QFileDialog::DontResolveSymlinks);
    QMessageBox::information(this,tr("Output directory"),output_dir);
    return output_dir;
}